CVE-2026-31499Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
- 5.5MediumCVSS base score
- 0.09%Exploitation in 30 daysEPSS · top 99% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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().
Timeline
ID reserved
By Linux
- 44 days later
· 44 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.09% · top 99% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected f87271d21dd4ee83857ca11b94e7b4952749bbae – < f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da
- affected ab4eedb790cae44313759b50fe47da285e2519d5 – < 3f26ecbd9cde621dd94be7ef252c7210b965a5c7
- affected ab4eedb790cae44313759b50fe47da285e2519d5 – < d008460de352e534f6721de829b093368564ec66
- affected ab4eedb790cae44313759b50fe47da285e2519d5 – < 00fdebbbc557a2fc21321ff2eaa22fd70c078608
- affected efc30877bd4bc85fefe98d80af60fafc86e5775e
- affected 18ab6b6078fa8191ca30a3065d57bf35d5635761
- affected 6.12.20 – < 6.12.88
- affected 6.6.84 – < 6.7
- affected 6.13.8 – < 6.14
- affected 6.14
- unaffected < 6.14
- unaffected 6.12.88 – ≤ 6.12.*
- unaffected 6.18.21 – ≤ 6.18.*
- unaffected 6.19.11 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References4
- https://git.kernel.org/stable/c/f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da (opens in a new tab)
- https://git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7 (opens in a new tab)
- https://git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66 (opens in a new tab)
- https://git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-24875 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-31499)Record last updated .