CVE-2026-68421sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 7c65ae81ea86a6ed8086e1a5651acd766187f19b before 2907e9d0f05b506dfd58aec589a23042a56ef36b; from 7c65ae81ea86a6ed8086e1a5651acd766187f19b before e2f188cdbf8312289532c36eb4e9eb1c9544d43a; from 7c65ae81ea86a6ed8086e1a5651acd766187f19b before b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da | CNA record |
References
- https://git.kernel.org/stable/c/2907e9d0f05b506dfd58aec589a23042a56ef36b
- https://git.kernel.org/stable/c/e2f188cdbf8312289532c36eb4e9eb1c9544d43a
- https://git.kernel.org/stable/c/b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.