cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks
In the Linux kernel, the following vulnerability has been resolved: cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks cpufreq_cpu_get() returns NULL when no cpufreq policy is associated with the requested CPU, for example because the CPU is offline or the policy has already been torn down. Both amd_pstate_power_supply_notifier() and amd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then pass that pointer to amd_pstate_get_balanced_epp() and amd_pstate_set_epp(), which dereference it unconditionally. A racing CPU hotplug or driver teardown can therefore lead to a NULL pointer dereference on either of these dynamic EPP paths. The third cpufreq_cpu_get() caller in this file, amd_pstate_verify(), already handles the NULL case. Bring the two new callers in line with that pattern: return NOTIFY_OK from the power-supply notifier (matching the other "nothing to do" exits) and -ENODEV from amd_pstate_profile_set() (the usual cpufreq error for a missing CPU policy). Found by code inspection; not tested on hardware.
CVE-2026-92492
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-92492
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "471d6659925aa0dcb4ab2520fa5ee3f49dfeab22",
"lessThan": "70c8c8b50d80f681f50ddcc66a9400dd87508913",
"versionType": "git"
},
{
"status": "affected",
"version": "e30ca6dd5345c5b8ba05f346a8e81105352fe571",
"lessThan": "f4ade8d224756ab69f108204dde6777bac4664e4",
"versionType": "git"
},
{
"status": "affected",
"version": "e30ca6dd5345c5b8ba05f346a8e81105352fe571",
"lessThan": "39c0cf62fc7851a17782e7efe8dfb2948739c681",
"versionType": "git"
}
],
"programFiles": [
"drivers/cpufreq/amd-pstate.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/cpufreq/amd-pstate.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-92492
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37725 · Revision 1
- Added to Heist Feed
- Publisher date