CVE-2026-63948: Linux kernel · Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 16:18 UTC
Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 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 30 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Linux Linux | Affected
| Fixed in– |
AI-suggested
A fix for this vulnerability is available in the specified Linux kernel versions. Users should update to these fixed versions to remediate the issue. No additional mitigation is required beyond applying the official patch.
Description
A reference leak vulnerability in the Linux kernel's Bluetooth L2CAP implementation was fixed. The flaw involved a missing reference release in the l2cap_chan_timeout() function when the channel's connection pointer was NULL, causing a reference leak. This was addressed by adding the missing l2cap_chan_put() call before the early return in the function.
References
- git.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee (opens in a new tab)
- git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060 (opens in a new tab)
- git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f (opens in a new tab)
- git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1 (opens in a new tab)
- git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f (opens in a new tab)
- git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b (opens in a new tab)
- git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd (opens in a new tab)
- git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939 (opens in a new tab)