Bug 2389485 (CVE-2025-38610)

Summary: CVE-2025-38610 kernel: powercap: dtpm_cpu: Fix NULL pointer dereference in get_pd_power_uw()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-08-19 18:03:24 UTC 
In the Linux kernel, the following vulnerability has been resolved:

powercap: dtpm_cpu: Fix NULL pointer dereference in get_pd_power_uw()

The get_pd_power_uw() function can crash with a NULL pointer dereference
when em_cpu_get() returns NULL. This occurs when a CPU becomes impossible
during runtime, causing get_cpu_device() to return NULL, which propagates
through em_cpu_get() and leads to a crash when em_span_cpus() dereferences
the NULL pointer.

Add a NULL check after em_cpu_get() and return 0 if unavailable,
matching the existing fallback behavior in __dtpm_cpu_setup().

[ rjw: Drop an excess empty code line ]
Comment 1 Keith Grant 2025-08-20 17:30:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081923-CVE-2025-38610-9b4f@gregkh/T