Bug 2376093 (CVE-2025-38113)

Summary: CVE-2025-38113 kernel: ACPI: CPPC: Fix NULL pointer dereference when nosmp is used
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 2025-07-03 09:04:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ACPI: CPPC: Fix NULL pointer dereference when nosmp is used

With nosmp in cmdline, other CPUs are not brought up, leaving
their cpc_desc_ptr NULL. CPU0's iteration via for_each_possible_cpu()
dereferences these NULL pointers, causing panic.

Panic backtrace:

[    0.401123] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8
...
[    0.403255] [<ffffffff809a5818>] cppc_allow_fast_switch+0x6a/0xd4
...
Kernel panic - not syncing: Attempted to kill init!

[ rjw: New subject ]
Comment 1 Avinash Hanwate 2025-07-03 14:21:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025070325-CVE-2025-38113-d080@gregkh/T