CVE-2026-23461Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user
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: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to conn->users. However, l2cap_register_user() and l2cap_unregister_user() don't use conn->lock, creating a race condition where these functions can access conn->users and conn->hchan concurrently with l2cap_conn_del(). This can lead to use-after-free and list corruption bugs, as reported by syzbot. Fix this by changing l2cap_register_user() and l2cap_unregister_user() to use conn->lock instead of hci_dev_lock(), ensuring consistent locking for the l2cap_conn structure.
- 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
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from efc30877bd4bc85fefe98d80af60fafc86e5775e before 11a87dd5df428a4b79a84d2790cac7f3c73f1f0d; from f87271d21dd4ee83857ca11b94e7b4952749bbae before c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf; from ab4eedb790cae44313759b50fe47da285e2519d5 before da3000cbe4851458a22be38bb18c0689c39fdd5f; from ab4eedb790cae44313759b50fe47da285e2519d5 before 71030f3b3015a412133a805ff47970cdcf30c2b8; from ab4eedb790cae44313759b50fe47da285e2519d5 before 752a6c9596dd25efd6978a73ff21f3b592668f4a; 18ab6b6078fa8191ca30a3065d57bf35d5635761; from 6.6.84 before 6.6.130; from 6.12.20 before 6.12.78; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 6.6.84 before 6.6.130; from 6.12.20 before 6.12.78; from 6.13.8 before 6.14; from 6.14.1 before 6.18.20; from 6.19 before 6.19.10; 6.14; 6.14; 6.14; and 7 more ranges | NVD |
References
- https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0dpatch
- https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abfpatch
- https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5fpatch
- https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8patch
- https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4apatch
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.