Vulnerability-Lookup

GHSA-XQMQ-2P4J-99X8

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 unsigned underflow in z_erofs_lz4_handle_overlap()

Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array.

However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path.

Let's add an additional check to fix this for backporting.

Reproducible image (base64-encoded gzipped blob):

H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA=

$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45999"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:17Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()\n\nSome crafted images can have illegal (!partial_decoding \u0026\u0026\nm_llen \u003c m_plen) extents, and the LZ4 inplace decompression path\ncan be wrongly hit, but it cannot handle (outpages \u003c inpages)\nproperly: \"outpages - inpages\" wraps to a large value and\nthe subsequent rq-\u003eout[] access reads past the decompressed_pages\narray.\n\nHowever, such crafted cases can correctly result in a corruption\nreport in the normal LZ4 non-inplace path.\n\nLet\u0027s add an additional check to fix this for backporting.\n\nReproducible image (base64-encoded gzipped blob):\n\nH4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g\ndilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i\nPNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz\n2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w\nywAAAAAAAADwu14ATsEYtgBQAAA=\n\n$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt\n$ dd if=/mnt/data of=/dev/null bs=4096 count=1",
  "id": "GHSA-xqmq-2p4j-99x8",
  "modified": "2026-05-27T15:33:20Z",
  "published": "2026-05-27T15:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45999"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45999 (GCVE-0-2026-45999)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:55 – Updated: 2026-05-27 12:55

Title

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()

Summary

In the Linux kernel, the following vulnerability has been resolved: erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array. However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path. Let's add an additional check to fix this for backporting. Reproducible image (base64-encoded gzipped blob): H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA= $ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/43a878639b90e9721…
https://git.kernel.org/stable/c/f1374fa6e57fd8366…
https://git.kernel.org/stable/c/c9ce18e6bb2c467ec…
https://git.kernel.org/stable/c/bbbbb3f0d7864238a…
https://git.kernel.org/stable/c/21e161de2dc660b1b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 598162d050801e556750defff4ddab499e5d76ed , < 43a878639b90e9721ffa5eb616a7e6d8454adef3 (git) Affected: 598162d050801e556750defff4ddab499e5d76ed , < f1374fa6e57fd836623668d782ded9244cfd2938 (git) Affected: 598162d050801e556750defff4ddab499e5d76ed , < c9ce18e6bb2c467ec85756dc7989b547b7584fee (git) Affected: 598162d050801e556750defff4ddab499e5d76ed , < bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e (git) Affected: 598162d050801e556750defff4ddab499e5d76ed , < 21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 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/decompressor.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "43a878639b90e9721ffa5eb616a7e6d8454adef3",
              "status": "affected",
              "version": "598162d050801e556750defff4ddab499e5d76ed",
              "versionType": "git"
            },
            {
              "lessThan": "f1374fa6e57fd836623668d782ded9244cfd2938",
              "status": "affected",
              "version": "598162d050801e556750defff4ddab499e5d76ed",
              "versionType": "git"
            },
            {
              "lessThan": "c9ce18e6bb2c467ec85756dc7989b547b7584fee",
              "status": "affected",
              "version": "598162d050801e556750defff4ddab499e5d76ed",
              "versionType": "git"
            },
            {
              "lessThan": "bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e",
              "status": "affected",
              "version": "598162d050801e556750defff4ddab499e5d76ed",
              "versionType": "git"
            },
            {
              "lessThan": "21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab",
              "status": "affected",
              "version": "598162d050801e556750defff4ddab499e5d76ed",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "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": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.88",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc1",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()\n\nSome crafted images can have illegal (!partial_decoding \u0026\u0026\nm_llen \u003c m_plen) extents, and the LZ4 inplace decompression path\ncan be wrongly hit, but it cannot handle (outpages \u003c inpages)\nproperly: \"outpages - inpages\" wraps to a large value and\nthe subsequent rq-\u003eout[] access reads past the decompressed_pages\narray.\n\nHowever, such crafted cases can correctly result in a corruption\nreport in the normal LZ4 non-inplace path.\n\nLet\u0027s add an additional check to fix this for backporting.\n\nReproducible image (base64-encoded gzipped blob):\n\nH4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g\ndilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i\nPNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz\n2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w\nywAAAAAAAADwu14ATsEYtgBQAAA=\n\n$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt\n$ dd if=/mnt/data of=/dev/null bs=4096 count=1"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:55:53.846Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee"
        },
        {
          "url": "https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e"
        },
        {
          "url": "https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab"
        }
      ],
      "title": "erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45999",
    "datePublished": "2026-05-27T12:55:53.846Z",
    "dateReserved": "2026-05-13T15:03:33.091Z",
    "dateUpdated": "2026-05-27T12:55:53.846Z",
    "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-XQMQ-2P4J-99X8

CVE-2026-45999 (GCVE-0-2026-45999)

Tags

Sightings

Nomenclature