CVE-2026-90256Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ab4eedb790cae44313759b50fe47da285e2519d5 before b495a3a9b33bc4e4613e685bf5c96c136caa22d8; from ab4eedb790cae44313759b50fe47da285e2519d5 before 2b66c83ff1751d6bd3201b3017206262ab46dc05; efc30877bd4bc85fefe98d80af60fafc86e5775e; f87271d21dd4ee83857ca11b94e7b4952749bbae; 18ab6b6078fa8191ca30a3065d57bf35d5635761; from 6.6.84 before 6.7; from 6.12.20 before 6.13; from 6.13.8 before 6.14 | CNA record |
References
- https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8
- https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.