SB20261022301 - Use-after-free in Linux kernel linux usb
Published: October 22, 2026
Security Bulletin ID
SB20261022301
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-2026-98696)
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 potentially cause a denial of service by crashing the kernel.
The vulnerability exists due to use-after-free in USB serial completion handlers when driver deregistration unbinds ports before ongoing I/O has stopped. A local privileged user can potentially trigger overlapping I/O and driver module unloading to cause completion handlers to access freed port data, which may crash the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/428d479a0d31460fbf5969ab262ccd673f1fac01
- https://git.kernel.org/stable/c/646e5b28b4fdbc1b828a2398d6ced2c1dd308a46
- https://git.kernel.org/stable/c/9b085a06a0a411b0bcdf18b61c3ebf1be1c72ffe
- https://git.kernel.org/stable/c/a1aa474768f69ea3a70da523f00f74c264cfa10e
- https://git.kernel.org/stable/c/e7ad832b1144df19cbbaaa655625c6f984e85b9f