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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
7c65ae81ea86a6ed8086e1a5651acd766187f19b affected < 2907e9d0f05b506dfd58aec589a23042a56ef36b
7c65ae81ea86a6ed8086e1a5651acd766187f19b affected < e2f188cdbf8312289532c36eb4e9eb1c9544d43a
7c65ae81ea86a6ed8086e1a5651acd766187f19b affected < b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da
Linux Linux affected
Version Status Constraints
6.12 affected —
0 unaffected < 6.12
6.18.42 unaffected ≤ 6.18.*
7.1.6 unaffected ≤ 7.1.*
7.2-rc4 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/2907e9d0f05b506dfd58aec589a23042a56ef36b cve-icon
https://git.kernel.org/stable/c/b7d9c359e5cf867f7eb23df3bb1c6b9e58af24da cve-icon
https://git.kernel.org/stable/c/e2f188cdbf8312289532c36eb4e9eb1c9544d43a cve-icon
History

Mon, 10 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Description 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.
Title sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-10T12:04:41.946Z

Reserved: 2026-07-30T09:28:09.392Z

Link: CVE-2026-68421

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

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