Out-of-bounds read in Linux kernel - CVE-2026-89443
Published: September 12, 2026
Vulnerability identifier: #VU149371
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89443
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform out-of-bounds reads.
The vulnerability exists due to an out-of-bounds read in the ISST perf mask ioctl handlers when processing user-supplied ioctl input containing an invalid performance level. A local user can submit a crafted ioctl request with an invalid level value to perform out-of-bounds reads.
Affected software
Linux kernel
How to mitigate CVE-2026-89443
Install security update from vendor's repository.