SB20261022382 - Use-after-free in Linux kernel usb serial driver
Published: October 22, 2026
Security Bulletin ID
SB20261022382
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-2026-98772)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to potentially cause a denial of service through a kernel crash.
The vulnerability exists due to a use-after-free in the Linux kernel USB serial subsystem when shared USB request completion handlers race with port teardown. A local user can potentially trigger this race during device disconnection, causing a completion handler to access freed port driver data and crash the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b
- https://git.kernel.org/stable/c/5e8980a81af195c49084be5b4c031085b56c7443
- https://git.kernel.org/stable/c/60cc9379c3e650d1ebfba4de63f1242537a62a32
- https://git.kernel.org/stable/c/e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c
- https://git.kernel.org/stable/c/e80ee74206f260eb1282e7d1339ff146a4a410d0