Vulnerability-Lookup

GHSA-C8P2-FFWX-RGC9

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h

get_align_mask() returns huge_page_mask_align() for hugetlbfs, but get_align_bits() adds va_align.bits regardless, so vm_unmapped_area() returns an address off the huge page boundary and __unmap_hugepage_range() hits BUG_ON(start & ~huge_page_mask(h)) at teardown.

This can be triggered on Carrizo and FX-8370E, both hstates.

Pass the file to get_align_bits() and skip the randomisation for hugetlbfs.

[ bp: Massage commit message. ]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98729"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:26Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Don\u0027t apply va_align to hugetlb mappings on AMD F15h\n\nget_align_mask() returns huge_page_mask_align() for hugetlbfs, but get_align_bits()\nadds va_align.bits regardless, so vm_unmapped_area() returns an address off the huge\npage boundary and __unmap_hugepage_range() hits BUG_ON(start \u0026 ~huge_page_mask(h)) at\nteardown.\n\nThis can be triggered on Carrizo and FX-8370E, both hstates.\n\nPass the file to get_align_bits() and skip the randomisation for hugetlbfs.\n\n  [ bp: Massage commit message. ]",
  "id": "GHSA-c8p2-ffwx-rgc9",
  "modified": "2026-10-18T18:32:01Z",
  "published": "2026-10-18T18:32:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98729"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b46b2e2de47ca9449532b0a7110ed99f79061d6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2457a7e2727dc747a61a50d65c2f259afce8c45"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe23680e6f1d52b8cc45d77bf7c54249508a81c7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98729 (GCVE-0-2026-98729)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-19 09:24

Title

x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h get_align_mask() returns huge_page_mask_align() for hugetlbfs, but get_align_bits() adds va_align.bits regardless, so vm_unmapped_area() returns an address off the huge page boundary and __unmap_hugepage_range() hits BUG_ON(start & ~huge_page_mask(h)) at teardown. This can be triggered on Carrizo and FX-8370E, both hstates. Pass the file to get_align_bits() and skip the randomisation for hugetlbfs. [ bp: Massage commit message. ]

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6820 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/fe23680e6f1d52b8c…
https://git.kernel.org/stable/c/b46b2e2de47ca9449…
https://git.kernel.org/stable/c/d2457a7e2727dc747…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0 , < fe23680e6f1d52b8cc45d77bf7c54249508a81c7 (git) Affected: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0 , < b46b2e2de47ca9449532b0a7110ed99f79061d6e (git) Affected: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0 , < d2457a7e2727dc747a61a50d65c2f259afce8c45 (git)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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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.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

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