CVE-2026-74306 vfio/qat: fix f_pos race in qat_vf_resume_write()
A race condition in the Linux kernel's vfio/qat driver allows concurrent writers to bypass bounds checks, potentially leading to memory corruption and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74306?
CVE-2026-74306 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
vfio/qat: fix f_pos race in qat_vf_resume_write()
qat_vf_resume_write() checks filp->f_pos before taking migf->lock, but copies into the migration-state buffer after taking the lock and re-reading the shared file position.
Two concurrent writers could therefore pass the bounds check with the old offset, then have the second writer copy after the first advanced f_pos, writing past the end of the migration-state buffer.
Take migf->lock before doing the boundary checks.
Which versions are affected by CVE-2026-74306?
How do I fix CVE-2026-74306?
Apply the vendor's patch.
Is CVE-2026-74306 being exploited?
There is no known exploitation of CVE-2026-74306 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74306, DEBIAN-CVE-2026-74306, GHSA-5q42-qm7h-h2q2, UBUNTU-CVE-2026-74306.