SB2026060429 - NULL pointer dereference in Linux kernel clocksource driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-46257)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a null pointer dereference in the timer-sp804 delay timer handling when read_current_timer is called on ARM32 platforms where SP804 is not registered as the sched_clock. A local user can trigger read_current_timer to cause a denial of service.

The issue occurs because the delay timer uses an uninitialized clkevt instance under this platform-specific configuration.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/693b0b594b0f278bafa784984129c0c0f988e352
• https://git.kernel.org/stable/c/694921a93f3e3621e067afc545cedf6fe3b234a9