CVE-2026-72066 (GCVE-0-2026-72066)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-19 16:35
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
cpu: hotplug: Bound hotplug states sysfs output
states_show() adds CPU hotplug state names into a single sysfs buffer
using sprintf(). With enough registered states, this can write past the
end of the PAGE_SIZE buffer.
Use sysfs_emit_at() so output is bounded.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e Version: 98f8cdce1db580b99fce823a48eea2cb2bdb261e |
||
{
"containers": {
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"programFiles": [
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],
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"versions": [
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"version": "0",
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{
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"status": "unaffected",
"version": "5.10.265",
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{
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"status": "unaffected",
"version": "5.15.212",
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{
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"status": "unaffected",
"version": "6.1.178",
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{
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"status": "unaffected",
"version": "6.6.145",
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{
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"status": "unaffected",
"version": "6.12.97",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
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},
{
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"status": "unaffected",
"version": "7.1.5",
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{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpu: hotplug: Bound hotplug states sysfs output\n\nstates_show() adds CPU hotplug state names into a single sysfs buffer\nusing sprintf(). With enough registered states, this can write past the\nend of the PAGE_SIZE buffer.\n\nUse sysfs_emit_at() so output is bounded."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is in states_show() on the read path for /sys/devices/system/cpu/hotplug/states, reached only via a local sysfs/VFS read() syscall. No network packet handler, adjacent protocol, or physical attach path invokes this CPU hotplug sysfs callback.\nAC:L - Once enough CPU hotplug states are registered (plausible on cloud servers, KVM hosts, Android, and heavily configured distros with hundreds of cpuhp_setup_state() users), a single read deterministically executes unbounded sprintf() past the PAGE_SIZE buffer with no race or attacker-uncontrollable timing.\nPR:L - states is DEVICE_ATTR_RO (mode 0444), so any unprivileged local user can open and read /sys/devices/system/cpu/hotplug/states. states_show() performs no capability, namespace, or credential check before formatting output into the sysfs buffer.\nUI:N - Exploitation requires only the attacker reading the sysfs attribute; no victim mount, driver bind, module load, or other interactive action is needed beyond the attacker\u0027s own read once sufficient hotplug states exist at boot.\nS:U - The out-of-bounds write corrupts kernel heap memory within the same OS/kernel security authority. This is standard kernel memory corruption, not a KVM guest-to-host escape, IOMMU boundary bypass, or other cross-scope boundary violation.\nC:H - Unbounded sprintf() writes past the fixed PAGE_SIZE buffer allocated by sysfs_kf_seq_show(), corrupting adjacent kmalloc heap memory. Per kernel guidance, this class of memory-corruption OOB write can be leveraged for arbitrary kernel memory disclosure.\nI:H - The vulnerable loop advances buf and repeatedly sprintf()s without bounds, producing a kernel heap out-of-bounds write that can corrupt adjacent objects and enable control-flow hijacking or arbitrary kernel writes per OOB-write scoring guidance.\nA:H - Writing past the PAGE_SIZE sysfs show buffer corrupts adjacent kernel heap objects and can cause immediate kernel oops/panic during the read path or when corrupted adjacent allocations are later used, satisfying High availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:35:55.630Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/27481cf4365a6ff5c9be3590143e7ed434000266"
},
{
"url": "https://git.kernel.org/stable/c/2408be459c70ef4250da1a9e50f5478e6b250d61"
},
{
"url": "https://git.kernel.org/stable/c/de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635"
},
{
"url": "https://git.kernel.org/stable/c/998f66e9ce320f3433f60b948e3698b744754a46"
},
{
"url": "https://git.kernel.org/stable/c/61a73a123ac7a7fbc57382531f8cb7092d569aba"
},
{
"url": "https://git.kernel.org/stable/c/6cb15b81ff545840048fb0e1a6e827d560dbf367"
},
{
"url": "https://git.kernel.org/stable/c/631d53102da9f469c96b882b770336bec095b833"
},
{
"url": "https://git.kernel.org/stable/c/86f436567f2516a0083b210bedc933544826a2c3"
}
],
"title": "cpu: hotplug: Bound hotplug states sysfs output",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72066",
"datePublished": "2026-08-15T05:52:19.527Z",
"dateReserved": "2026-08-09T03:40:39.903Z",
"dateUpdated": "2026-08-19T16:35:55.630Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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