Improper privilege management in Linux kernel - CVE-2026-97931
Published: September 28, 2026
Vulnerability identifier: #VU152540
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-97931
CWE-ID: CWE-269
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to improper memory mapping permission handling in the ALSA us122l hwdep mmap callback when using mprotect() on a read-buffer mapping after opening the hwdep node O_RDWR. A local user can upgrade the read-buffer mapping to writable and modify the read_size member to cause memory corruption.
The read VMA remains expandable because pcm_usb_stream uses mremap() after reading read_size.
Affected software
Linux kernel
How to mitigate CVE-2026-97931
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3