github - ghsa-vq28-2hrg-3rf4

GHSA-VQ28-2HRG-3RF4

Vulnerability from github – Published: 2024-09-27 15:30 – Updated: 2024-10-09 18:31

Details

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

userfaultfd: don't BUG_ON() if khugepaged yanks our page table

Since khugepaged was changed to allow retracting page tables in file mappings without holding the mmap lock, these BUG_ON()s are wrong - get rid of them.

We could also remove the preceding "if (unlikely(...))" block, but then we could reach pte_offset_map_lock() with transhuge pages not just for file mappings but also for anonymous mappings - which would probably be fine but I think is not necessarily expected.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-46838"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-27T13:15:15Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: don\u0027t BUG_ON() if khugepaged yanks our page table\n\nSince khugepaged was changed to allow retracting page tables in file\nmappings without holding the mmap lock, these BUG_ON()s are wrong - get\nrid of them.\n\nWe could also remove the preceding \"if (unlikely(...))\" block, but then we\ncould reach pte_offset_map_lock() with transhuge pages not just for file\nmappings but also for anonymous mappings - which would probably be fine\nbut I think is not necessarily expected.",
  "id": "GHSA-vq28-2hrg-3rf4",
  "modified": "2024-10-09T18:31:40Z",
  "published": "2024-09-27T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46838"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a594acc12d5954cdc71d4450a386748bf3d136a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db978287e908d48b209e374b00d847b2d785e0a9"
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-46838 (GCVE-0-2024-46838)

Vulnerability from cvelistv5 – Published: 2024-09-27 12:39 – Updated: 2025-05-04 09:35

Title

userfaultfd: don't BUG_ON() if khugepaged yanks our page table

Summary

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: don't BUG_ON() if khugepaged yanks our page table Since khugepaged was changed to allow retracting page tables in file mappings without holding the mmap lock, these BUG_ON()s are wrong - get rid of them. We could also remove the preceding "if (unlikely(...))" block, but then we could reach pte_offset_map_lock() with transhuge pages not just for file mappings but also for anonymous mappings - which would probably be fine but I think is not necessarily expected.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/4a594acc12d5954cd…
	https://git.kernel.org/stable/c/db978287e908d48b2…
	https://git.kernel.org/stable/c/4828d207dc5161dc7…

Impacted products

Vendor

Product

Version

Linux

Affected: 1d65b771bc08cd054cf6d3766a72e113dc46d62f , < 4a594acc12d5954cdc71d4450a386748bf3d136a (git)
Affected: 1d65b771bc08cd054cf6d3766a72e113dc46d62f , < db978287e908d48b209e374b00d847b2d785e0a9 (git)
Affected: 1d65b771bc08cd054cf6d3766a72e113dc46d62f , < 4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a (git)

Linux

Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.51 , ≤ 6.6.* (semver)
Unaffected: 6.10.10 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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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.

Action not permitted

GHSA-VQ28-2HRG-3RF4

CVE-2024-46838 (GCVE-0-2024-46838)

Tags

Sightings

Nomenclature