CVE-2026-53190

Summary

In 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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/898bd0ccfed71651b881660c5d20ad73b5203174
• https://git.kernel.org/stable/c/73524e9f96a278b521f257a78a845c49eb522bc1
• https://git.kernel.org/stable/c/8348567a6afb24e2c9cafe8a321162d0eebe1411
• https://git.kernel.org/stable/c/c0fffc874c264292e769f26194a2a5e66ce31810
• https://git.kernel.org/stable/c/3f26bb732cc136ab20176697c92f32c9c84cb125

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