usb: gadget: f_fs: Fix DMA fence leak

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64328
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:14 UTC
Updated2026-07-25 10:17:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix DMA fence leak In ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the underlying dma_fence later initialized by dma_fence_init(), which sets its kref counter to 1. Then, dma_resv_add_fence() gets a second reference, and a pointer to the ffs_dma_fence is passed as the usb_request's "context" field. The dma-resv mechanism will manage the second reference, but the first reference is never properly released; the ffs_dmabuf_cleanup() function decreases the reference count, but only to balance with the reference grab in ffs_dmabuf_signal_done(). The code will then slowly leak memory as more ffs_dma_fence objects are created without being ever freed. Address this issue by transferring ownership of the fence to the DMA reservation object, by calling dma_fence_put() right after dma_resv_add_fence(). The ffs_dma_fence then gets properly discarded after being signalled.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101470000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 b7475b2dce5e121e687280ba5732ccefe77ffd2f git Not specified
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 e086c16962a1b0142e2675610e9c06fcfcd4c3a8 git Not specified
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 0cae3d6109427c455bad0a18dfb3e2a91657e38a git Not specified
CNA Linux Linux affected 7b07a2a7ca02a20124b552be96c5a56910795488 baa6b6068a3f2bf2ed525a1cb37975905dadc658 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e086c16962a1b0142e2675610e9c06fcfcd4c3a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b7475b2dce5e121e687280ba5732ccefe77ffd2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0cae3d6109427c455bad0a18dfb3e2a91657e38a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/baa6b6068a3f2bf2ed525a1cb37975905dadc658 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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