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CVE-2026-31696 (GCVE-0-2026-31696)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:55 – Updated: 2026-06-14 17:43
VLAI
Title
rxrpc: Fix missing validation of ticket length in non-XDR key preparsing
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix missing validation of ticket length in non-XDR key preparsing In rxrpc_preparse(), there are two paths for parsing key payloads: the XDR path (for large payloads) and the non-XDR path (for payloads <= 28 bytes). While the XDR path (rxrpc_preparse_xdr_rxkad()) correctly validates the ticket length against AFSTOKEN_RK_TIX_MAX, the non-XDR path fails to do so. This allows an unprivileged user to provide a very large ticket length. When this key is later read via rxrpc_read(), the total token size (toksize) calculation results in a value that exceeds AFSTOKEN_LENGTH_MAX, triggering a WARN_ON(). [ 2001.302904] WARNING: CPU: 2 PID: 2108 at net/rxrpc/key.c:778 rxrpc_read+0x109/0x5c0 [rxrpc] Fix this by adding a check in the non-XDR parsing path of rxrpc_preparse() to ensure the ticket length does not exceed AFSTOKEN_RK_TIX_MAX, bringing it into parity with the XDR parsing logic.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < 44714dfda386884919ba366411880b6fb3c3efd3 (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < 41a117dd80371343babc52198d1114e83eb37627 (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < 9a397aa9b5e53ca63d4d6aefb542832eca389618 (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < 1fa36cf495b0023e8475d038535c05e4063211e1 (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < 4458757c020592a3094366e0fb20457383b42f92 (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < ce383ba615339f8eaec646a166d2c2b015bb5ca0 (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < a1be1c9ece26cea69654f28b255ff9a7906b897b (git)
Affected: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 , < ac33733b10b484d666f97688561670afd5861383 (git)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31696",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31696.json",
      "version": "6"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


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.