Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-31499: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.09% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 00fdebbbc557a2fc21321ff2eaa22fd70c078608, 3f26ecbd9cde621dd94be7ef252c7210b965a5c7, 6.12.88; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 00fdebbbc557a2fc21321ff2eaa22fd70c078608, 3f26ecbd9cde621dd94be7ef252c7210b965a5c7, 6.12.88; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 22, 2026
Updated
Jun 17, 2026
EPSS
0.0% · 0th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-31499

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.6.84 and later · before 6.7
  • linux linux kernel6.12.20 and later · before 6.13
  • linux linux kernel6.13.8 and later · before 6.14
  • linux linux kernel6.14.1 and later · before 6.18.21
  • linux linux kernel6.19 and later · before 6.19.11
  • linux linux kernel6.14
  • linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • efc30877bd4bc85fefe98d80af60fafc86e5775e, 18ab6b6078fa8191ca30a3065d57bf35d5635761, 6.14affected
    • f87271d21dd4ee83857ca11b94e7b4952749bbae and later · before f7f35a4f7fd574f5889bb2e4b397e14cbb83f6daaffected · git
    • ab4eedb790cae44313759b50fe47da285e2519d5 and later · before 3f26ecbd9cde621dd94be7ef252c7210b965a5c7affected · git
    • ab4eedb790cae44313759b50fe47da285e2519d5 and later · before d008460de352e534f6721de829b093368564ec66affected · git
    • ab4eedb790cae44313759b50fe47da285e2519d5 and later · before 00fdebbbc557a2fc21321ff2eaa22fd70c078608affected · git
    • 6.12.20 and later · before 6.12.88affected · semver
    • 6.6.84 and later · before 6.7affected · semver
    • 6.13.8 and later · before 6.14affected · semver
    • before 6.14not affected · semver
    • 6.12.88 and later · up to and including 6.12.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.88-16.12.88-1
Debian:14linuxbefore 6.19.11-16.19.11-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.36.1.160000.2.176.12.0-160000.36.1.160000.2.17
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.36.16.12.0-160000.36.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.36.16.12.0-160000.36.1
SUSE:Linux Enterprise Live Patching 12 SP5kernel-defaultbefore 4.12.14-122.320.14.12.14-122.320.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_85before 1-8.3.11-8.3.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_17before 1-150700.15.3.11-150700.15.3.1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_17before 1-150700.1.3.11-150700.1.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.63.1.150700.17.37.16.4.0-150700.53.63.1.150700.17.37.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1

+25

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31497Apr 22, 2026 · Bluetooth: btusb: clamp SCO altsetting table indices
    22Monitor
  • ← EarlierCVE-2026-31498Apr 22, 2026 · Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop
    22Monitor
  • Later →CVE-2026-31509Apr 22, 2026 · nfc: nci: fix circular locking dependency in nci_close_device
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux00fdebbbc557a2fc21321ff2eaa22fd70c078608Vendor (CNA)
Linux Linux3f26ecbd9cde621dd94be7ef252c7210b965a5c7Vendor (CNA)
Linux Linux6.12.88Vendor (CNA)
Linux Linux6.14Vendor (CNA)
Linux Linux6.7Vendor (CNA)
Linux Linuxd008460de352e534f6721de829b093368564ec66Vendor (CNA)
Linux Linuxf7f35a4f7fd574f5889bb2e4b397e14cbb83f6daVendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.88-1 · Debian:13Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-azure6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.36.1.160000.2.17 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.36.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.36.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.36.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-48.1.21.25 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-docs6.12.0-160000.36.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.36.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.36.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

+4

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-667 · Improper Locking

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records