CVE-2026-68421

CVE CVE-2026-68421EUVD EUVD-2026-55607Published 2026-08-10T12:04:41.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; patch: 6.18.42; 6.12; 7c65ae81ea86a6ed8086e1a5651acd766187f19b <e2f188cdbf8312289532c36eb4e9eb1c9544d43a; patch: 7.1.6; patch: 7.2-rc4; 7c65ae81ea86a6ed8086e1a5651acd766187f19b <b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da; 7c65ae81ea86a6ed8086e1a5651acd766187f19b <2907e9d0f05b506dfd58aec589a23042a56ef36b

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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