CVE-2026-80859
- Source
- https://cve.org/CVERecord?id=CVE-2026-80859
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80859.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-80859
- Downstream
- Published
- 2026-09-04T15:55:13.378Z
- Modified
- 2026-09-06T03:46:59.616773315Z
- Summary
- fuse: fix missing barrier when checking io-uring readiness
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
fuse: fix missing barrier when checking io-uring readiness
fuseblockalloc() reads fch->initialized and then fch->iouring. fch->iouring is set before fch->initialized, ordered by the smpwmb() in fusechansetintialized(), but fuseblockalloc() 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 smprmb() barrier to pair with the smpwmb() in fusechanset_initialized() to prevent this.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80859.json" }- References
-
- https://git.kernel.org/stable/c/dd9c835709f4bb3e4256eea7573e4e6e18f956de
- https://git.kernel.org/stable/c/edb310bc27f0ad83e7fd558a3caf1a94ca511654
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80859.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-80859
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git