sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx()
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx() put_prev_task_scx() warns when a runnable task drops to a lower sched_class without SCX_OPS_ENQ_LAST, on the assumption that balance_one() would have kept it running. Core scheduling breaks that: a forced-idle SMT sibling reschedules through the core_pick fast path in pick_next_task(), which skips pick_task_scx() and thus balance_one(), so a runnable task can drop to idle with ENQ_LAST unset. Gate the warning on sched_cpu_cookie_match(): a cookie mismatch means core scheduling forced the idle, while a match (or core scheduling off) still catches a genuine missing-ENQ_LAST drop.
CVE-2026-68421
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-2026-68421
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": "7c65ae81ea86a6ed8086e1a5651acd766187f19b",
"lessThan": "6267ebee9f2f3e26f4968bf6dc29d350620fa320",
"versionType": "git"
},
{
"status": "affected",
"version": "7c65ae81ea86a6ed8086e1a5651acd766187f19b",
"lessThan": "2907e9d0f05b506dfd58aec589a23042a56ef36b",
"versionType": "git"
},
{
"status": "affected",
"version": "7c65ae81ea86a6ed8086e1a5651acd766187f19b",
"lessThan": "e2f188cdbf8312289532c36eb4e9eb1c9544d43a",
"versionType": "git"
},
{
"status": "affected",
"version": "7c65ae81ea86a6ed8086e1a5651acd766187f19b",
"lessThan": "b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da",
"versionType": "git"
}
],
"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": "6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/sched/ext/ext.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68421
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46477 · Revision 1
- Added to Heist Feed
- Publisher date