SB20260912190 - Stack-based buffer overflow in Linux kernel acpi driver

Description

This security bulletin contains information about 1 vulnerability.

1) Stack-based buffer overflow (CVE-ID: CVE-2026-89587)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 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]

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().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/15d2b7f38f95d28652170344f39ee492c55e567c
• https://git.kernel.org/stable/c/6d4ed2fd022bc862b156e53aae163b61259e1caa
• https://git.kernel.org/stable/c/a2151624b55029dad0ca7efd17fb83a0461c8843
• https://git.kernel.org/stable/c/ced45be0073a8a31b30b4a7f68cd3a15734515de