fuse: fix missing barrier when checking io-uring readiness

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80859
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:15 UTC
Updated2026-09-11 10:16:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fuse: fix missing barrier when checking io-uring readiness fuse_block_alloc() reads fch->initialized and then fch->io_uring. fch->io_uring is set before fch->initialized, ordered by the smp_wmb() in fuse_chan_set_intialized(), but fuse_block_alloc() has no matching read barrier between the two loads. This may lead a CPU to observe fch->initialized=1 but fch->io_uring=0, and skip the check that blocks request allocation until the io-uring queues are ready. This can reintroduce the lock-order inversion deadlock that commit 3393ff964e0f prevents. Add an smp_rmb() barrier to pair with the smp_wmb() in fuse_chan_set_initialized() to prevent this.

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.040730000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3393ff964e0fa5def66570c54a4612bf9df06b76 8974575898cd7a4c818088f102b2e7a0286d3302 git Not specified
CNA Linux Linux affected 3393ff964e0fa5def66570c54a4612bf9df06b76 dd9c835709f4bb3e4256eea7573e4e6e18f956de git Not specified
CNA Linux Linux affected 3393ff964e0fa5def66570c54a4612bf9df06b76 edb310bc27f0ad83e7fd558a3caf1a94ca511654 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/dd9c835709f4bb3e4256eea7573e4e6e18f956de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8974575898cd7a4c818088f102b2e7a0286d3302 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/edb310bc27f0ad83e7fd558a3caf1a94ca511654 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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