clocksource/drivers/timer-sp804: Fix an Oops when read_current_timer is called on ARM32 platforms where the SP804 is not registered as the sched_clock.

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Summary

CVECVE-2026-46257
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 18:16:26 UTC
Updated2026-06-05 20:51:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: clocksource/drivers/timer-sp804: Fix an Oops when read_current_timer is called on ARM32 platforms where the SP804 is not registered as the sched_clock. On SP804, the delay timer shares the same clkevt instance with sched_clock. On some platforms, when sp804_clocksource_and_sched_clock_init is called with use_sched_clock not set to 1, sched_clkevt is not properly initialized. However, sp804_register_delay_timer is invoked unconditionally, and read_current_timer() subsequently calls sp804_read on an uninitialized sched_clkevt, leading to a kernel Oops when accessing sched_clkevt->value. Declare a dedicated clkevt instance exclusively for delay timer, instead of sharing the same clkevt with sched_clock. This ensures that read_current_timer continues to work correctly regardless of whether SP804 is selected as the sched_clock.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.051530000 (date 2026-06-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 640594a04f119338019b0aeed70c7301216595b3 693b0b594b0f278bafa784984129c0c0f988e352 git Not specified
CNA Linux Linux affected 640594a04f119338019b0aeed70c7301216595b3 694921a93f3e3621e067afc545cedf6fe3b234a9 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/694921a93f3e3621e067afc545cedf6fe3b234a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/693b0b594b0f278bafa784984129c0c0f988e352 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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