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.
References
Configurations
Configuration 1 (hide)
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History
20 May 2026, 15:30
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d - Patch | |
| References | () https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8 - Patch | |
| References | () https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a - Patch | |
| References | () https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf - Patch | |
| References | () https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f - Patch | |
| CWE | CWE-416 | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
27 Apr 2026, 14:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.8 |
03 Apr 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-03 16:16
Updated : 2026-05-20 15:30
NVD link : CVE-2026-23461
Mitre link : CVE-2026-23461
CVE.ORG link : CVE-2026-23461
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free