Vulnerability-Lookup

ubuntu-cve-2025-37818

Vulnerability from osv_ubuntu

Published

2025-05-08 07:15

Modified

2026-02-06 17:53

Summary

Details

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Return NULL from huge_pte_offset() for invalid PMD LoongArch's huge_pte_offset() currently returns a pointer to a PMD slot even if the underlying entry points to invalid_pte_table (indicating no mapping). Callers like smaps_hugetlb_range() fetch this invalid entry value (the address of invalid_pte_table) via this pointer. The generic is_swap_pte() check then incorrectly identifies this address as a swap entry on LoongArch, because it satisfies the "!pte_present() && !pte_none()" conditions. This misinterpretation, combined with a coincidental match by is_migration_entry() on the address bits, leads to kernel crashes in pfn_swap_entry_to_page(). Fix this at the architecture level by modifying huge_pte_offset() to check the PMD entry's content using pmd_none() before returning. If the entry is invalid (i.e., it points to invalid_pte_table), return NULL instead of the pointer to the slot.

Severity

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-37818	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-37818	REPORT
	https://git.kernel.org/linus/bd51834d1cf65a2c8012…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-buildinfo-6.14.0-1011-gcp-64k",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-gcp-6.14-headers-6.14.0-1011",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-gcp-6.14-tools-6.14.0-1011",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-headers-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-headers-6.14.0-1011-gcp-64k",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-6.14.0-1011-gcp-64k",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-lib-rust-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-modules-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-modules-6.14.0-1011-gcp-64k",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-modules-extra-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-modules-extra-6.14.0-1011-gcp-64k",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-tools-6.14.0-1011-gcp",
            "binary_version": "6.14.0-1011.11~24.04.1"
          },
          {
            "binary_name": "linux-tools-6.14.0-1011-gcp-64k",
            "binary_version": "6.14.0-1011.11~24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "linux-gcp-6.14",
        "purl": "pkg:deb/ubuntu/linux-gcp-6.14@6.14.0-1011.11~24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.14.0-1011.11~24.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.14.0-1007.7~24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-cloud-tools-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-headers-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-modules-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-modules-extra-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-modules-iwlwifi-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-realtime-6.14-cloud-tools-6.14.0-1010",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-realtime-6.14-headers-6.14.0-1010",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-realtime-6.14-tools-6.14.0-1010",
            "binary_version": "6.14.0-1010.10~24.04.1"
          },
          {
            "binary_name": "linux-tools-6.14.0-1010-realtime",
            "binary_version": "6.14.0-1010.10~24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:Realtime:24.04:LTS",
        "name": "linux-realtime-6.14",
        "purl": "pkg:deb/ubuntu/linux-realtime-6.14@6.14.0-1010.10~24.04.1?arch=source\u0026distro=realtime/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.14.0-1010.10~24.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.14.0-1003.3~24.04.3"
      ]
    }
  ],
  "aliases": [],
  "details": "In the Linux kernel, the following vulnerability has been resolved: LoongArch: Return NULL from huge_pte_offset() for invalid PMD LoongArch\u0027s huge_pte_offset() currently returns a pointer to a PMD slot even if the underlying entry points to invalid_pte_table (indicating no mapping). Callers like smaps_hugetlb_range() fetch this invalid entry value (the address of invalid_pte_table) via this pointer. The generic is_swap_pte() check then incorrectly identifies this address as a swap entry on LoongArch, because it satisfies the \"!pte_present() \u0026\u0026 !pte_none()\" conditions. This misinterpretation, combined with a coincidental match by is_migration_entry() on the address bits, leads to kernel crashes in pfn_swap_entry_to_page(). Fix this at the architecture level by modifying huge_pte_offset() to check the PMD entry\u0027s content using pmd_none() before returning. If the entry is invalid (i.e., it points to invalid_pte_table), return NULL instead of the pointer to the slot.",
  "id": "UBUNTU-CVE-2025-37818",
  "modified": "2026-02-06T17:53:23Z",
  "published": "2025-05-08T07:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-37818"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-37818"
    },
    {
      "type": "REPORT",
      "url": "https://git.kernel.org/linus/bd51834d1cf65a2c801295d230c220aeebf87a73"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-37818"
  ]
}

CVE-2025-37818 (GCVE-0-2025-37818)

Vulnerability from cvelistv5 – Published: 2025-05-08 06:26 – Updated: 2026-05-11 21:15

Title

LoongArch: Return NULL from huge_pte_offset() for invalid PMD

Summary

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/34256805720993e37…
https://git.kernel.org/stable/c/2ca9380b12711afe9…
https://git.kernel.org/stable/c/51424fd171cee6a33…
https://git.kernel.org/stable/c/b49f085cd671addbd…
https://git.kernel.org/stable/c/bd51834d1cf65a2c8…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < 34256805720993e37adf6127371a1265aea8376a (git) Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < 2ca9380b12711afe95b3589bd82b59623b3c96b3 (git) Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < 51424fd171cee6a33f01f7c66b8eb23ac42289d4 (git) Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < b49f085cd671addbda4802d6b9382513f7dd0f30 (git) Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < bd51834d1cf65a2c801295d230c220aeebf87a73 (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.136 , ≤ 6.1.* (semver) Unaffected: 6.6.89 , ≤ 6.6.* (semver) Unaffected: 6.12.26 , ≤ 6.12.* (semver) Unaffected: 6.14.5 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "programFiles": [
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.14.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73"
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      "title": "LoongArch: Return NULL from huge_pte_offset() for invalid PMD",
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    "cveId": "CVE-2025-37818",
    "datePublished": "2025-05-08T06:26:13.322Z",
    "dateReserved": "2025-04-16T04:51:23.947Z",
    "dateUpdated": "2026-05-11T21:15:44.270Z",
    "state": "PUBLISHED"
  },
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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.

Action not permitted

ubuntu-cve-2025-37818

Vulnerability from osv_ubuntu

CVE-2025-37818 (GCVE-0-2025-37818)

Tags

Sightings

Nomenclature