CVE-2026-5165 Virtio-win: virtio-win: memory corruption via use-after-free in virtio blk device reset
A local attacker can trigger a use-after-free in the VirtIO Block device reset, causing system memory corruption and instability.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5165?
CVE-2026-5165 is a medium-severity use after free vulnerability in Redhat Enterprise Linux, published on 30 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-825
Which versions are affected by CVE-2026-5165?
It affects 2 products.
Products include Redhat Enterprise Linux, Redhat Virtio-Win.
How do I fix CVE-2026-5165?
No fix has been published for CVE-2026-5165 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-5165 being exploited?
There is no known exploitation of CVE-2026-5165 in the wild and no public exploit code.
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Sources
Also known as GHSA-6fw6-rqjg-9v3j.