Improper locking in Linux kernel - CVE-2026-80633
Published: August 28, 2026
Vulnerability identifier: #VU146165
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80633
CWE-ID: CWE-667
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 locking in iopt_release_pages() when releasing the last reference on a DMABUF-backed iopt_pages during iommufd_ioas_destroy() or iommufd_ioas_unmap(). A local user can trigger these operations to cause a denial of service.
The issue triggers a kernel WARN when dma_buf_unpin() is called without holding the exporter's dma_resv lock.
Affected software
Linux kernel
How to mitigate CVE-2026-80633
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3