CVE-2026-80859

In 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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/8974575898cd7a4c818088f102b2e7a0286d3302
https://git.kernel.org/stable/c/dd9c835709f4bb3e4256eea7573e4e6e18f956de
https://git.kernel.org/stable/c/edb310bc27f0ad83e7fd558a3caf1a94ca511654

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-04 16:18

Updated : 2026-09-11 10:16

NVD link : CVE-2026-80859

Mitre link : CVE-2026-80859

CVE.ORG link : CVE-2026-80859

JSON object : View

Products Affected

No product.

CWE

No CWE.

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