CVE-2026-31631 (GCVE-0-2026-31631)
Vulnerability from cvelistv5
Published
2026-04-24 14:44
Modified
2026-10-19 18:56
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix buffer overread in rxgk_do_verify_authenticator() Fix rxgk_do_verify_authenticator() to check the buffer size before checking the nonce.
Impacted products
Vendor Product Version
Linux Linux Version: 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a
Version: 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a
Version: 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-31631",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T15:11:20.356548Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T18:56:00.756Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/rxgk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "794586789800b16dcbe235452494f4223ac80413",
              "status": "affected",
              "version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
              "versionType": "git"
            },
            {
              "lessThan": "1c4422d8be81718ecb15d79aedff607323085201",
              "status": "affected",
              "version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
              "versionType": "git"
            },
            {
              "lessThan": "f564af387c8c28238f8ebc13314c589d7ba8475d",
              "status": "affected",
              "version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/rxgk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.13",
              "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": "6.18.23",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.13",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix buffer overread in rxgk_do_verify_authenticator()\n\nFix rxgk_do_verify_authenticator() to check the buffer size before checking\nthe nonce."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - RxRPC is carried over UDP and the vulnerable server-side RXGK RESPONSE processing is reached from received network packets on an AF_RXRPC service endpoint.\nAC:L - There is no race or condition outside the attacker\u0027s control once an RXGK-capable service and enctype are in use; a crafted short decrypted authenticator deterministically reaches the missing length check.\nPR:N - The vulnerable code runs during the RXGK authentication handshake before the service connection is accepted. No local privilege on the target is required by a remote peer sending the RESPONSE packet.\nUI:N - No victim user action is required after the RxRPC service is listening; packet processing occurs in the kernel receive path.\nS:U - The impact is confined to the kernel/service host processing the RxRPC connection and does not cross a VM, IOMMU, or comparable security boundary.\nC:L - The bug is a bounded buffer overread of a few bytes past the decrypted authenticator buffer, potentially exposing adjacent kernel heap data through comparison/error behavior. It does not provide an arbitrary kernel memory read.\nI:N - The flaw is an out-of-bounds read before nonce/appdata parsing and does not write attacker-controlled data or corrupt memory.\nA:H - The out-of-bounds read can fault or trigger hardened/debug slab checks, producing a kernel oops or panic. A remote peer can repeatedly send crafted RESPONSE packets."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:23:57.537Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/794586789800b16dcbe235452494f4223ac80413"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c4422d8be81718ecb15d79aedff607323085201"
        },
        {
          "url": "https://git.kernel.org/stable/c/f564af387c8c28238f8ebc13314c589d7ba8475d"
        }
      ],
      "title": "rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31631",
    "datePublished": "2026-04-24T14:44:47.305Z",
    "dateReserved": "2026-03-09T15:48:24.125Z",
    "dateUpdated": "2026-10-19T18:56:00.756Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-31631\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:11:20.356548Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:11:20.912Z\"}}], \"cna\": {\"title\": \"rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.2, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - RxRPC is carried over UDP and the vulnerable server-side RXGK RESPONSE processing is reached from received network packets on an AF_RXRPC service endpoint.\\nAC:L - There is no race or condition outside the attacker\u0027s control once an RXGK-capable service and enctype are in use; a crafted short decrypted authenticator deterministically reaches the missing length check.\\nPR:N - The vulnerable code runs during the RXGK authentication handshake before the service connection is accepted. No local privilege on the target is required by a remote peer sending the RESPONSE packet.\\nUI:N - No victim user action is required after the RxRPC service is listening; packet processing occurs in the kernel receive path.\\nS:U - The impact is confined to the kernel/service host processing the RxRPC connection and does not cross a VM, IOMMU, or comparable security boundary.\\nC:L - The bug is a bounded buffer overread of a few bytes past the decrypted authenticator buffer, potentially exposing adjacent kernel heap data through comparison/error behavior. It does not provide an arbitrary kernel memory read.\\nI:N - The flaw is an out-of-bounds read before nonce/appdata parsing and does not write attacker-controlled data or corrupt memory.\\nA:H - The out-of-bounds read can fault or trigger hardened/debug slab checks, producing a kernel oops or panic. A remote peer can repeatedly send crafted RESPONSE packets.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a\", \"lessThan\": \"794586789800b16dcbe235452494f4223ac80413\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a\", \"lessThan\": \"1c4422d8be81718ecb15d79aedff607323085201\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a\", \"lessThan\": \"f564af387c8c28238f8ebc13314c589d7ba8475d\", \"versionType\": \"git\"}], \"programFiles\": [\"net/rxrpc/rxgk.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.18.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/rxrpc/rxgk.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/794586789800b16dcbe235452494f4223ac80413\"}, {\"url\": \"https://git.kernel.org/stable/c/1c4422d8be81718ecb15d79aedff607323085201\"}, {\"url\": \"https://git.kernel.org/stable/c/f564af387c8c28238f8ebc13314c589d7ba8475d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrxrpc: Fix buffer overread in rxgk_do_verify_authenticator()\\n\\nFix rxgk_do_verify_authenticator() to check the buffer size before checking\\nthe nonce.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.23\", \"versionStartIncluding\": \"6.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.13\", \"versionStartIncluding\": \"6.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"6.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:23:57.537Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31631\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:56:00.756Z\", \"dateReserved\": \"2026-03-09T15:48:24.125Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-24T14:44:47.305Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.


Loading…

Loading…