misc: fastrpc: Remove buffer from list prior to unmap operation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74647
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:38 UTC
Updated2026-08-22 16:16:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Remove buffer from list prior to unmap operation fastrpc_req_munmap_impl() is called to unmap any buffer. The buffer is getting removed from the list after it is unmapped from DSP. This can create potential race conditions if multiple threads invoke unmap concurrently, where one thread may remove the entry from the list while another thread's unmap operation is still ongoing. Fix this by removing the buffer entry from the list before calling the unmap operation. If the unmap fails, the entry is re-added to the list so that userspace can retry the unmap, or alternatively, the buffer will be cleaned up during device release when the DSP process is torn down and all DSP-side mappings are freed along with remaining buffers in the list.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2419e55e532de14fdf336e09e453aa2831c73a25 97273624f7b356eaf8261609a75cfcb8738a165a git Not specified
CNA Linux Linux affected 2419e55e532de14fdf336e09e453aa2831c73a25 fe70329055977fc1e8dc6291318d0dd75470795a git Not specified
CNA Linux Linux affected 2419e55e532de14fdf336e09e453aa2831c73a25 9bf22a7d950cec2d1efeca7f16bb20fcca84c36a git Not specified
CNA Linux Linux affected 2419e55e532de14fdf336e09e453aa2831c73a25 0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5 git Not specified
CNA Linux Linux affected 2419e55e532de14fdf336e09e453aa2831c73a25 6102ceb4eab845743ee57acd3863fbd06e93c927 git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/97273624f7b356eaf8261609a75cfcb8738a165a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe70329055977fc1e8dc6291318d0dd75470795a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6102ceb4eab845743ee57acd3863fbd06e93c927 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9bf22a7d950cec2d1efeca7f16bb20fcca84c36a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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