Out-of-bounds write in Linux kernel - CVE-2026-31602
Published: April 25, 2026
Vulnerability identifier: #VU127791
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31602
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds access in ct_vm_map() in the ALSA ctxfi driver when handling large aggregate memory allocations for playback streams. A local user can trigger crafted allocation patterns through ioctl operations to cause a denial of service.
The issue is triggered on AMD64 systems when aggregate memory allocations exceed the single-page table coverage limit.
Remediation
Install security update from vendor's repository.