CVE-2026-23332
Full vulnerability record from the local CVENow database.
Description
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-25 11:16:30.647000
Last modified
2026-11-05 22:18:15.447000
View original CVE JSON
{
"id": "CVE-2026-23332",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-25T11:16:30.647",
"lastModified": "2026-11-05T22:18:15.447",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: intel_pstate: Fix crash during turbo disable\n\nWhen the system is booted with kernel command line argument \"nosmt\" or\n\"maxcpus\" to limit the number of CPUs, disabling turbo via:\n\n echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo\n\nresults in a crash:\n\n PF: supervisor read access in kernel mode\n PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP PTI\n ...\n RIP: 0010:store_no_turbo+0x100/0x1f0\n ...\n\nThis occurs because for_each_possible_cpu() returns CPUs even if they\nare not online. For those CPUs, all_cpu_data[] will be NULL. Since\ncommit 973207ae3d7c (\"cpufreq: intel_pstate: Rearrange max frequency\nupdates handling code\"), all_cpu_data[] is dereferenced even for CPUs\nwhich are not online, causing the NULL pointer dereference.\n\nTo fix that, pass CPU number to intel_pstate_update_max_freq() and use\nall_cpu_data[] for those CPUs for which there is a valid cpufreq policy."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncpufreq: intel_pstate: Soluciona un fallo durante la desactivación del turbo\n\nCuando el sistema se inicia con el argumento de línea de comandos del kernel \"nosmt\" o \"maxcpus\" para limitar el número de CPUs, la desactivación del turbo a través de:\n\n echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo\n\nresulta en un fallo:\n\n PF: acceso de lectura de supervisor en modo kernel\n PF: error_code(0x0000) - página no presente\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP PTI\n ...\n RIP: 0010:store_no_turbo+0x100/0x1f0\n ...\n\nEsto ocurre porque for_each_possible_cpu() devuelve CPUs incluso si no están en línea. Para esas CPUs, all_cpu_data[] será NULL. Desde el commit 973207ae3d7c ('cpufreq: intel_pstate: Reorganizar el código de manejo de actualizaciones de frecuencia máxima'), all_cpu_data[] es desreferenciado incluso para CPUs que no están en línea, causando la desreferencia del puntero NULL.\n\nPara solucionar eso, pasar el número de CPU a intel_pstate_update_max_freq() y usar all_cpu_data[] para aquellas CPUs para las cuales existe una política cpufreq válida."
}
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"source": "[email protected]",
"type": "Primary",
"description": [
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