SB20261022345 - Use-after-free in Linux kernel bluetooth
Published: October 22, 2026
Security Bulletin ID
SB20261022345
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-98738)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service through a kernel crash.
The vulnerability exists due to use-after-free in the Linux kernel Bluetooth build_pairing_cmd() function when accessing remote out-of-band (OOB) data during pairing. A local privileged user can trigger concurrent pairing and remote OOB data removal operations to cause the function to access a freed list entry, potentially crashing the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1e11412a1b9854a89d044576d616675b16141d87
- https://git.kernel.org/stable/c/81a2345f1984f0b36d3226571bc196316a01b648
- https://git.kernel.org/stable/c/889c61e3d0f1091a958e4b2a24b20bab23d915c4
- https://git.kernel.org/stable/c/94afa17d6bfd5c1d367c56c8b63df5f695380861
- https://git.kernel.org/stable/c/df5162eeb10e69fe0c2349503882c4a09077f001