CVE-2026-53071 | Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp

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().

Published: 2026-06-24 Last update: 2026-07-21 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-53071 is rated Moderate Risk (41.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.27%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-53071

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-09 0.15% 0.27% +0.12%
2 2026-06-30 0.16% 0.15% -0.02%
3 2026-06-25 — 0.16% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-53071

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 416baaa9-dc9f-4396-8d5f-8c081fb06d67
7.5 3.1 HIGH
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 5.9 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Weakness enumeration for CVE-2026-53071

GitHub Security Advisory for CVE-2026-53071

GHSA-g7cw-xhg8-933g · Severity: high — In the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: Add...

OS Trackers for CVE-2026-53071

vendor priority summary link
debian not yet assigned CVE-2026-53071 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2026-53071
redhat high — https://access.redhat.com/security/cve/CVE-2026-53071
suse high CVE-2026-53071 severity important: SUSE including 20 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 99 product×package rows across 23 product lines (SUSE Linux Enterprise High Availability Extension 15 SP7, SUSE Linux Enterprise Live Patching 12 SP5, … (23 product lines)): Known Not Affected 99. https://www.suse.com/security/cve/CVE-2026-53071/
ubuntu high CVE-2026-53071 high priority: Ubuntu including 162 source packages (linux, linux-allwinner-5.19, …), 1458 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1051, ignored 172, released 88, needed 52, pending 49, not-affected 45, needs-triage 1. https://ubuntu.com/security/CVE-2026-53071

Affected software / configurations for CVE-2026-53071

Vendor Product Version Raw CPE
linux linux_kernel >= 5.7, < 5.10.258 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.209 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.175 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.6.141 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.7, < 6.12.91 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.13, < 6.18.33 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.19, < 7.0.10 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

References for CVE-2026-53071

URL Tags
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/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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