CVE-2026-72067 (GCVE-0-2026-72067)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-17 05:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
cpu: hotplug: Preserve per instance callback errors
cpuhp_invoke_callback() unwinds earlier callbacks for the same
hotplug state when one instance fails. The rollback path currently
reuses ret, so a successful rollback can hide the original error and
make the failed transition look successful.
Keep the rollback result separate from the original error.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 Version: 724a86881d03ee5794148e65142e24ed3621be66 |
||
{
"containers": {
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"version": "0",
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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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"version": "6.12.97",
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{
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"version": "6.18.40",
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{
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"status": "unaffected",
"version": "7.1.5",
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{
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"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: Preserve per instance callback errors\n\ncpuhp_invoke_callback() unwinds earlier callbacks for the same\nhotplug state when one instance fails. The rollback path currently\nreuses ret, so a successful rollback can hide the original error and\nmake the failed transition look successful.\n\nKeep the rollback result separate from the original error."
}
],
"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 cpuhp_invoke_callback() during CPU hotplug state transitions, reached only via local kernel paths such as sysfs /sys/devices/system/cpu/cpuN/online, device_online/offline, and cpu_up()/cpu_down() from privileged local callers.\nAC:L - An attacker can reliably trigger the bug by inducing multi-instance callback failure (e.g., -ENOMEM via memory pressure) during CPU online/offline on cloud autoscaled nodes or servers running RAID/padata where rollback callbacks succeed and overwrite the original error.\nPR:L - CPU hotplug is normally admin-initiated, but an unprivileged local user can force multi-instance callback failures through memory exhaustion during system/hypervisor CPU hotplug without needing CAP_SYS_ADMIN or user-namespace admin capabilities.\nUI:N - Exploitation requires no victim interaction beyond normal system operation; it is triggered during kernel CPU hotplug transitions without the user opening files, mounting filesystems, or performing other deliberate actions.\nS:U - The vulnerability corrupts kernel CPU hotplug state-machine consistency and affects kernel subsystems on the same host; it does not cross a VM, container, or IOMMU security boundary to impact a separate authority.\nC:H - Silently completing hotplug after a failed multi-instance rollback leaves subsystems like padata and RAID5 in a state inconsistent with the hotplug machine, which can desynchronize RCU-protected structures and enable kernel memory disclosure primitives.\nI:H - When rollback overwrites the original error with success, cpuhp_up_callbacks()/cpuhp_down_callbacks() proceed and mark the CPU transition complete while multi-instance subsystem callbacks were only partially applied, corrupting kernel integrity and enabling further memory corruption.\nA:H - Proceeding past a failed multi-instance hotplug step while subsystems such as padata, RAID5, or virtio-net instances are left in an inconsistent partially-rolled-back state can cause kernel oops, panic, or hang on production cloud and server systems."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:39:59.754Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/fe9c8d641f6991614d1229a3ffd3e33b879bba9c"
},
{
"url": "https://git.kernel.org/stable/c/ef39758637cc5b603fb05b625c45a98aa306e338"
},
{
"url": "https://git.kernel.org/stable/c/95232281512b15338549171ed9a2acf21f946ffb"
},
{
"url": "https://git.kernel.org/stable/c/7a68257b90d8a9b6d605abc99469ded45ecba63b"
},
{
"url": "https://git.kernel.org/stable/c/77d4fa8a3ea1c3e8b996ac35e59aee9e77389905"
},
{
"url": "https://git.kernel.org/stable/c/f77117530fc3f5932ffb107182a6dd34006be9b6"
},
{
"url": "https://git.kernel.org/stable/c/9f7dc355f62c011e4afe8286cf71130d4bfb9d80"
},
{
"url": "https://git.kernel.org/stable/c/673db10729fb121ea1b16fe57791a0cb9eac1eb5"
}
],
"title": "cpu: hotplug: Preserve per instance callback errors",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72067",
"datePublished": "2026-08-15T05:52:20.268Z",
"dateReserved": "2026-08-09T03:40:39.903Z",
"dateUpdated": "2026-08-17T05:39:59.754Z",
"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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