Improper input validation in Linux kernel - CVE-2026-80891
Published: September 5, 2026
Vulnerability identifier: #VU147022
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80891
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause unsafe pinning of guest pages.
The vulnerability exists due to improper input validation in the KVM s390 PCI adapter-interrupt facility handling when enabling the facility with crafted AIBV or AISB values. A local user can supply an AIBV that spans more than one page or a misaligned AISB address to cause unsafe pinning of guest pages.
The AISB is used when the summary-bit indicator is specified.
Affected software
Linux kernel
How to mitigate CVE-2026-80891
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47
- https://git.kernel.org/stable/c/3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48
- https://git.kernel.org/stable/c/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01
- https://git.kernel.org/stable/c/b878ba7e28144c9a857bc847d31f3c45413450ac
- https://git.kernel.org/stable/c/f00ef8efd41440129ccd88f4a1ebebf8d61d297f
- https://git.kernel.org/stable/c/fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528