SB2026091705 - Incorrect calculation in Linux kernel mm book3s64
Published: September 17, 2026
Security Bulletin ID
SB2026091705
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect calculation (CVE-ID: CVE-2026-89961)
CWE-ID: CWE-682 - Incorrect Calculation
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to incorrect calculation of PFN offsets in vmemmap_populate_compound_pages() when populating compound-page vmemmap mappings. A local user can trigger compound-page vmemmap population to compromise confidentiality, integrity, and availability.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/7968852a7ca3ce81477ec5b4494a28d612f35a97
- https://git.kernel.org/stable/c/89a4ae32764172468dea303eb6ae90fe6c859712
- https://git.kernel.org/stable/c/9c914b7a0bd18834505c65f22225ce22c152b2d9
- https://git.kernel.org/stable/c/b96be860673f9fbbf12cdadb0b25fc4d6d4d207f
- https://git.kernel.org/stable/c/e163c7184acf36ac20a248498f4a16016057ca01