Vulnerability-Lookup

GHSA-45QQ-4P94-JP2V

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-06-01 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: reject undecryptable rxkad response tickets

rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded.

A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes.

Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-31637"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:43Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: reject undecryptable rxkad response tickets\n\nrxkad_decrypt_ticket() decrypts the RXKAD response ticket and then\nparses the buffer as plaintext without checking whether\ncrypto_skcipher_decrypt() succeeded.\n\nA malformed RESPONSE can therefore use a non-block-aligned ticket\nlength, make the decrypt operation fail, and still drive the ticket\nparser with attacker-controlled bytes.\n\nCheck the decrypt result and abort the connection with RXKADBADTICKET\nwhen ticket decryption fails.",
  "id": "GHSA-45qq-4p94-jp2v",
  "modified": "2026-06-01T18:31:28Z",
  "published": "2026-04-24T15:32:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31637"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31637 (GCVE-0-2026-31637)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:44 – Updated: 2026-08-05 12:24

Title

rxrpc: reject undecryptable rxkad response tickets

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded. A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes. Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/252157d939d179b5d…
https://git.kernel.org/stable/c/a75b3b361dd481d94…
https://git.kernel.org/stable/c/b3a808cd0790b5075…
https://git.kernel.org/stable/c/47073aab8a3a5a7b4…
https://git.kernel.org/stable/c/a149dcae23309df9d…
https://git.kernel.org/stable/c/22f6258e7b31dba9b…
https://git.kernel.org/stable/c/58fcd1b156152613b…
https://git.kernel.org/stable/c/fe4447cd95623b1cf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 252157d939d179b5d767cb860ff8fa7f8723b67a (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < a75b3b361dd481d942c5f259a82d59718a41092c (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < b3a808cd0790b5075aaa2bc3588edf02cd71d352 (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < a149dcae23309df9de1c3b6b5d468610ef5ab7de (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60 (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 58fcd1b156152613ba00a064a129fb69507ddd7d (git) Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < fe4447cd95623b1cfacc15f280aab73a6d7340b2 (git)
Linux	Linux	Affected: 2.6.22 Unaffected: 0 , < 2.6.22 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.135 , ≤ 6.6.* (semver) Unaffected: 6.12.82 , ≤ 6.12.* (semver) Unaffected: 6.18.23 , ≤ 6.18.* (semver) Unaffected: 6.19.13 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/rxkad.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "252157d939d179b5d767cb860ff8fa7f8723b67a",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "a75b3b361dd481d942c5f259a82d59718a41092c",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "b3a808cd0790b5075aaa2bc3588edf02cd71d352",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "a149dcae23309df9de1c3b6b5d468610ef5ab7de",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "22f6258e7b31dba9bf88dce4e3ee7f0f20072e60",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "58fcd1b156152613ba00a064a129fb69507ddd7d",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            },
            {
              "lessThan": "fe4447cd95623b1cfacc15f280aab73a6d7340b2",
              "status": "affected",
              "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/rxkad.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "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": "6.6.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.82",
              "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": "5.10.258",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.135",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.82",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.23",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.13",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: reject undecryptable rxkad response tickets\n\nrxkad_decrypt_ticket() decrypts the RXKAD response ticket and then\nparses the buffer as plaintext without checking whether\ncrypto_skcipher_decrypt() succeeded.\n\nA malformed RESPONSE can therefore use a non-block-aligned ticket\nlength, make the decrypt operation fail, and still drive the ticket\nparser with attacker-controlled bytes.\n\nCheck the decrypt result and abort the connection with RXKADBADTICKET\nwhen ticket decryption fails."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable path is reached by remote RxRPC RESPONSE packets over UDP to a listening AF_RXRPC service connection.\nAC:L - An attacker can initiate the connection, receive the server challenge, and craft a non-block-aligned ticket plus matching response using an attacker-chosen session key; no race or uncontrolled condition is required.\nPR:N - The flaw is in the authentication handshake before client credentials are validated, so a network attacker needs no prior privileges or valid rxkad ticket.\nUI:N - Exploitation only requires sending protocol packets to the service; no victim user action is needed.\nS:U - The impact remains within the kernel/RxRPC service security authority and does not cross a VM, IOMMU, or similar security boundary.\nC:H - The bug can bypass rxkad authentication and let an unauthenticated peer access data exposed by a protected RxRPC service in the highest reasonable deployment.\nI:H - A forged authenticated connection can issue arbitrary service RPCs and choose/downgrade the connection security level, enabling unauthorized modification of protected service state.\nA:H - In a severe RxRPC service deployment, the same authentication bypass can be used to invoke destructive or service-disrupting authenticated operations repeatedly over the network."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:24:01.829Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352"
        },
        {
          "url": "https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de"
        },
        {
          "url": "https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60"
        },
        {
          "url": "https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2"
        }
      ],
      "title": "rxrpc: reject undecryptable rxkad response tickets",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31637",
    "datePublished": "2026-04-24T14:44:51.364Z",
    "dateReserved": "2026-03-09T15:48:24.125Z",
    "dateUpdated": "2026-08-05T12:24:01.829Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-45QQ-4P94-JP2V

CVE-2026-31637 (GCVE-0-2026-31637)

Tags

Sightings

Nomenclature

Related by attack behaviour