GHSA-273P-44HJ-2V3C
Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-15 15:30In 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().
{
"affected": [],
"aliases": [
"CVE-2026-74524"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T13:17:57Z",
"severity": null
},
"details": "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().",
"id": "GHSA-273p-44hj-2v3c",
"modified": "2026-08-15T15:30:35Z",
"published": "2026-08-15T15:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74524"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1da6d832eda02d908df11a30ba6a856b98a3dd76"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/54e07a158f7aea2754849d3a5a4cba1ac338ae7e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a0188cc133696627857d16054e43f9ebc7efc821"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.