CVE-2026-43033 (GCVE-0-2026-43033)
Vulnerability from cvelistv5
Published
2026-05-01 14:15
Modified
2026-10-19 19:06
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption When decrypting data that is not in-place (src != dst), there is no need to save the high-order sequence bits in dst as it could simply be re-copied from the source. However, the data to be hashed need to be rearranged accordingly. Thanks,
References
Impacted products
Vendor Product Version
Linux Linux Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
Version: 104880a6b470958ddc30e139c41aa4f6ed3a5234
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.7",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.7",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.7",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.7",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.7",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T01:18:46.503Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
          }
        ],
        "x_adpType": "supplier"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-43033",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T15:13:46.097130Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-682",
                "description": "CWE-682 Incorrect Calculation",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T19:06:10.536Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "crypto/authencesn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8c62f618576519dbed6816fafc623ce592953025",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "d589abd8b019b07075fda255ceab8c8e950cdb3f",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "d0c4ff6812386880f30bc64c2921299cc4d7b47f",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "89fe118b6470119b20c04afc36e45b81a69ea11f",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "153d5520c3f9fd62e71c7e7f9e34b59cf411e555",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "cded4002d22177e8deaca1f257ecd932c9582b6b",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            },
            {
              "lessThan": "e02494114ebf7c8b42777c6cd6982f113bfdbec7",
              "status": "affected",
              "version": "104880a6b470958ddc30e139c41aa4f6ed3a5234",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "crypto/authencesn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.254",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.204",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.170",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.137",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.85",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.254",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.204",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.170",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.137",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.85",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption\n\nWhen decrypting data that is not in-place (src != dst), there is\nno need to save the high-order sequence bits in dst as it could\nsimply be re-copied from the source.\n\nHowever, the data to be hashed need to be rearranged accordingly.\n\n\nThanks,"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable out-of-place AEAD decrypt path is reachable by a local process through AF_ALG sockets using authencesn, while normal inbound ESP uses in-place src==dst. This requires local syscall access rather than remote packets directly reaching the bad branch.\nAC:L - The attacker controls the AF_ALG request buffers, associated-data length, operation type, key, and authsize, and no race or hard-to-influence state is required. The fault occurs before ICV verification, so a valid packet/tag is not needed.\nPR:L - AF_ALG socket creation, bind, key setup, and AEAD decrypt do not require CAP_NET_ADMIN or CAP_SYS_ADMIN, but the attacker needs local unprivileged code execution. XFRM state management is privileged, but the lower-privilege AF_ALG path reaches the bug.\nUI:N - No victim action is required once the local attacker runs the AF_ALG syscall sequence. The attacker supplies both input and output buffers directly.\nS:U - The vulnerability is in kernel crypto processing and impacts the same kernel security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bug is a kernel memory-corruption condition from writing ESN high sequence bytes past the intended out-of-place destination; successful exploitation of such corruption could expose arbitrary kernel memory. Under the required uncertainty rule, this is scored as high confidentiality impact.\nI:H - The vulnerable code performs an attacker-influenced out-of-bounds write of four bytes before authentication succeeds. Kernel out-of-bounds writes are scored as high integrity impact because they can plausibly be shaped into control-flow or data corruption.\nA:H - At minimum, the AF_ALG path can drive scatterwalk past the end of the destination scatterlist and crash the kernel. A local attacker can repeat the trigger without authentication, causing high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:26.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8c62f618576519dbed6816fafc623ce592953025"
        },
        {
          "url": "https://git.kernel.org/stable/c/d589abd8b019b07075fda255ceab8c8e950cdb3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0c4ff6812386880f30bc64c2921299cc4d7b47f"
        },
        {
          "url": "https://git.kernel.org/stable/c/89fe118b6470119b20c04afc36e45b81a69ea11f"
        },
        {
          "url": "https://git.kernel.org/stable/c/153d5520c3f9fd62e71c7e7f9e34b59cf411e555"
        },
        {
          "url": "https://git.kernel.org/stable/c/cded4002d22177e8deaca1f257ecd932c9582b6b"
        },
        {
          "url": "https://git.kernel.org/stable/c/e02494114ebf7c8b42777c6cd6982f113bfdbec7"
        }
      ],
      "title": "crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43033",
    "datePublished": "2026-05-01T14:15:32.583Z",
    "dateReserved": "2026-05-01T14:12:55.977Z",
    "dateUpdated": "2026-10-19T19:06:10.536Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-457936.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:18:46.503Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-43033\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:13:46.097130Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-682\", \"description\": \"CWE-682 Incorrect Calculation\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:13:46.664Z\"}}], \"cna\": {\"title\": \"crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable out-of-place AEAD decrypt path is reachable by a local process through AF_ALG sockets using authencesn, while normal inbound ESP uses in-place src==dst. This requires local syscall access rather than remote packets directly reaching the bad branch.\\nAC:L - The attacker controls the AF_ALG request buffers, associated-data length, operation type, key, and authsize, and no race or hard-to-influence state is required. The fault occurs before ICV verification, so a valid packet/tag is not needed.\\nPR:L - AF_ALG socket creation, bind, key setup, and AEAD decrypt do not require CAP_NET_ADMIN or CAP_SYS_ADMIN, but the attacker needs local unprivileged code execution. XFRM state management is privileged, but the lower-privilege AF_ALG path reaches the bug.\\nUI:N - No victim action is required once the local attacker runs the AF_ALG syscall sequence. The attacker supplies both input and output buffers directly.\\nS:U - The vulnerability is in kernel crypto processing and impacts the same kernel security authority. It does not cross a VM, IOMMU, or other separate security boundary.\\nC:H - The bug is a kernel memory-corruption condition from writing ESN high sequence bytes past the intended out-of-place destination; successful exploitation of such corruption could expose arbitrary kernel memory. Under the required uncertainty rule, this is scored as high confidentiality impact.\\nI:H - The vulnerable code performs an attacker-influenced out-of-bounds write of four bytes before authentication succeeds. Kernel out-of-bounds writes are scored as high integrity impact because they can plausibly be shaped into control-flow or data corruption.\\nA:H - At minimum, the AF_ALG path can drive scatterwalk past the end of the destination scatterlist and crash the kernel. A local attacker can repeat the trigger without authentication, causing high availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"8c62f618576519dbed6816fafc623ce592953025\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"d589abd8b019b07075fda255ceab8c8e950cdb3f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"d0c4ff6812386880f30bc64c2921299cc4d7b47f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"89fe118b6470119b20c04afc36e45b81a69ea11f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"153d5520c3f9fd62e71c7e7f9e34b59cf411e555\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"cded4002d22177e8deaca1f257ecd932c9582b6b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"104880a6b470958ddc30e139c41aa4f6ed3a5234\", \"lessThan\": \"e02494114ebf7c8b42777c6cd6982f113bfdbec7\", \"versionType\": \"git\"}], \"programFiles\": [\"crypto/authencesn.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.254\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.204\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.170\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.137\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"crypto/authencesn.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8c62f618576519dbed6816fafc623ce592953025\"}, {\"url\": \"https://git.kernel.org/stable/c/d589abd8b019b07075fda255ceab8c8e950cdb3f\"}, {\"url\": \"https://git.kernel.org/stable/c/5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5\"}, {\"url\": \"https://git.kernel.org/stable/c/d0c4ff6812386880f30bc64c2921299cc4d7b47f\"}, {\"url\": \"https://git.kernel.org/stable/c/89fe118b6470119b20c04afc36e45b81a69ea11f\"}, {\"url\": \"https://git.kernel.org/stable/c/153d5520c3f9fd62e71c7e7f9e34b59cf411e555\"}, {\"url\": \"https://git.kernel.org/stable/c/cded4002d22177e8deaca1f257ecd932c9582b6b\"}, {\"url\": \"https://git.kernel.org/stable/c/e02494114ebf7c8b42777c6cd6982f113bfdbec7\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption\\n\\nWhen decrypting data that is not in-place (src != dst), there is\\nno need to save the high-order sequence bits in dst as it could\\nsimply be re-copied from the source.\\n\\nHowever, the data to be hashed need to be rearranged accordingly.\\n\\n\\nThanks,\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.254\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.204\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.170\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.137\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.85\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.22\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.12\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"4.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:25:26.050Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43033\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:06:10.536Z\", \"dateReserved\": \"2026-05-01T14:12:55.977Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-01T14:15:32.583Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.