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A potential deadlock vulnerability was identified and fixed in the Linux kernel's drm/vgem-fence subsystem. The issue involved unsafe locking scenarios related to timer deletion in IRQ context without proper safeguards, which could cause system instability. The vulnerability was demonstrated during specific Intel DRM continuous integration tests. Multiple Linux Azure kernel versions prior to specific 5.15.x updates are affected. A patch is available to address this issue.

The Linux kernel's drm/vgem-fence component had a potential deadlock vulnerability caused by improper handling of a timer that expires a vgem fence after 10 seconds. The timer was released using timer_delete_sync() from fence->ops.release() during the last dma_fence_put() call. In some cases, this release could occur in IRQ context without the TIMER_IRQSAFE flag, leading to unsafe locking and potential deadlocks. This was observed in Intel DRM CI trybot tests involving new IGT subtests. The issue has been resolved in patched kernel versions.

Detailed information about UBUNTU-CVE-2025-68757 affecting null linux-azure. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2025-68757 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux azure: In the Linux kernel, the following vulnerability has been resolved: drm/vgem-fence: Fix potential deadlock on release A timer that expires a vgem… (CVE-2025-68757)

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