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().
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.4% (30-day exploitation probability)+5
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
- Apply the fixed version or the patch documented under Remediation.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
≥ 15f02b91056253e8cdc592888f431da0731337b8 and < 96dca51715d86559ed6ed8028e5445cecb80f3ae≥ 15f02b91056253e8cdc592888f431da0731337b8 and < 330b20ec97916961ee0e6c29c06bc0fa7c96e64c≥ 15f02b91056253e8cdc592888f431da0731337b8 and < 0ccd75c51f620374086f359e906917676e699a1c≥ 15f02b91056253e8cdc592888f431da0731337b8 and < 77a853aec710b2fdf41fa298ea3cbc9a4358f917≥ 15f02b91056253e8cdc592888f431da0731337b8 and < fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14≥ 15f02b91056253e8cdc592888f431da0731337b8 and < dc89961b76f12aff47124c1df4bdb32a080f4d0c≥ 15f02b91056253e8cdc592888f431da0731337b8 and < 5501d055a1ce3c747141e3955ba8cf034d193f3e≥ 15f02b91056253e8cdc592888f431da0731337b8 and < 42776497cdbc9a665b384a6dcb85f0d4bd927eab and 1 moreversion 5.7 |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel | ≥ 5.7 and < 5.10.258≥ 5.11 and < 5.15.209≥ 5.16 and < 6.1.175≥ 6.2 and < 6.6.141≥ 6.7 and < 6.12.91≥ 6.13 and < 6.18.33≥ 6.19 and < 7.0.10 | Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 8.8 | CVSS 3.1 | High | 2.8 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database |
| 8.8 | CVSS 3.1 | High | — | — | Linux via CVE Program (cve.org) e CISA ADP |
| 7.5 | CVSS 3.1 | High | 1.6 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c via NIST National Vulnerability Database |
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 0.43%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Not enough vector or weakness data: use the affected application’s logs as a starting point.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- Record published
- Fix documented
- CVSS changed · 8.8
- Source status changed · → Modified
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
19 on the record
- git.kernel.org/stable/c/330b20ec97916961ee0e6c29c06bc0fa7c96e64c
- git.kernel.org/stable/c/5501d055a1ce3c747141e3955ba8cf034d193f3e
- git.kernel.org/stable/c/fe1188abdae9b7a8199dcdfcf9244d5e5d61eb14
- git.kernel.org/stable/c/dc89961b76f12aff47124c1df4bdb32a080f4d0c
- git.kernel.org/stable/c/77a853aec710b2fdf41fa298ea3cbc9a4358f917
- git.kernel.org/stable/c/42776497cdbc9a665b384a6dcb85f0d4bd927eab
- git.kernel.org/stable/c/0ccd75c51f620374086f359e906917676e699a1c
- git.kernel.org/stable/c/96dca51715d86559ed6ed8028e5445cecb80f3ae
- access.redhat.com/errata/RHSA-2026:65710
- access.redhat.com/errata/RHSA-2026:42919
- access.redhat.com/security/cve/CVE-2026-53071
- access.redhat.com/errata/RHSA-2026:42550
- bugzilla.redhat.com/show_bug.cgi
- access.redhat.com/errata/RHSA-2026:67721
- access.redhat.com/errata/RHSA-2026:67723
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53071.json
- access.redhat.com/errata/RHSA-2026:42552
- access.redhat.com/errata/RHSA-2026:43307
- access.redhat.com/errata/RHSA-2026:65711
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 1d
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 1d
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
- Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-53071 is "Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. EPSS 0.43% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
Comments
Moderated technical discussion. Read the community guidelines.
No comments yet.
Sign in or create an account to comment and suggest corrections.