Out-of-bounds write in Linux kernel - CVE-2026-64293
Published: July 27, 2026
Vulnerability identifier: #VU139679
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64293
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to overwrite memory in a user-supplied buffer.
The vulnerability exists due to an out-of-bounds write in iommufd_veventq_fops_read() when reading normal vEVENT records. A local user can trigger the function with a crafted buffer size and event data length to overwrite memory in a user-supplied buffer.
This affects 32-bit systems because the bounds check uses the size of a pointer instead of the full header size.
Affected software
Linux kernel
How to mitigate CVE-2026-64293
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3