CVE-2026-74524 (GCVE-0-2026-74524)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-17 05:21
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove
remove_pud_mapping() and remove_p4d_mapping() obtain a child table base
with pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for
addr.
RISC-V folds page-table levels at runtime. When a level is folded, its
offset helper returns the parent entry itself, but the index can still be
nonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39
folds both P4D and PUD, so memory hot-remove can descend into unrelated
memory and pass an invalid page to __free_pages(). This can trigger:
kernel BUG at include/linux/mm.h:1810!
VM_BUG_ON_PAGE(page_ref_count(page) == 0)
arch_remove_memory+0x1e/0x5c
try_remove_memory+0x15e/0x200
remove_memory+0x24/0x3c
Only add the index when the corresponding page-table level is enabled,
matching p4d_offset() and pud_offset().
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/riscv/mm/init.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versions": [
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"versions": [
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"version": "6.11"
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"version": "0",
"versionType": "semver"
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"status": "unaffected",
"version": "6.12.103",
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},
{
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"status": "unaffected",
"version": "6.18.44",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
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{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix out-of-bounds page-table walk during memory hot-remove\n\nremove_pud_mapping() and remove_p4d_mapping() obtain a child table base\nwith pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for\naddr.\n\nRISC-V folds page-table levels at runtime. When a level is folded, its\noffset helper returns the parent entry itself, but the index can still be\nnonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39\nfolds both P4D and PUD, so memory hot-remove can descend into unrelated\nmemory and pass an invalid page to __free_pages(). This can trigger:\n\n kernel BUG at include/linux/mm.h:1810!\n VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n arch_remove_memory+0x1e/0x5c\n try_remove_memory+0x15e/0x200\n remove_memory+0x24/0x3c\n\nOnly add the index when the corresponding page-table level is enabled,\nmatching p4d_offset() and pud_offset()."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:21:07.108Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1da6d832eda02d908df11a30ba6a856b98a3dd76"
},
{
"url": "https://git.kernel.org/stable/c/54e07a158f7aea2754849d3a5a4cba1ac338ae7e"
},
{
"url": "https://git.kernel.org/stable/c/1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2"
},
{
"url": "https://git.kernel.org/stable/c/a0188cc133696627857d16054e43f9ebc7efc821"
}
],
"title": "riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-74524",
"datePublished": "2026-08-15T12:27:41.735Z",
"dateReserved": "2026-08-15T05:44:03.911Z",
"dateUpdated": "2026-08-17T05:21:07.108Z",
"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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