CVE-2026-46243 (GCVE-0-2026-46243)
Vulnerability from cvelistv5
Published
2026-06-01 16:22
Modified
2026-06-14 18:05
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.
References
Impacted products
Vendor Product Version
Linux Linux Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
Version: f1d662a7d5e5322e583aad6b3cfec03d8f27b435
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-46243",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-01T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-20",
                "description": "CWE-20 Improper Input Validation",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-02T03:56:00.563Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/manizada/CIFSwitch"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-06-01T18:55:00.540Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/01/6"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifs_spnego.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7713bd320ed4fc3d08a227cd8e41242219a16981",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "9544559e59438a4b609b2fdfa0763d8360572824",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "cf20038657d6d4974349556a34e08fe0490bebbc",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "2035acfb17221729b1b8ac335e941868a04ca079",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "a3bbda6502a9398b816fa2e71c9a3f955f58013d",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "91f89c1d83e80417629791fcef6af8140d7d01c8",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "0aece6685fc80a8de492688ca2315fb86ec379c7",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            },
            {
              "lessThan": "3da1fdf4efbc490041eb4f836bf596201203f8f2",
              "status": "affected",
              "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifs_spnego.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:05:20.395Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981"
        },
        {
          "url": "https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d"
        },
        {
          "url": "https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2"
        }
      ],
      "title": "smb: client: reject userspace cifs.spnego descriptions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46243",
    "datePublished": "2026-06-01T16:22:29.211Z",
    "dateReserved": "2026-05-13T15:03:33.107Z",
    "dateUpdated": "2026-06-14T18:05:20.395Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/06/01/6\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-06-01T18:55:00.540Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-46243\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-01T17:52:03.133770Z\"}}}], \"references\": [{\"url\": \"https://github.com/manizada/CIFSwitch\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-01T17:50:56.636Z\"}}], \"cna\": {\"title\": \"smb: client: reject userspace cifs.spnego descriptions\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"7713bd320ed4fc3d08a227cd8e41242219a16981\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"9544559e59438a4b609b2fdfa0763d8360572824\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"cf20038657d6d4974349556a34e08fe0490bebbc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"2035acfb17221729b1b8ac335e941868a04ca079\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"a3bbda6502a9398b816fa2e71c9a3f955f58013d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"91f89c1d83e80417629791fcef6af8140d7d01c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"0aece6685fc80a8de492688ca2315fb86ec379c7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f1d662a7d5e5322e583aad6b3cfec03d8f27b435\", \"lessThan\": \"3da1fdf4efbc490041eb4f836bf596201203f8f2\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/smb/client/cifs_spnego.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.24\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.24\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.142\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.92\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/smb/client/cifs_spnego.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981\"}, {\"url\": \"https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824\"}, {\"url\": \"https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc\"}, {\"url\": \"https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079\"}, {\"url\": \"https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d\"}, {\"url\": \"https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8\"}, {\"url\": \"https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7\"}, {\"url\": \"https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: reject userspace cifs.spnego descriptions\\n\\ncifs.spnego key descriptions contain authority-bearing fields such as\\npid, uid, creduid, and upcall_target that cifs.upcall treats as\\nkernel-originating inputs. However, userspace can also create keys of\\nthis type through request_key(2) or add_key(2), allowing those fields to\\nbe supplied without CIFS origin.\\n\\nOnly accept cifs.spnego descriptions while CIFS is using its private\\nspnego_cred to request the key.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.142\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.92\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.34\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.11\", \"versionStartIncluding\": \"2.6.24\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"2.6.24\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-06-14T18:05:20.395Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46243\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-14T18:05:20.395Z\", \"dateReserved\": \"2026-05-13T15:03:33.107Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-01T16:22:29.211Z\", \"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.