SB20261022455 - Use-after-free in Linux kernel usb caiaq
Published: October 22, 2026
Security Bulletin ID
SB20261022455
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-2026-98837)
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 by triggering access to freed kernel memory.
The vulnerability exists due to use-after-free in the Linux kernel ALSA caiaq driver when device probing fails after an input device has been registered. A local user can read the input device's "uevent" attribute after this failure to trigger a dereference of freed device state, potentially causing a kernel crash.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0b7bd20f6379bc5e431fd74d866390f5b5b63f3c
- https://git.kernel.org/stable/c/2e5a413cc2a489c9427ecd3d73ad764bfb0c7103
- https://git.kernel.org/stable/c/84727facd8506140cd04f2b0a8b1c4ddeac41cea
- https://git.kernel.org/stable/c/850810c12686f80cdf7530f4f21e0157d904f739
- https://git.kernel.org/stable/c/df2787819bd137111b56b8631dd581b0cce7144d