Vulnerability-Lookup

GHSA-762Q-JQWQ-G847

Vulnerability from github – Published: 2024-08-12 15:30 – Updated: 2025-11-04 00:31

Details

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

mm: huge_memory: use !CONFIG_64BIT to relax huge page alignment on 32 bit machines

Yves-Alexis Perez reported commit 4ef9ad19e176 ("mm: huge_memory: don't force huge page alignment on 32 bit") didn't work for x86_32 [1]. It is because x86_32 uses CONFIG_X86_32 instead of CONFIG_32BIT.

!CONFIG_64BIT should cover all 32 bit machines.

[1] https://lore.kernel.org/linux-mm/CAHbLzkr1LwH3pcTgM+aGQ31ip2bKqiqEQ8=FQB+t2c3dhNKNHA@mail.gmail.com/

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-2024-42258"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-12T15:15:20Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: huge_memory: use !CONFIG_64BIT to relax huge page alignment on 32 bit machines\n\nYves-Alexis Perez reported commit 4ef9ad19e176 (\"mm: huge_memory: don\u0027t\nforce huge page alignment on 32 bit\") didn\u0027t work for x86_32 [1].  It is\nbecause x86_32 uses CONFIG_X86_32 instead of CONFIG_32BIT.\n\n!CONFIG_64BIT should cover all 32 bit machines.\n\n[1] https://lore.kernel.org/linux-mm/CAHbLzkr1LwH3pcTgM+aGQ31ip2bKqiqEQ8=FQB+t2c3dhNKNHA@mail.gmail.com/",
  "id": "GHSA-762q-jqwq-g847",
  "modified": "2025-11-04T00:31:11Z",
  "published": "2024-08-12T15:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42258"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e1f4efb8d6140b2ec79bf760c43e1fc186e8dfc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89f2914dd4b47d2fad3deef0d700f9526d98d11f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5c399fe433a115e9d3693169b5f357f3194af0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9592025000b3cf26c742f3505da7b83aedc26d5"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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-2024-42258 (GCVE-0-2024-42258)

Vulnerability from cvelistv5 – Published: 2024-08-12 14:16 – Updated: 2026-08-05 11:36

Title

mm: huge_memory: use !CONFIG_64BIT to relax huge page alignment on 32 bit machines

Summary

In the Linux kernel, the following vulnerability has been resolved: mm: huge_memory: use !CONFIG_64BIT to relax huge page alignment on 32 bit machines Yves-Alexis Perez reported commit 4ef9ad19e176 ("mm: huge_memory: don't force huge page alignment on 32 bit") didn't work for x86_32 [1]. It is because x86_32 uses CONFIG_X86_32 instead of CONFIG_32BIT. !CONFIG_64BIT should cover all 32 bit machines. [1] https://lore.kernel.org/linux-mm/CAHbLzkr1LwH3pcTgM+aGQ31ip2bKqiqEQ8=FQB+t2c3dhNKNHA@mail.gmail.com/

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 16:12 UTC

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/89f2914dd4b47d2fa…
https://git.kernel.org/stable/c/a5c399fe433a115e9…
https://git.kernel.org/stable/c/7e1f4efb8d6140b2e…
https://git.kernel.org/stable/c/d9592025000b3cf26…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 87632bc9ecff5ded93433bc0fca428019bdd1cfe , < 89f2914dd4b47d2fad3deef0d700f9526d98d11f (git) Affected: 6ea9aa8d97e6563676094cb35755884173269555 , < a5c399fe433a115e9d3693169b5f357f3194af0a (git) Affected: 4ef9ad19e17676b9ef071309bc62020e2373705d , < 7e1f4efb8d6140b2ec79bf760c43e1fc186e8dfc (git) Affected: 4ef9ad19e17676b9ef071309bc62020e2373705d , < d9592025000b3cf26c742f3505da7b83aedc26d5 (git) Affected: 7432376c913381c5f24d373a87ff629bbde94b47 (git) Affected: 6.1.81 , < 6.1.105 (semver) Affected: 6.7.6 , < 6.8 (semver)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.1.105 , ≤ 6.1.* (semver) Unaffected: 6.10.3 , ≤ 6.10.* (semver) Unaffected: 6.11 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-42258",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:12:53.509414Z",
                "version": "2.0.3"
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              "value": "AV:L - The flawed placement logic is reached only through local process address-space operations \u2014 `mmap(2)` for anonymous mappings \u22652MB and `execve(2)`/`ld.so` library loads on ext4/xfs/btrfs/fuse \u2014 with no network-facing input processing involved. An attacker needs local execution on the 32-bit target (i386 desktop/server, or ARM32-LPAE embedded/IoT/automotive controller).\nAC:L - The behaviour is fully deterministic with no race or memory-layout precondition: on any x86_32/ARM32 kernel with THP enabled (the Debian/Ubuntu i386 PAE default and common on ARM LPAE), every mapping \u22652MB is unconditionally rounded to a 2MB boundary, yielding a fixed, precomputable address. The attacker simply issues a large mmap or reads the predictable base of a large library.\nPR:L - Any ordinary unprivileged local user can allocate \u22652MB mappings and observe the zero-entropy 2MB-aligned placement, and can equally derive the now-deterministic library base addresses of other, more privileged processes. No capability, namespace, or administrative access is required.\nUI:N - No victim action is needed \u2014 the kernel applies the alignment automatically to every qualifying mapping in every process on the system, including long-running root daemons that are already mapped. The attacker acts entirely on their own.\nS:U - The weakened randomization and the address-space exhaustion are both confined to the same operating-system security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - With `mmap_rnd_bits` at the 32-bit default of 8, PMD alignment consumes every randomization bit, so ASLR is completely \u2014 not partially \u2014 defeated for all large mappings, exposing the exact address-space layout of arbitrary processes including setuid binaries and network daemons. This total loss of a core memory-confidentiality protection makes the contents of victim memory reliably locatable and disclosable, as the reporter demonstrated in the regreSSHion (CVE-2024-6387) context on i386.\nI:N - The defect only influences where mappings are placed; the padding arithmetic retains its overflow guards and the returned address stays inside the reserved region, so no out-of-bounds write, use-after-free, or other data-modification primitive arises from the flaw itself.\nA:H - Forcing 2MB alignment on the 2\u20133GB 32-bit user address space leaves multi-megabyte holes between mappings, and the resulting fragmentation was reported in practice as mmap failures and premature OOM on openSUSE i586 and Android compat workloads. On a 32-bit embedded or industrial controller this causes the primary workload to fail allocations and be OOM-killed, denying service."
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    "cveId": "CVE-2024-42258",
    "datePublished": "2024-08-12T14:16:13.227Z",
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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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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