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.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-debuginfo-common-aarch64Upgrade perf6.18-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade bpftool6.18Upgrade kernel6.18-tools-debuginfoUpgrade microvm-kernel6.18Upgrade python3-perf6.18Upgrade kernel6.18-modules-extraUpgrade kernel6.18-tools-develUpgrade kernel6.18Upgrade kernel6.18-headersUpgrade kernel6.18-develUpgrade kernel-livepatch-6.18.44-99.149Upgrade python3-perf6.18-debuginfoUpgrade kernel6.18-debuginfoUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.18-debuginfo-common-x86_64Upgrade perf6.18 | Sep 30, 2026 | Aug 10, 2026 |
| Ubuntu | — | Upgrade linux-image-oem-7.0Upgrade linux-image-oracle-64kUpgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-azureUpgrade linux-image-azure-fdeUpgrade linux-image-generic-7.0Upgrade linux-image-aws-64kUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-38-genericUpgrade linux-image-ibmUpgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-1014-awsUpgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-gcpUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-awsUpgrade linux-image-oracle-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-realtimeUpgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-virtualUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-generic-64kUpgrade linux-image-oem-26.04Upgrade linux-image-genericUpgrade linux-image-gkeUpgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-gcp-64kUpgrade linux-image-gke-64kUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-azure-lts-26.04Upgrade linux-image-7.0.0-1017-azureUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-gke-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gcp-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-azure-fde-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-oracleUpgrade linux-image-oem-26.04aUpgrade linux-image-aws-64k-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-gcp-64k-7.0 | Oct 7, 2026 | Oct 6, 2026 |
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