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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:44 – Updated: 2026-04-27 14:04
VLAI?
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
References
Impacted products
Vendor Product Version
Linux Linux Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < a149dcae23309df9de1c3b6b5d468610ef5ab7de (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60 (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < 58fcd1b156152613ba00a064a129fb69507ddd7d (git)
Affected: 17926a79320afa9b95df6b977b40cca6d8713cea , < fe4447cd95623b1cfacc15f280aab73a6d7340b2 (git)
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    Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (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)
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Detection rules are retrieved from Rulezet.