Improper locking in Linux kernel - CVE-2026-64098
Published: July 20, 2026
Vulnerability identifier: #VU138545
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64098
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock handling in virtio_gpu_cursor_plane_update() and virtio_gpu_resource_flush() when updating planes and flushing framebuffer resources. A local user can trigger error conditions that leave the dma_resv lock unheld and then reach fence-list updates to cause a denial of service.
The issue can race with concurrent readers or writers and corrupt the dma_resv fence list. The reported trigger used fault injection on the DRM_IOCTL_MODE_CURSOR path.
How to mitigate CVE-2026-64098
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/21ab64c77a30d56efc506c8fa2ad8959f8ce3d36
- https://git.kernel.org/stable/c/7930eee22cd3df61e85be8aa512032ab303b7167
- https://git.kernel.org/stable/c/8fadd01cf461fee5bb11506621339c548447e5c7
- https://git.kernel.org/stable/c/9af1b6e175c82daf4b423da339a722d8e67a735a
- https://git.kernel.org/stable/c/a2359a411b15f495d12cfda6a7db6855ebb7f90f
- https://git.kernel.org/stable/c/c86077d512ee980cc91322211d35dbcd3175f64c