sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task ebf1ccff79c4 ("sched_ext: Fix ops.dequeue() semantics") moved the final ops_state store in scx_dispatch_enqueue() after the DSQ unlock so that the custody update and ops.dequeue() precede it. A task can thus be found on a DSQ while still SCX_OPSS_DISPATCHING. The dequeue and core-sched pick paths wait for the state to clear in ops_dequeue() but the reenqueue paths don't. A reenqueue in that window runs ops.enqueue() and sets SCX_OPSS_QUEUED before the dispatch has completed. The dispatcher's final store then overwrites it with SCX_OPSS_NONE and finish_dispatch() drops every later dispatch of the task. Wait for SCX_OPSS_DISPATCHING to clear before dequeueing a task for reenqueue, the same way ops_dequeue() does.
CVE-2026-98864
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-2026-98864
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": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d",
"lessThan": "43457bf6550044c40bd6d3fcdf9ea66f5a55d139",
"versionType": "git"
},
{
"status": "affected",
"version": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d",
"lessThan": "7de9a6fb44eae4f05e68c805d58b9c618815adfa",
"versionType": "git"
}
],
"programFiles": [
"kernel/sched/ext/ext.c",
"kernel/sched/ext/internal.h",
"kernel/sched/ext/sub.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/sched/ext/ext.c",
"kernel/sched/ext/internal.h",
"kernel/sched/ext/sub.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98864
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38758 · Revision 1
- Added to Heist Feed
- Publisher date