Vulnerability-Lookup

GHSA-VJW4-HV65-7VHQ

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:

ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access

The bounds check for the next xattr entry in check_xattrs() uses (void )next >= end, which allows next to point within sizeof(u32) bytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4 bytes via (__u32 *)(entry), which can overrun the valid xattr region.

For example, if next lands at end - 1, the check passes since next < end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1, accessing 3 bytes beyond the valid region.

Fix this by changing the check to (void *)next + sizeof(u32) > end, ensuring there is always enough space for the IS_LAST_ENTRY() read on the subsequent iteration.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46094"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bounds check in check_xattrs() to prevent out-of-bounds access\n\nThe bounds check for the next xattr entry in check_xattrs() uses\n(void *)next \u003e= end, which allows next to point within sizeof(u32)\nbytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4\nbytes via *(__u32 *)(entry), which can overrun the valid xattr region.\n\nFor example, if next lands at end - 1, the check passes since\nnext \u003c end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1,\naccessing 3 bytes beyond the valid region.\n\nFix this by changing the check to (void *)next + sizeof(u32) \u003e end,\nensuring there is always enough space for the IS_LAST_ENTRY() read\non the subsequent iteration.",
  "id": "GHSA-vjw4-hv65-7vhq",
  "modified": "2026-05-27T15:33:24Z",
  "published": "2026-05-27T15:33:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46094"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/520986722dbf869c122252123fc161c7302eab7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/537e065977022aa22f2c2503e8accaf16622e0fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a5314d2387633a272a04d1bd8727f99058e4e68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab6da97bc310db35d4e4ef5354bc3ff626b0698c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eceafc31ea7b42c984ece10d79d505c0bb6615d5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46094 (GCVE-0-2026-46094)

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

Title

ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access The bounds check for the next xattr entry in check_xattrs() uses (void *)next >= end, which allows next to point within sizeof(u32) bytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4 bytes via *(__u32 *)(entry), which can overrun the valid xattr region. For example, if next lands at end - 1, the check passes since next < end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1, accessing 3 bytes beyond the valid region. Fix this by changing the check to (void *)next + sizeof(u32) > end, ensuring there is always enough space for the IS_LAST_ENTRY() read on the subsequent iteration.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/ab6da97bc310db35d…
https://git.kernel.org/stable/c/5a5314d2387633a27…
https://git.kernel.org/stable/c/537e065977022aa22…
https://git.kernel.org/stable/c/520986722dbf869c1…
https://git.kernel.org/stable/c/eceafc31ea7b42c98…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < ab6da97bc310db35d4e4ef5354bc3ff626b0698c (git) Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < 5a5314d2387633a272a04d1bd8727f99058e4e68 (git) Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < 537e065977022aa22f2c2503e8accaf16622e0fd (git) Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < 520986722dbf869c122252123fc161c7302eab7d (git) Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < eceafc31ea7b42c984ece10d79d505c0bb6615d5 (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (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/ext4/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "3478c83cf26bbffd026ae6a56bcb1fe544f0834e",
              "versionType": "git"
            },
            {
              "lessThan": "5a5314d2387633a272a04d1bd8727f99058e4e68",
              "status": "affected",
              "version": "3478c83cf26bbffd026ae6a56bcb1fe544f0834e",
              "versionType": "git"
            },
            {
              "lessThan": "537e065977022aa22f2c2503e8accaf16622e0fd",
              "status": "affected",
              "version": "3478c83cf26bbffd026ae6a56bcb1fe544f0834e",
              "versionType": "git"
            },
            {
              "lessThan": "520986722dbf869c122252123fc161c7302eab7d",
              "status": "affected",
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            },
            {
              "lessThan": "eceafc31ea7b42c984ece10d79d505c0bb6615d5",
              "status": "affected",
              "version": "3478c83cf26bbffd026ae6a56bcb1fe544f0834e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
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              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "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:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
                {
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                }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bounds check in check_xattrs() to prevent out-of-bounds access\n\nThe bounds check for the next xattr entry in check_xattrs() uses\n(void *)next \u003e= end, which allows next to point within sizeof(u32)\nbytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4\nbytes via *(__u32 *)(entry), which can overrun the valid xattr region.\n\nFor example, if next lands at end - 1, the check passes since\nnext \u003c end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1,\naccessing 3 bytes beyond the valid region.\n\nFix this by changing the check to (void *)next + sizeof(u32) \u003e end,\nensuring there is always enough space for the IS_LAST_ENTRY() read\non the subsequent iteration."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:58:45.304Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab6da97bc310db35d4e4ef5354bc3ff626b0698c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a5314d2387633a272a04d1bd8727f99058e4e68"
        },
        {
          "url": "https://git.kernel.org/stable/c/537e065977022aa22f2c2503e8accaf16622e0fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/520986722dbf869c122252123fc161c7302eab7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/eceafc31ea7b42c984ece10d79d505c0bb6615d5"
        }
      ],
      "title": "ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46094",
    "datePublished": "2026-05-27T12:58:45.304Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-05-27T12:58:45.304Z",
    "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.

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GHSA-VJW4-HV65-7VHQ

CVE-2026-46094 (GCVE-0-2026-46094)

Tags

Sightings

Nomenclature