SB20260720133 - Improper locking in Linux kernel drm virtio driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260720133

SB20260720133 - Improper locking in Linux kernel drm virtio driver

Published: July 20, 2026

Security Bulletin ID SB20260720133
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-64098)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References