fuse: publish io-uring queues with release semantics
In the Linux kernel, the following vulnerability has been resolved: fuse: publish io-uring queues with release semantics fuse_uring_create_queue() initializes a fuse_ring_queue and then publishes the pointer into ring->queues[qid] with WRITE_ONCE() under the fch->lock. There are several readers that may concurrently be fetching that pointer locklessly and then deferencing it. WRITE_ONCE() doesn't ensure ordering of the queue's field initialization before the ring->queues[qid] pointer assignment. The queue must be published with smp_store_release() so the field initialization is guaranteed to happen before. Readers in paths where the read may happen concurrently with the store need to use READ_ONCE() because any race involving a plain access is undefined.
CVE-2026-80858
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-2026-80858
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": "24fe962c86f55347385933a1b06ca71b60854690",
"lessThan": "a5bb215dbc34b4c6a5e144ea1416bf66450d519f",
"versionType": "git"
},
{
"status": "affected",
"version": "24fe962c86f55347385933a1b06ca71b60854690",
"lessThan": "a1bb359c443d048fe5dfd6ca9caf4e3897f3e9aa",
"versionType": "git"
},
{
"status": "affected",
"version": "24fe962c86f55347385933a1b06ca71b60854690",
"lessThan": "42df916e5a5f8fb4b60c8cefb54318d1ec02c580",
"versionType": "git"
}
],
"programFiles": [
"fs/fuse/dev_uring.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_uring.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80858
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34873 · Revision 1
- Added to Heist Feed
- Publisher date