Denial of service via custom VKMS vblank timer
Published Jun 8, 2026 · Updated Jun 8, 2026
Denial of service in Linux Kernel 4.19 through 6.18.33 allows local users to interrupt systems through VKMS vblank handling. The affected VKMS code keeps a custom hrtimer in struct vkms_output and dispatches expiry through handle_vblank_timeout instead of DRM's vblank timer helpers. Low-privilege local access is required; Linux has not disclosed the exact trigger, failure mode, or whether VKMS must already be enabled.
Summary
What happened
Denial of service in Linux Kernel 4.19 through 6.18.33 allows local users to interrupt systems through VKMS vblank handling. The affected VKMS code keeps a custom hrtimer in struct vkms_output and dispatches expiry through handle_vblank_timeout instead of DRM's vblank timer helpers. Low-privilege local access is required; Linux has not disclosed the exact trigger, failure mode, or whether VKMS must already be enabled.
The record
- CVE
- CVE-2025-71315
- Published
- Jun 8, 2026
- Updated
- Jun 8, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 8, 2026CVE publishedPublication date reported by the CVE source.
- Jun 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <6.18.34
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <02e2681ffe1addde1fc8c35d05657b16bfa79613
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0582cc923985c6b72fe871b5f7aa7c682bfc230
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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