Incorrect calculation in Linux kernel - CVE-2026-89961
Published: September 17, 2026
Vulnerability identifier: #VU150327
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89961
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89961
Install security update from vendor's repository.
External 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