fuse: publish io-uring queues with release semantics

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80858
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:14 UTC
Updated2026-09-11 10:16:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fuse: publish io-uring queues with release semantics fuse_uring_create_queue() initializes a fuse_ring_queue and then publishes the pointer into ring->queues[qid] with WRITE_ONCE() under the fch->lock. There are several readers that may concurrently be fetching that pointer locklessly and then deferencing it. WRITE_ONCE() doesn't ensure ordering of the queue's field initialization before the ring->queues[qid] pointer assignment. The queue must be published with smp_store_release() so the field initialization is guaranteed to happen before. Readers in paths where the read may happen concurrently with the store need to use READ_ONCE() because any race involving a plain access is undefined.

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.040720000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 24fe962c86f55347385933a1b06ca71b60854690 a5bb215dbc34b4c6a5e144ea1416bf66450d519f git Not specified
CNA Linux Linux affected 24fe962c86f55347385933a1b06ca71b60854690 a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa git Not specified
CNA Linux Linux affected 24fe962c86f55347385933a1b06ca71b60854690 42df916e5a5f8fb4b60c8cefb54318d1ec02c580 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.3 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a5bb215dbc34b4c6a5e144ea1416bf66450d519f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42df916e5a5f8fb4b60c8cefb54318d1ec02c580 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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