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
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)
Create a notification for this product.
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)
Create a notification for this product.
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    "redhat_vex": {
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      "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": "5"
    }
  }
}



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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.