fuse: fix missing barrier when checking io-uring readiness
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.
CVE-2026-80859
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80859
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3393ff964e0fa5def66570c54a4612bf9df06b76",
"lessThan": "8974575898cd7a4c818088f102b2e7a0286d3302",
"versionType": "git"
},
{
"status": "affected",
"version": "3393ff964e0fa5def66570c54a4612bf9df06b76",
"lessThan": "dd9c835709f4bb3e4256eea7573e4e6e18f956de",
"versionType": "git"
},
{
"status": "affected",
"version": "3393ff964e0fa5def66570c54a4612bf9df06b76",
"lessThan": "edb310bc27f0ad83e7fd558a3caf1a94ca511654",
"versionType": "git"
}
],
"programFiles": [
"fs/fuse/dev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/fuse/dev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80859
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34874 · Revision 1
- Added to Heist Feed
- Publisher date