SB20260816137 - Race condition in Linux kernel kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74568)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the KVM arm64 VGIC LPI handling logic when releasing and re-registering LPIs with the same INTID concurrently. A local user can trigger concurrent DISCARD and MAPTI operations to cause a denial of service.

The issue occurs in the direct release and deferred release paths and can result in deletion of a newly registered LPI or leakage of an orphaned LPI.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/292e80a159aa88635bf668a7212cfdf526b8bd52
• https://git.kernel.org/stable/c/cbfe2b24a1ea9de35032dbdd100fdc700f5be92d