SB20260912352 - Heap-based buffer overflow in Linux kernel platform x86 driver
Published: September 12, 2026
Security Bulletin ID
SB20260912352
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-89436)
CWE-ID: CWE-122 - Heap-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 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.
Remediation
Install update from vendor's website.