timers/migration: Fix livelock in tmigr_handle_remote_up()

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Summary

CVECVE-2026-53180
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:35 UTC
Updated2026-06-25 09:16:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: timers/migration: Fix livelock in tmigr_handle_remote_up() tmigr_handle_remote_cpu() skips timer_expire_remote() when cpu == smp_processor_id(), assuming the local softirq path already handled this CPU's timers. This assumption is wrong because jiffies can advance after the handling of the CPU's global timers in run_timer_base(BASE_GLOBAL) and before tmigr_handle_remote() evaluates the expiry times. As a consequence a timer which expires after the CPU local timer wheel advanced and becomes expired in the remote handling is ignored and the callback is never invoked and removed from the timer wheel. What's worse is that fetch_next_timer_interrupt_remote() keeps reporting it as expired, and the event is re-queued with expires == now on each iteration. The goto-again loop spins indefinitely. Fix this by calling timer_expire_remote() unconditionally. That's minimal overhead for the common case as __run_timer_base() returns immediately if there is nothing to expire in the local wheel. [ tglx: Amend change log and add a comment ]

Risk And Classification

EPSS: 0.001750000 probability, percentile 0.072340000 (date 2026-06-26)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7ee988770326fca440472200c3eb58935fe712f6 07b3b83587fb3012619f4439389b64a955fc7836 git Not specified
CNA Linux Linux affected 7ee988770326fca440472200c3eb58935fe712f6 1d6c2062b77be09ec15d6bf637b2e2221c4482fc git Not specified
CNA Linux Linux affected 7ee988770326fca440472200c3eb58935fe712f6 d338e61ea94052a786aac9f58e9f0d8520afa0fd git Not specified
CNA Linux Linux affected 7ee988770326fca440472200c3eb58935fe712f6 d486b4934a8e504376b85cdb3766f306d57aff5b git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d486b4934a8e504376b85cdb3766f306d57aff5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d338e61ea94052a786aac9f58e9f0d8520afa0fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d6c2062b77be09ec15d6bf637b2e2221c4482fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07b3b83587fb3012619f4439389b64a955fc7836 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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