cpufreq: zero-initialize policy cpumask before sysfs publication
In the Linux kernel, the following vulnerability has been resolved: cpufreq: zero-initialize policy cpumask before sysfs publication cpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(), i.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus masks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate kmalloc_node() allocation, so its bitmap holds whatever the slab allocator left behind: cpufreq_online() cpufreq_policy_alloc() alloc_cpumask_var(&policy->cpus) /* bitmap is uninitialized */ kobject_init_and_add() /* policy%u/ appears in sysfs */ cpufreq_policy_online() cpumask_copy(policy->cpus, cpumask_of(cpu)) /* first valid value */ This leaves a window in which the sysfs attributes are already reachable while policy->cpus is still garbage. show()/store() gate on policy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero bitmap makes them run the attribute callbacks on a policy that is not initialized yet. Fix this by using zalloc_cpumask_var() for policy->cpus.
CVE-2026-97905
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-2026-97905
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": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "e13370c5b549712f49f80234df249303381c53b4",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "e807920031ca32b668f9e7a1efbd21858f03d64b",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "ca52482508b3ac9febe74ca4f732647d394727b8",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "06f273d29e5e0fe5c775a65c563fbeed8cd94c7a",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "0de2f3918fbbbb767e7e716178194b66560dd12a",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "6e166b9281dec98aed19213a84235250e5fdb081",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "bbc0472d2270bf732142ca71579d6ede636174ed",
"versionType": "git"
},
{
"status": "affected",
"version": "2fc3384dc75bf7333384c7a16d12c796f61c3f56",
"lessThan": "54d37bcf2f497140b9207968557ddb484058e749",
"versionType": "git"
}
],
"programFiles": [
"drivers/cpufreq/cpufreq.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/cpufreq/cpufreq.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97905
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38061 · Revision 1
- Added to Heist Feed
- Publisher date