github - ghsa-7jh9-v3vw-v9px

GHSA-7JH9-V3VW-V9PX

Vulnerability from github – Published: 2024-10-21 12:30 – Updated: 2024-10-22 18:32

Details

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

mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway

Syzbot reports a UAF in hugetlb_fault(). This happens because vmf_anon_prepare() could drop the per-VMA lock and allow the current VMA to be freed before hugetlb_vma_unlock_read() is called.

We can fix this by using a modified version of vmf_anon_prepare() that doesn't release the VMA lock on failure, and then release it ourselves after hugetlb_vma_unlock_read().

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-47676"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T12:15:04Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb.c: fix UAF of vma in hugetlb fault pathway\n\nSyzbot reports a UAF in hugetlb_fault().  This happens because\nvmf_anon_prepare() could drop the per-VMA lock and allow the current VMA\nto be freed before hugetlb_vma_unlock_read() is called.\n\nWe can fix this by using a modified version of vmf_anon_prepare() that\ndoesn\u0027t release the VMA lock on failure, and then release it ourselves\nafter hugetlb_vma_unlock_read().",
  "id": "GHSA-7jh9-v3vw-v9px",
  "modified": "2024-10-22T18:32:09Z",
  "published": "2024-10-21T12:30:54Z",
  "references": [
    {
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47676"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98b74bb4d7e96b4da5ef3126511febe55b76b807"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d59ebc99dee0a2687a26df94b901eb8216dbf876"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e897d184a8dd4a4e1f39c8c495598e4d9472776c"
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  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-47676 (GCVE-0-2024-47676)

Vulnerability from cvelistv5 – Published: 2024-10-21 11:53 – Updated: 2025-05-04 09:37

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway Syzbot reports a UAF in hugetlb_fault(). This happens because vmf_anon_prepare() could drop the per-VMA lock and allow the current VMA to be freed before hugetlb_vma_unlock_read() is called. We can fix this by using a modified version of vmf_anon_prepare() that doesn't release the VMA lock on failure, and then release it ourselves after hugetlb_vma_unlock_read().

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/e897d184a8dd4a4e1…
	https://git.kernel.org/stable/c/d59ebc99dee0a2687…
	https://git.kernel.org/stable/c/98b74bb4d7e96b4da…

Impacted products

Vendor

Product

Version

Linux

Affected: 9acad7ba3e25d11f4c96df1b7312ae89e6faca5c , < e897d184a8dd4a4e1f39c8c495598e4d9472776c (git)
Affected: 9acad7ba3e25d11f4c96df1b7312ae89e6faca5c , < d59ebc99dee0a2687a26df94b901eb8216dbf876 (git)
Affected: 9acad7ba3e25d11f4c96df1b7312ae89e6faca5c , < 98b74bb4d7e96b4da5ef3126511febe55b76b807 (git)

Linux

Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.10.13 , ≤ 6.10.* (semver)
Unaffected: 6.11.2 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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                "id": "CVE-2024-47676",
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                "timestamp": "2024-10-21T13:07:59.972172Z",
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Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

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GHSA-7JH9-V3VW-V9PX

CVE-2024-47676 (GCVE-0-2024-47676)

Tags

Sightings

Nomenclature