CVE-2026-31499
Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
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().
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ f87271d21dd4ee83857ca11b94e7b4952749bbae; < f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da (affected, git) ≥ ab4eedb790cae44313759b50fe47da285e2519d5; < 3f26ecbd9cde621dd94be7ef252c7210b965a5c7 (affected, git) ≥ ab4eedb790cae44313759b50fe47da285e2519d5; < d008460de352e534f6721de829b093368564ec66 (affected, git) ≥ ab4eedb790cae44313759b50fe47da285e2519d5; < 00fdebbbc557a2fc21321ff2eaa22fd70c078608 (affected, git) efc30877bd4bc85fefe98d80af60fafc86e5775e (affected, git) 18ab6b6078fa8191ca30a3065d57bf35d5635761 (affected, git) ≥ 6.12.20; < 6.12.88 (affected, semver) ≥ 6.6.84; < 6.7 (affected, semver) ≥ 6.13.8; < 6.14 (affected, semver) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
6.14 (affected) ≥ 0; < 6.14 (unaffected, semver) ≥ 6.12.88; ≤ 6.12.* (unaffected, semver) ≥ 6.18.21; ≤ 6.18.* (unaffected, semver) ≥ 6.19.11; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/f7f35a4f7fd574f5889bb2e4b397e14cbb83f6daCNA: Linux
- https://git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7CNA: Linux
- https://git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66CNA: Linux
- https://git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608CNA: Linux
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