CVE-2026-53071

Summary

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().

Impact & exploitability

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0ccd75c51f620374086f359e906917676e699a1c ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0ccd75c51f620374086f359e906917676e699a1cPatch
• https://git.kernel.org/stable/c/330b20ec97916961ee0e6c29c06bc0fa7c96e64cPatch
• https://git.kernel.org/stable/c/42776497cdbc9a665b384a6dcb85f0d4bd927eabPatch
• https://git.kernel.org/stable/c/5501d055a1ce3c747141e3955ba8cf034d193f3ePatch
• https://git.kernel.org/stable/c/77a853aec710b2fdf41fa298ea3cbc9a4358f917Patch
• https://git.kernel.org/stable/c/96dca51715d86559ed6ed8028e5445cecb80f3aePatch
• https://git.kernel.org/stable/c/dc89961b76f12aff47124c1df4bdb32a080f4d0cPatch
• https://git.kernel.org/stable/c/fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14Patch