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rxrpc: reject undecryptable rxkad response tickets

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-31637

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31637

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "252157d939d179b5d767cb860ff8fa7f8723b67a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "a75b3b361dd481d942c5f259a82d59718a41092c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "b3a808cd0790b5075aaa2bc3588edf02cd71d352",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "a149dcae23309df9de1c3b6b5d468610ef5ab7de",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "22f6258e7b31dba9bf88dce4e3ee7f0f20072e60",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "58fcd1b156152613ba00a064a129fb69507ddd7d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "17926a79320afa9b95df6b977b40cca6d8713cea",
        "lessThan": "fe4447cd95623b1cfacc15f280aab73a6d7340b2",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/rxrpc/rxkad.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.22"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.22",
        "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": "6.6.135",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.82",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "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/rxkad.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31637

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#39933 · Revision 1
Added to Heist Feed
Publisher date
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