CVE-2022-50386: Bluetooth: L2CAP: Fix user-after-free

Severity: high (CVSS 8.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-18 · updated 2026-08-04
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix user-after-free This uses l2cap_chan_hold_unless_zero() after calling __l2cap_get_chan_blah() to prevent the following trace: Bluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref *kref) Bluetooth: chan 0000000023c4974d Bluetooth: parent 00000000ae861c08 ================================================================== BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:191 [inline] BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:671 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x278/0x400 kernel/locking/mutex.c:729 Read of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389

Affected products

Linux kernel: before 4.9.331; from 4.10 before 4.14.296; from 4.15 before 4.19.262; from 4.20 before 5.4.220; from 5.5 before 5.10.150; from 5.11 before 5.15.75 — fixed in 4.14.296, 4.19.262, 4.9.331, 5.10.150, 5.15.75, 5.19.17

How to fix

Upgrade to a fixed version: Linux kernel 4.14.296, 4.19.262, 4.9.331, 5.10.150. Check the vendor advisory for mitigations.

References

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