# CVE-2026-31499: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

Status: published. Published: 2026-04-22. Updated: 2026-11-05.

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().

## Remediation

No remediation reported in collected sources

## Affected products and versions

- 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). Source: 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). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.09% as of 2026-11-05; percentile 0.59%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da (CNA: Linux)

- https://git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7 (CNA: Linux)

- https://git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66 (CNA: Linux)

- https://git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-31499; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-31499; retrieved 2026-11-05; source updated Not reported

Revision: 5c28fb6b3419d1cb4068e8de0c21059f0f3930d5b30ab9fcd32f2f3918ee6ec8

Canonical: https://y2.dev/cve/CVE-2026-31499

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