Description
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.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 3393ff964e0fa5def66570c54a4612bf9df06b76, < 8974575898cd7a4c818088f102b2e7a0286d3302; >= 3393ff964e0fa5def66570c54a4612bf9df06b76, < dd9c835709f4bb3e4256eea7573e4e6e18f956de; >= 3393ff964e0fa5def66570c54a4612bf9df06b76, < edb310bc27f0ad83e7fd558a3caf1a94ca511654 |
| Linux | Linux | 6.14 |
References
Timeline
- Published
- Sep 4, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received