CVE-2026-23332

Summary

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: intel_pstate: Fix crash during turbo disable

When the system is booted with kernel command line argument "nosmt" or "maxcpus" to limit the number of CPUs, disabling turbo via:

echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo

results in a crash:

PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI … RIP: 0010:store_no_turbo+0x100/0x1f0 …

This occurs because for_each_possible_cpu() returns CPUs even if they are not online. For those CPUs, all_cpu_data[] will be NULL. Since commit 973207ae3d7c ("cpufreq: intel_pstate: Rearrange max frequency updates handling code"), all_cpu_data[] is dereferenced even for CPUs which are not online, causing the NULL pointer dereference.

To fix that, pass CPU number to intel_pstate_update_max_freq() and use all_cpu_data[] for those CPUs for which there is a valid cpufreq policy.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a1850e2aef4d15405e7ff53fd51c4b3124d46182
• https://git.kernel.org/stable/c/d20d48916ce8531b157c2edeba76d69af2974270
• https://git.kernel.org/stable/c/6b050482ec40569429d963ac52afa878691b04c9

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