CVE-2026-46257

Technical Description

In 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.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References