Bug 2493703 (CVE-2026-53315)

Summary: CVE-2026-53315 kernel: drm/amd/ras: Fix NULL deref in ras_core_get_utc_second_timestamp()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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OS: Linux   
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Description OSIDB Bzimport 2026-06-26 21:01:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/ras: Fix NULL deref in ras_core_get_utc_second_timestamp()

ras_core_get_utc_second_timestamp() retrieves the current UTC timestamp
(in seconds since the Unix epoch) through a platform-specific RAS system
callback and is used for timestamping RAS error events.

The function checks ras_core in the conditional statement before calling
the sys_fn callback. However, when the condition fails, the function
prints an error message using ras_core->dev.

If ras_core is NULL, this can lead to a potential NULL pointer
dereference when accessing ras_core->dev.

Add an early NULL check for ras_core at the beginning of the function
and return 0 when the pointer is not valid. This prevents the
dereference and makes the control flow clearer.
Comment 1 Mauro Matteo Cascella 2026-06-29 17:17:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062621-CVE-2026-53315-f75d@gregkh/T