drm/v3d: Reject empty multisync extension to prevent infinite loop

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Summary

CVECVE-2026-46314
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-08 17:16:50 UTC
Updated2026-06-19 13:16:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/v3d: Reject empty multisync extension to prevent infinite loop v3d_get_extensions() walks a userspace-provided singly-linked list of ioctl extensions without any bound on the chain length. A local user can craft a self-referential extension (ext->next == &ext) with zero in_sync_count and out_sync_count, which bypasses the existing duplicate- extension guard: if (se->in_sync_count || se->out_sync_count) return -EINVAL; The guard never fires because v3d_get_multisync_post_deps() returns immediately when count is zero, leaving both fields at zero on every iteration. The result is an infinite loop in kernel context, blocking the calling thread and pegging a CPU core indefinitely. Fix this by rejecting a multisync extension where both in_sync_count and out_sync_count are zero in v3d_get_multisync_submit_deps(). An empty multisync carries no synchronization information and serves no useful purpose, so returning -EINVAL for such an extension is the correct defense against this attack vector.

Risk And Classification

EPSS: 0.001570000 probability, percentile 0.051690000 (date 2026-06-23)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e4165ae8304e5ea822fbe5909dd3be5445c058b7 309abbddeca0c12714721928a819ef45e5710998 git Not specified
CNA Linux Linux affected e4165ae8304e5ea822fbe5909dd3be5445c058b7 4fa42a249e8cd6ed17aea04e5695b6e9001f2433 git Not specified
CNA Linux Linux affected e4165ae8304e5ea822fbe5909dd3be5445c058b7 9c5164781cb388d219d8f49fa0f0b04cf86ad544 git Not specified
CNA Linux Linux affected e4165ae8304e5ea822fbe5909dd3be5445c058b7 fb44d589bf3148e13452185a6e772a7efbf2d684 git Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.9 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4fa42a249e8cd6ed17aea04e5695b6e9001f2433 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/309abbddeca0c12714721928a819ef45e5710998 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb44d589bf3148e13452185a6e772a7efbf2d684 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c5164781cb388d219d8f49fa0f0b04cf86ad544 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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