fuse-uring: fix race between registration and connection abortion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68095
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:19:53 UTC
Updated2026-08-17 05:18:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fuse-uring: fix race between registration and connection abortion This fixes this race: - thread a: io_uring_enter -> register sqe -> fuse_uring_create_ring_ent -> allocate ent but doesn't grab queue_ref yet - thread b: fuse_conn_destroy() -> fuse_chan_abort() -> fuse_uring_abort() is a no-op due to queue ref being 0 - thread a: grabs the queue_ref, queue_ref is now 1, rest of fuse_uring_do_register() logic executes - thread b: fuse_chan_abort() returns, fuse_chan_wait_aborted() now runs and calls "wait_event(ring->stop_waitq, atomic_read(&ring->queue_refs) == 0);" The abort/unmount thread will hang indefinitely in unkillable state as nothing will decrement queue_refs or wake stop_waitq, and the ring, queue, and ent are leaked. Fix this by checking fch->connected under fch->lock after the created ent has grabbed a ref count on the queue. This ensures that in the scenario above, it is guaranteed that we either release the queue ref and wake up stop_waitq (in case fuse_chan_wait_aborted() is already waiting) in fuse_uring_do_register() when we detect !fch->connected, or if the connection is aborted after the check, it is guaranteed that the async teardown worker will be running in the background cleaning up ents and decrementing the ent's ref on the queue, which will unblock the eventual queue and ring teardown.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.062940000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 24fe962c86f55347385933a1b06ca71b60854690 3bca70235a706de76fe9a81defd37d987062c686 git Not specified
CNA Linux Linux affected 24fe962c86f55347385933a1b06ca71b60854690 2cd945492bc5b472e814272e88b731bb9bb17629 git Not specified
CNA Linux Linux affected 24fe962c86f55347385933a1b06ca71b60854690 952b5d36f6a298f57c52a59e72076c69386a8aaf git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2cd945492bc5b472e814272e88b731bb9bb17629 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3bca70235a706de76fe9a81defd37d987062c686 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/952b5d36f6a298f57c52a59e72076c69386a8aaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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