sched_ext: Derive SCX_RQ_IN_WAKEUP from the core enqueue flags
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Derive SCX_RQ_IN_WAKEUP from the core enqueue flags schedule_deferred_locked() skips scheduling a deferred action while SCX_RQ_IN_WAKEUP is set and relies on the task_woken_scx() call that follows a wakeup enqueue to run it. enqueue_task_scx() sets the flag from the merged enqueue flags, which include the flags stashed for a remote activation. move_remote_task_to_local_dsq() thus sets SCX_RQ_IN_WAKEUP on the destination rq when the moved task was woken up, although no task_woken_scx() follows that activation. An IMMED insert into a busy destination requests a local reenqueue during that enqueue. The request gets linked but not scheduled and stays pending until an unrelated wakeup or preemption on that CPU runs the deferred actions. The IMMED task sits behind the running task in the meantime. If nothing runs them before the scheduler is disabled, the request outlives the scheduler and points into its freed per-cpu area, which the next scheduler dereferences from run_deferred(). Test the core enqueue flags for the wakeup bit. Only the core's wakeup path is followed by task_woken_scx().
CVE-2026-98463
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-2026-98463
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": "997967adf10ce26c3e7bd89598b3ded62b943052",
"lessThan": "6c401ae426e20e53a3398a8e79afd0964c0f5110",
"versionType": "git"
},
{
"status": "affected",
"version": "57ccf5ccdc56954f2a91a7f66684fd31c566bde5",
"lessThan": "3fdf2ceb31e8aff77451e468bc8409e10587916a",
"versionType": "git"
},
{
"status": "affected",
"version": "57ccf5ccdc56954f2a91a7f66684fd31c566bde5",
"lessThan": "df5cdc2c832ca4e8a6d774596b9005558761a403",
"versionType": "git"
},
{
"status": "affected",
"version": "ee502c056c4c9cce4c132ccb588e06ffe5b831c1",
"versionType": "git"
},
{
"status": "affected",
"version": "6.18.19",
"lessThan": "6.18.55",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.19.9",
"lessThan": "6.20",
"versionType": "semver"
}
],
"programFiles": [
"kernel/sched/ext/ext.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/sched/ext/ext.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98463
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38516 · Revision 1
- Added to Heist Feed
- Publisher date