Improper handling of exceptional conditions in Linux kernel - CVE-2026-64290
Published: July 27, 2026
Vulnerability identifier: #VU139702
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-64290
CWE-ID: CWE-755
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper exception handling in iommufd_fault_fops_read() when handling a copy_to_user() failure while reading fault events. A local user can trigger a failing read operation to cause a denial of service.
The issue can lead to an infinite retry loop that spins the reader at 100% CPU while holding fault->mutex.
Affected software
Linux kernel
How to mitigate CVE-2026-64290
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3