Vulnerability-Lookup

GHSA-4RMV-8GM3-JWX2

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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

erofs: fix the out-of-bounds nameoff handling for trailing dirents

Currently we already have boundary-checks for nameoffs, but the trailing dirents are special since the namelens are calculated with strnlen() with unchecked nameoffs.

If a crafted EROFS has a trailing dirent with nameoff >= maxsize, maxsize - nameoff can underflow, causing strnlen() to read past the directory block.

nameoff0 should also be verified to be a multiple of sizeof(struct erofs_dirent) as well [1].

[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46078"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:29Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix the out-of-bounds nameoff handling for trailing dirents\n\nCurrently we already have boundary-checks for nameoffs, but the trailing\ndirents are special since the namelens are calculated with strnlen()\nwith unchecked nameoffs.\n\nIf a crafted EROFS has a trailing dirent with nameoff \u003e= maxsize,\nmaxsize - nameoff can underflow, causing strnlen() to read past the\ndirectory block.\n\nnameoff0 should also be verified to be a multiple of\n`sizeof(struct erofs_dirent)` as well [1].\n\n[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com",
  "id": "GHSA-4rmv-8gm3-jwx2",
  "modified": "2026-05-27T15:33:23Z",
  "published": "2026-05-27T15:33:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46078"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46078 (GCVE-0-2026-46078)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:58 – Updated: 2026-05-27 12:58

Title

erofs: fix the out-of-bounds nameoff handling for trailing dirents

Summary

In the Linux kernel, the following vulnerability has been resolved: erofs: fix the out-of-bounds nameoff handling for trailing dirents Currently we already have boundary-checks for nameoffs, but the trailing dirents are special since the namelens are calculated with strnlen() with unchecked nameoffs. If a crafted EROFS has a trailing dirent with nameoff >= maxsize, maxsize - nameoff can underflow, causing strnlen() to read past the directory block. nameoff0 should also be verified to be a multiple of `sizeof(struct erofs_dirent)` as well [1]. [1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/222055e6b4063abd2…
https://git.kernel.org/stable/c/48b27a955d22391c7…
https://git.kernel.org/stable/c/8ebb951a284b7446e…
https://git.kernel.org/stable/c/1d55445226c75ddd4…
https://git.kernel.org/stable/c/d18a3b5d337fa412a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3aa8ec716e52c02360457fa018296629b4d0becf , < 222055e6b4063abd2d9e13c3d49bbd1724c50789 (git) Affected: 3aa8ec716e52c02360457fa018296629b4d0becf , < 48b27a955d22391c7f30169fa7b6b2e1977f1ce4 (git) Affected: 3aa8ec716e52c02360457fa018296629b4d0becf , < 8ebb951a284b7446e025afc7dc5e9516ef9a7214 (git) Affected: 3aa8ec716e52c02360457fa018296629b4d0becf , < 1d55445226c75ddd4e78b09b3e7d99109b28c366 (git) Affected: 3aa8ec716e52c02360457fa018296629b4d0becf , < d18a3b5d337fa412a38e776e6b4b857a58836575 (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "48b27a955d22391c7f30169fa7b6b2e1977f1ce4",
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              "version": "3aa8ec716e52c02360457fa018296629b4d0becf",
              "versionType": "git"
            },
            {
              "lessThan": "8ebb951a284b7446e025afc7dc5e9516ef9a7214",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "1d55445226c75ddd4e78b09b3e7d99109b28c366",
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            {
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:58:11.916Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575"
        }
      ],
      "title": "erofs: fix the out-of-bounds nameoff handling for trailing dirents",
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46078",
    "datePublished": "2026-05-27T12:58:11.916Z",
    "dateReserved": "2026-05-13T15:03:33.096Z",
    "dateUpdated": "2026-05-27T12:58:11.916Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-4RMV-8GM3-JWX2

CVE-2026-46078 (GCVE-0-2026-46078)

Tags

Sightings

Nomenclature