CVE-2026-80859
CVE CVE-2026-80859EUVD EUVD-2026-71309Published 2026-09-04T15:55:13.000ZLast changed 2026-09-11T09:57:14.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; 3393ff964e0fa5def66570c54a4612bf9df06b76 <dd9c835709f4bb3e4256eea7573e4e6e18f956de; 3393ff964e0fa5def66570c54a4612bf9df06b76 <8974575898cd7a4c818088f102b2e7a0286d3302; patch: 6.18.51; patch: 7.3-rc1; 6.14; 3393ff964e0fa5def66570c54a4612bf9df06b76 <edb310bc27f0ad83e7fd558a3caf1a94ca511654; patch: 7.2.3
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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