CVE-2026-53071

Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp

State: Published
Severity: 8.8 High
Published: Jun 24, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp

l2cap_ecred_reconf_rsp() calls l2cap_chan_del() without holding l2cap_chan_lock(). Every other l2cap_chan_del() caller in the file acquires the lock first. A remote BLE device can send a crafted L2CAP ECRED reconfiguration response to corrupt the channel list while another thread is iterating it.

Add l2cap_chan_hold() and l2cap_chan_lock() before l2cap_chan_del(), and l2cap_chan_unlock() and l2cap_chan_put() after, matching the pattern used in l2cap_ecred_conn_rsp() and l2cap_conn_del().

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.5 High	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	redhat-SADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	15f02b91056253e8cdc592888f431da0731337b8 to before 96dca51715d86559ed6ed8028e5445cecb80f3aeAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 330b20ec97916961ee0e6c29c06bc0fa7c96e64cAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 0ccd75c51f620374086f359e906917676e699a1cAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 77a853aec710b2fdf41fa298ea3cbc9a4358f917Affected 15f02b91056253e8cdc592888f431da0731337b8 to before fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14Affected 15f02b91056253e8cdc592888f431da0731337b8 to before dc89961b76f12aff47124c1df4bdb32a080f4d0cAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 5501d055a1ce3c747141e3955ba8cf034d193f3eAffected 15f02b91056253e8cdc592888f431da0731337b8 to before 42776497cdbc9a665b384a6dcb85f0d4bd927eabAffected
LinuxLinux	5.7Affected before 5.7Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.141 through 6.6.Not affected 6.12.91 through 6.12.Not affected 6.18.33 through 6.18.Not affected 7.0.10 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

15f02b91056253e8cdc592888f431da0731337b8 to before 96dca51715d86559ed6ed8028e5445cecb80f3aeAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 330b20ec97916961ee0e6c29c06bc0fa7c96e64cAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 0ccd75c51f620374086f359e906917676e699a1cAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 77a853aec710b2fdf41fa298ea3cbc9a4358f917Affected
15f02b91056253e8cdc592888f431da0731337b8 to before fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14Affected
15f02b91056253e8cdc592888f431da0731337b8 to before dc89961b76f12aff47124c1df4bdb32a080f4d0cAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 5501d055a1ce3c747141e3955ba8cf034d193f3eAffected
15f02b91056253e8cdc592888f431da0731337b8 to before 42776497cdbc9a665b384a6dcb85f0d4bd927eabAffected

LinuxLinux

5.7Affected
before 5.7Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.141 through 6.6.*Not affected
6.12.91 through 6.12.*Not affected
6.18.33 through 6.18.*Not affected
7.0.10 through 7.0.*Not affected
7.1 and laterNot affected

References

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