Medium 5.5Published Mar 25, 2026

CVE-2026-23332cpufreq: intel_pstate: Fix crash during turbo disable

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 973207ae3d7c3c92df4a382df5d7bd695deaa904 before a1850e2aef4d15405e7ff53fd51c4b3124d46182; from 973207ae3d7c3c92df4a382df5d7bd695deaa904 before d20d48916ce8531b157c2edeba76d69af2974270; 973207ae3d7c3c92df4a382df5d7bd695deaa904 builds before 6b050482ec40569429d963ac52afa878691b04c9	CNA record
linux linux_kernel linux:linux_kernel	from 6.16.1 before 6.18.17; from 6.19 before 6.19.7; 6.16; 7.0; 7.0; 7.0; 7.0; 7.0; and 2 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.