Bug 2396431 (CVE-2022-50386) - CVE-2022-50386 kernel: Bluetooth: L2CAP: Fix user-after-free
Summary: CVE-2022-50386 kernel: Bluetooth: L2CAP: Fix user-after-free
Keywords:
Status: NEW
Alias: CVE-2022-50386
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-09-18 14:04 UTC by OSIDB Bzimport
Modified: 2025-09-24 23:41 UTC (History)
0 users

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2025-09-18 14:04:46 UTC 
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
Comment 1 Keith Grant 2025-09-18 15:21:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091852-CVE-2022-50386-07d7@gregkh/T
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