Answer in brief
CVE-2026-68421 records a Unknown severity vulnerability in sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7c65ae81ea86a6ed8086e1a5651acd766187f19b <2907e9d0f05b506dfd58aec589a23042a56ef36b || >=7c65ae81ea86a6ed8086e1a5651acd766187f19b <e2f188cdbf8312289532c36eb4e9eb1c9544d43a || >=7c65ae81ea86a6ed8086e1a5651acd766187f19b <b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da | 2907e9d0f05b506dfd58aec589a23042a56ef36b, e2f188cdbf8312289532c36eb4e9eb1c9544d43a, b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-68421 records a Unknown severity vulnerability in sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7c65ae81ea86a6ed8086e1a5651acd766187f19b <2907e9d0f05b506dfd58aec589a23042a56ef36b || >=7c65ae81ea86a6ed8086e1a5651acd766187f19b <e2f188cdbf8312289532c36eb4e9eb1c9544d43a || >=7c65ae81ea86a6ed8086e1a5651acd766187f19b <b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da | 2907e9d0f05b506dfd58aec589a23042a56ef36b, e2f188cdbf8312289532c36eb4e9eb1c9544d43a, b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.