Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected efc30877bd4bc85fefe98d80af60fafc86e5775e before 11a87dd5df428a4b79a84d2790cac7f3c73f1f0d; affected f87271d21dd4ee83857ca11b94e7b4952749bbae before c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf; affected ab4eedb790cae44313759b50fe47da285e2519d5 before da3000cbe4851458a22be38bb18c0689c39fdd5f; affected ab4eedb790cae44313759b50fe47da285e2519d5 before 71030f3b3015a412133a805ff47970cdcf30c2b8; affected ab4eedb790cae44313759b50fe47da285e2519d5 before 752a6c9596dd25efd6978a73ff21f3b592668f4a; affected 18ab6b6078fa8191ca30a3065d57bf35d5635761; affected 6.6.84 before 6.6.130; affected 6.12.20 before 6.12.78; affected 6.13.8 before 6.14 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.6.130 through 6.6.*; unaffected 6.12.78 through 6.12.*; unaffected 6.18.20 through 6.18.*; unaffected 6.19.10 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d
- https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf
- https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f
- https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8
- https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a
ADP enrichment
No English description supplied.
No references supplied.