rxrpc: reject undecryptable rxkad response tickets
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.
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