CVE-2026-31499: Linux kernel · Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:19 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da, d008460de352e534f6721de829b093368564ec66, 6.14 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available in Linux kernel versions 6.14, 6.12.88, 6.7, and related commits. Users and administrators should update to these fixed versions to remediate the deadlock issue.
Description
A deadlock vulnerability was identified and fixed in the Linux kernel's Bluetooth L2CAP component. The issue occurs in the l2cap_conn_del() function, which improperly cancels delayed work while holding a lock, potentially causing an AB-BA deadlock. The fix involves reordering work cancellations and using disable_delayed_work_sync() to prevent rearming of canceled work.
References
- git.kernel.org/stable/c/f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da (opens in a new tab)
- git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7 (opens in a new tab)
- git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66 (opens in a new tab)
- git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608 (opens in a new tab)