CVE-2026-31499 (GCVE-0-2026-31499)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-05-23 16:05
VLAI
Title
Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f87271d21dd4ee83857ca11b94e7b4952749bbae , < f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da (git)
Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < 3f26ecbd9cde621dd94be7ef252c7210b965a5c7 (git)
Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < d008460de352e534f6721de829b093368564ec66 (git)
Affected: ab4eedb790cae44313759b50fe47da285e2519d5 , < 00fdebbbc557a2fc21321ff2eaa22fd70c078608 (git)
Affected: efc30877bd4bc85fefe98d80af60fafc86e5775e (git)
Affected: 18ab6b6078fa8191ca30a3065d57bf35d5635761 (git)
Affected: 6.12.20 , < 6.12.88 (semver)
Affected: 6.6.84 , < 6.7 (semver)
Affected: 6.13.8 , < 6.14 (semver)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 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.