Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-63948
Published: July 20, 2026
Vulnerability identifier: #VU138701
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63948
CWE-ID: CWE-772
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a reference leak in l2cap_chan_timeout() in the Bluetooth L2CAP subsystem when handling a channel timeout with a null connection pointer. A local user can trigger this condition to cause a denial of service.
How to mitigate CVE-2026-63948
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd
- https://git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f
- https://git.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee
- https://git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1
- https://git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f
- https://git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939
- https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060
- https://git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b