Heap-based buffer overflow in Linux kernel - CVE-2026-89436
Published: September 12, 2026
Vulnerability identifier: #VU149374
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-2026-89436
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to write beyond allocated memory.
The vulnerability exists due to a heap-based buffer overflow in the pcc->sinf array in acpi_pcc_retrieve_biosdata() when processing ACPI HKEY.SINF data whose package count equals the allocated array length. A local user can cause the driver to process such data to write beyond allocated memory.
Affected software
Linux kernel
How to mitigate CVE-2026-89436
Install security update from vendor's repository.