CVE-2026-31629 (GCVE-0-2026-31629)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:43
VLAI
Title
nfc: llcp: add missing return after LLCP_CLOSED checks
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED checks In nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket state is LLCP_CLOSED, the code correctly calls release_sock() and nfc_llcp_sock_put() but fails to return. Execution falls through to the remainder of the function, which calls release_sock() and nfc_llcp_sock_put() again. This results in a double release_sock() and a refcount underflow via double nfc_llcp_sock_put(), leading to a use-after-free. Add the missing return statements after the LLCP_CLOSED branches in both functions to prevent the fall-through.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < b2a23529593d011fb433a3d711fc597ed6a6bd2f (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 665315df9c3486cb213fc44d83cc8bcd47fe0d26 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 0eb1263a3b8c36418c9ba295c9ab3abed664edbf (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 796e0cac058252d0ad34ebe288e6f7979b5fc9b2 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 8977fad2b3c6eefd414131168d597c5d1d5e1abf (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < ff3d9e8f7244293e303f7b6ef70774291c7c27e9 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < aba4712e8f0381cd5d196534ce2ad082626a5ab6 (git)
Affected: d646960f7986fefb460a2b062d5ccc8ccfeacc3a , < 2b5dd4632966c39da6ba74dbc8689b309065e82c (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (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: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (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.