CVE-2024-35786: drm/nouveau: fix stale locked mutex in nouveau_gem_ioctl_pushbuf
In the Linux kernel, the following vulnerability has been resolved:
drm/nouveau: fix stale locked mutex in nouveau_gem_ioctl_pushbuf
If VM_BIND is enabled on the client the legacy submission ioctl can't be
used, however if a client tries to do so regardless it will return an
error. In this case the clients mutex remained unlocked leading to a
deadlock inside nouveau_drm_postclose or any other nouveau ioctl call.
Security readout for executives and security teams
Plain-English summary
This Linux kernel issue affects the nouveau DRM component. A client using VM_BIND could trigger an error path in a legacy submission ioctl that leaves mutex handling in a bad state, causing later close or ioctl operations to deadlock. The business impact appears to be availability, not data theft, based on the supplied sources.
Executive priority
Treat this as a moderate availability issue. It is not presented as remotely exploitable or actively exploited, but affected Linux GPU workloads could hang driver operations. Patch through normal kernel maintenance, with higher priority for systems relying on nouveau.
Technical view
CVE-2024-35786 is a resolved Linux kernel nouveau bug in nouveau_gem_ioctl_pushbuf. When VM_BIND is enabled, legacy submission ioctl use should fail, but the failure path left client mutex state stale, leading to deadlock in nouveau_drm_postclose or later nouveau ioctl calls. Stable kernel commits are listed as references.
Likely exposure
Exposure is most likely on Linux systems running affected kernel versions with the nouveau DRM driver path in use. The source lists Linux kernel 6.6-era affected data and stable commit references, but does not provide distribution package names or complete platform details.
Exploitation context
The supplied bundle does not show active exploitation, public exploit code, or CISA KEV listing. The described trigger requires a local client interaction with nouveau ioctl behavior, so available evidence points to local denial-of-service risk rather than remote compromise.
Researcher notes
Evidence is limited to the CVE text and kernel stable references. The affected-version data is not distro-specific and appears branch-oriented. Validate against the actual kernel tree or vendor advisory before declaring exposure or non-exposure.
Mitigation direction
Apply Linux kernel updates containing the referenced stable fixes.
Check distribution advisories for backported fixes to your deployed kernel packages.
Prioritize systems using nouveau DRM functionality or affected kernel branches.
If no vendor package is available, follow vendor kernel mitigation guidance.
Validation and detection
Inventory Linux kernel versions across relevant systems.
Identify hosts using the nouveau DRM component.
Compare deployed kernels against vendor advisories and referenced stable commits.
Confirm update status through distribution package metadata.
Monitor for recurring nouveau-related deadlocks or GPU driver hangs.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
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CVE-2024-35786 mapping review
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