Stack-based buffer overflow in Linux kernel - CVE-2026-89587
Published: September 12, 2026
Vulnerability identifier: #VU149212
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89587
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt stack memory.
The vulnerability exists due to a stack-based buffer overflow in the query_capability() function when processing firmware _DSM buffer objects. A local user can invoke the PFRU ioctl while firmware returns oversized _DSM buffers to corrupt stack memory.
The affected capability-information structure is stack-allocated in pfru_ioctl().
Affected software
Linux kernel
How to mitigate CVE-2026-89587
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3