CVE-2026-90256Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
- 8.8HighCVSS base score
- 0.32%Exploitation in 30 daysEPSS · top 75% 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: use proto_lock for l2cap_data to fix l2cap_disconn_ind hci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via hci_conn_timeout (disc_work) -> hci_proto_disconn_ind -> l2cap_disconn_ind. This is UAF if the l2cap_conn is deleted concurrently. disc_work is disabled sync in hci_conn_del(), so we cannot take hci_dev_lock in disc_work. Fix by using proto_lock to guard l2cap_data, in addition to hdev->lock which is held in other access paths.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 34 days later
· 34 days 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.32% · top 75% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected efc30877bd4bc85fefe98d80af60fafc86e5775e – < 0fa448369c87e20b2aeaeaca0187d698dd61f791
- affected f87271d21dd4ee83857ca11b94e7b4952749bbae – < 7c032b6d48a46634cbd58aaebad2638c00ad3b51
- affected ab4eedb790cae44313759b50fe47da285e2519d5 – < b495a3a9b33bc4e4613e685bf5c96c136caa22d8
- affected ab4eedb790cae44313759b50fe47da285e2519d5 – < 2b66c83ff1751d6bd3201b3017206262ab46dc05
- affected 18ab6b6078fa8191ca30a3065d57bf35d5635761
- affected 6.6.84 – < 6.6.160
- affected 6.12.20 – < 6.12.114
- affected 6.13.8 – < 6.14
- affected 6.14
- unaffected < 6.14
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/0fa448369c87e20b2aeaeaca0187d698dd61f791 (opens in a new tab)
- https://git.kernel.org/stable/c/7c032b6d48a46634cbd58aaebad2638c00ad3b51 (opens in a new tab)
- https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8 (opens in a new tab)
- https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05 (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-2026-81849 (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-2026-90256)Record last updated .