CVE-2026-72212 (GCVE-0-2026-72212)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
Modified
2026-08-17 05:10
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
mm/memory_hotplug: fix incorrect altmap passing in error path
In create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds
with memmap_on_memory enabled, the vmemmap pages are allocated from
params.altmap. If create_memory_block_devices() subsequently fails, the
error path calls arch_remove_memory() with a NULL altmap instead of
params.altmap.
This is a bug that could lead to memory corruption. Since altmap is NULL,
vmemmap_free() falls back to freeing the vmemmap pages into the system
buddy allocator via free_pages() instead of the altmap.
arch_remove_memory() then immediately destroys the physical linear mapping
for this memory. This injects unowned pages into the buddy allocator,
causing machine checks or memory corruption if the system later attempts
to allocate and use those freed pages.
Fix this by passing params.altmap to arch_remove_memory() in the error
path.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
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"product": "Linux",
"programFiles": [
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"status": "unaffected",
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/memory_hotplug: fix incorrect altmap passing in error path\n\nIn create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds\nwith memmap_on_memory enabled, the vmemmap pages are allocated from\nparams.altmap. If create_memory_block_devices() subsequently fails, the\nerror path calls arch_remove_memory() with a NULL altmap instead of\nparams.altmap.\n\nThis is a bug that could lead to memory corruption. Since altmap is NULL,\nvmemmap_free() falls back to freeing the vmemmap pages into the system\nbuddy allocator via free_pages() instead of the altmap. \narch_remove_memory() then immediately destroys the physical linear mapping\nfor this memory. This injects unowned pages into the buddy allocator,\ncausing machine checks or memory corruption if the system later attempts\nto allocate and use those freed pages.\n\nFix this by passing params.altmap to arch_remove_memory() in the error\npath."
}
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"providerMetadata": {
"dateUpdated": "2026-08-17T05:10:26.630Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/3833e6abdbbfb59ec8203a84a84206cb7ffb41ac"
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{
"url": "https://git.kernel.org/stable/c/722e6c54bde6391fb95f0357f555aca887c7b18c"
},
{
"url": "https://git.kernel.org/stable/c/2f9e3ec17c3d2093c664c00a027588a446c39894"
},
{
"url": "https://git.kernel.org/stable/c/2fac4afa0e2e68841334c78c1821e49f74fbc66a"
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],
"title": "mm/memory_hotplug: fix incorrect altmap passing in error path",
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"cveId": "CVE-2026-72212",
"datePublished": "2026-08-15T05:54:07.077Z",
"dateReserved": "2026-08-09T03:40:39.912Z",
"dateUpdated": "2026-08-17T05:10:26.630Z",
"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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