drm/vc4: Use managed KMS polling to fix UAF on unbind

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Summary

CVECVE-2026-98309
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:22 UTC
Updated2026-10-19 10:18:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vc4: Use managed KMS polling to fix UAF on unbind vc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides no matching drm_kms_helper_poll_fini(). The output poll work stays scheduled after unbind and runs on the freed drm_device: # modprobe vc4; rmmod vc4; sleep 10 BUG: KASAN: slab-use-after-free in delayed_work_timer_fn BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm] Workqueue: events output_poll_execute [drm_kms_helper] Allocated by task 171: __devm_drm_dev_alloc Freed by task 262 (rmmod): drm_dev_put / component_del Use drmm_kms_helper_poll_init() so polling is finalized with the device, as other drivers do.

Risk And Classification

EPSS: 0.001750000 probability, percentile 0.063840000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c8b75bca92cbf064b9fa125fc74a85994452e935 b6beee927e7f4e3142032ff91b2d0417cdddc0f6 git Not specified
CNA Linux Linux affected c8b75bca92cbf064b9fa125fc74a85994452e935 cf0c4432bda37b02e7d430ff5017228ceb7caf0c git Not specified
CNA Linux Linux affected c8b75bca92cbf064b9fa125fc74a85994452e935 ee507691c18f9fee5d4751e295ab9a7ff31d59ae git Not specified
CNA Linux Linux affected c8b75bca92cbf064b9fa125fc74a85994452e935 7f9780df677370a19b4ec9764f13b1b82073e0d9 git Not specified
CNA Linux Linux affected c8b75bca92cbf064b9fa125fc74a85994452e935 073a30d75f309812ed61af134f24ffef4107b13a git Not specified
CNA Linux Linux affected 4.4 Not specified
CNA Linux Linux unaffected 4.4 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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