drm/virtio: fix dma_fence refcount leak on error in virtio_gpu_dma_fence_wait()

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Summary

CVECVE-2026-53190
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:36 UTC
Updated2026-06-25 09:16:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/virtio: fix dma_fence refcount leak on error in virtio_gpu_dma_fence_wait() dma_fence_unwrap_for_each() internally calls dma_fence_unwrap_first() which does cursor->chain = dma_fence_get(head), taking an extra reference. On normal loop completion, dma_fence_unwrap_next() releases this via dma_fence_chain_walk() -> dma_fence_put(). When virtio_gpu_do_fence_wait() fails and the function returns early from inside the loop, the cursor->chain reference is never released. This is the only caller in the entire kernel that does an early return inside dma_fence_unwrap_for_each. Add dma_fence_put(itr.chain) before the early return.

Risk And Classification

EPSS: 0.001750000 probability, percentile 0.072010000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eba57fb5498f2858768321e64570caea188455b8 898bd0ccfed71651b881660c5d20ad73b5203174 git Not specified
CNA Linux Linux affected eba57fb5498f2858768321e64570caea188455b8 73524e9f96a278b521f257a78a845c49eb522bc1 git Not specified
CNA Linux Linux affected eba57fb5498f2858768321e64570caea188455b8 8348567a6afb24e2c9cafe8a321162d0eebe1411 git Not specified
CNA Linux Linux affected eba57fb5498f2858768321e64570caea188455b8 c0fffc874c264292e769f26194a2a5e66ce31810 git Not specified
CNA Linux Linux affected eba57fb5498f2858768321e64570caea188455b8 3f26bb732cc136ab20176697c92f32c9c84cb125 git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/898bd0ccfed71651b881660c5d20ad73b5203174 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/73524e9f96a278b521f257a78a845c49eb522bc1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8348567a6afb24e2c9cafe8a321162d0eebe1411 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0fffc874c264292e769f26194a2a5e66ce31810 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f26bb732cc136ab20176697c92f32c9c84cb125 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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