Description
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 ]
Affected products
linux: linux kernel; debian: debian linux
References6
- git.kernel.org/stable/c/15eece6c5b05e5f9db0711978c3e3b7f1a2cfe12 Patch
- git.kernel.org/stable/c/1a677d0ceb4a5d62117b711a8b2e0aee80d33015 Patch
- git.kernel.org/stable/c/32a48db4cf28ea087214c261da8476db218d08bd Patch
- git.kernel.org/stable/c/356d09c7f5bf525086002a34f8bae40b134d1611 Patch
- git.kernel.org/stable/c/c6dad167aade4bf0bef9130f2f149f4249fc4ad0 Patch
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 9 · as of 7 November 2026
- CWE
- CWE-476
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