CVE-2026-5165: Virtio-win: virtio-win: memory corruption via use-after-free in virtio blk device reset

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-30 · updated 2026-06-17
Weakness: CWE-825

Description

A flaw was found in virtio-win, specifically within the VirtIO Block (BLK) device. When the device undergoes a reset, it fails to properly manage memory, resulting in a use-after-free vulnerability. This issue could allow a local attacker to corrupt system memory, potentially leading to system instability or unexpected behavior.

Affected products

Red Hat Enterprise Linux: 9.0, 10.0
RedHat Virtio-Win: all versions

References

https://access.redhat.com/security/cve/CVE-2026-5165
https://bugzilla.redhat.com/show_bug.cgi?id=2453015
https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1493

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