sched_ext: Fix is_bpf_migration_disabled() false negative on non-PREEMPT_RCU

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Summary

CVECVE-2026-31734
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:36 UTC
Updated2026-05-01 15:24:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix is_bpf_migration_disabled() false negative on non-PREEMPT_RCU Since commit 8e4f0b1ebcf2 ("bpf: use rcu_read_lock_dont_migrate() for trampoline.c"), the BPF prolog (__bpf_prog_enter) calls migrate_disable() only when CONFIG_PREEMPT_RCU is enabled, via rcu_read_lock_dont_migrate(). Without CONFIG_PREEMPT_RCU, the prolog never touches migration_disabled, so migration_disabled == 1 always means the task is truly migration-disabled regardless of whether it is the current task. The old unconditional p == current check was a false negative in this case, potentially allowing a migration-disabled task to be dispatched to a remote CPU and triggering scx_error in task_can_run_on_remote_rq(). Only apply the p == current disambiguation when CONFIG_PREEMPT_RCU is enabled, where the ambiguity with the BPF prolog still exists.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.040610000 (date 2026-05-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8e4f0b1ebcf2180ab594f204f01279a666dadf3b 72c43eb2e334febe93018cfb68ae828f55c6e49e git Not specified
CNA Linux Linux affected 8e4f0b1ebcf2180ab594f204f01279a666dadf3b b4992a9446bb9a639007bfd32bf5c5a7e30199e5 git Not specified
CNA Linux Linux affected 8e4f0b1ebcf2180ab594f204f01279a666dadf3b 0c4a59df370bea245695c00aaae6ae75747139bd git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/72c43eb2e334febe93018cfb68ae828f55c6e49e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c4a59df370bea245695c00aaae6ae75747139bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b4992a9446bb9a639007bfd32bf5c5a7e30199e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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