Race condition in Linux kernel - CVE-2026-80895
Published: September 5, 2026
Vulnerability identifier: #VU147026
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80895
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause use of partially initialized virtual processor fields.
The vulnerability exists due to improper synchronization in the MSHV pt_vp_array publication path when an irqfd fast-path assertion races concurrent virtual processor creation. A local user can register an irqfd targeting an as-yet-uncreated virtual processor and trigger the fast path concurrently with its creation to cause use of partially initialized virtual processor fields.
The condition can occur on weakly ordered architectures, where a non-NULL array pointer may become visible before virtual processor initialization stores.
Affected software
Linux kernel
How to mitigate CVE-2026-80895
Install security update from vendor's repository.