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Vulnerability record · CVE-2026-53071 · published 24 June 2026

CVE-2026-53071: Linux kernel use after free vulnerability

Linux · Linux Kernel

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().

8.8 CVSS 3.1 High EPSS 0.43% · top 65.3% CWE-667 · CWE-667CWE-416 · Use after free
8.8CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
19References
16 Sep 2026Last modified by NVD

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().

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0ccd75c51f620374086f359e906917676e699a1c Patch
https://git.kernel.org/stable/c/330b20ec97916961ee0e6c29c06bc0fa7c96e64c Patch
https://git.kernel.org/stable/c/42776497cdbc9a665b384a6dcb85f0d4bd927eab Patch
https://git.kernel.org/stable/c/5501d055a1ce3c747141e3955ba8cf034d193f3e Patch
https://git.kernel.org/stable/c/77a853aec710b2fdf41fa298ea3cbc9a4358f917 Patch
https://git.kernel.org/stable/c/96dca51715d86559ed6ed8028e5445cecb80f3ae Patch
https://git.kernel.org/stable/c/dc89961b76f12aff47124c1df4bdb32a080f4d0c Patch
https://git.kernel.org/stable/c/fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14 Patch
https://access.redhat.com/errata/RHSA-2026:42550 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:42552 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:42919
https://access.redhat.com/errata/RHSA-2026:43307
https://access.redhat.com/errata/RHSA-2026:65710
https://access.redhat.com/errata/RHSA-2026:65711
https://access.redhat.com/errata/RHSA-2026:67721
https://access.redhat.com/errata/RHSA-2026:67723
https://access.redhat.com/security/cve/CVE-2026-53071 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492458 Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53071.json Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-53071), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.