CVE-2024-36944

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

Reapply "drm/qxl: simplify qxl_fence_wait"

This reverts commit 07ed11afb68d94eadd4ffc082b97c2331307c5ea.

Stephen Rostedt reports:

"I went to run my tests on my VMs and the tests hung on boot up.

Unfortunately, the most I ever got out was:

[ 93.607888] Testing event system initcall: OK

[ 93.667730] Running tests on all trace events:

[ 93.669757] Testing all events: OK

[ 95.631064] ------------[ cut here ]------------

Timed out after 60 seconds"

and further debugging points to a possible circular locking dependency

between the console_owner locking and the worker pool locking.

Reverting the commit allows Steve's VM to boot to completion again.

[ This may obviously result in the "[TTM] Buffer eviction failed"

messages again, which was the reason for that original revert. But at

this point this seems preferable to a non-booting system... ]

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References