vfio/pci: Fix double free in dma-buf feature

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Summary

CVECVE-2026-31468
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:43 UTC
Updated2026-04-22 14:16:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vfio/pci: Fix double free in dma-buf feature The error path through vfio_pci_core_feature_dma_buf() ignores its own advice to only use dma_buf_put() after dma_buf_export(), instead falling through the entire unwind chain. In the unlikely event that we encounter file descriptor exhaustion, this can result in an unbalanced refcount on the vfio device and double free of allocated objects. Avoid this by moving the "put" directly into the error path and return the errno rather than entering the unwind chain.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5d74781ebc86c5fa9e9d6934024c505412de9b52 83ad334afc9a645cef1062f5346526b1e36d6516 git Not specified
CNA Linux Linux affected 5d74781ebc86c5fa9e9d6934024c505412de9b52 e98137f0a874ab36d0946de4707aa48cb7137d1c git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e98137f0a874ab36d0946de4707aa48cb7137d1c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83ad334afc9a645cef1062f5346526b1e36d6516 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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