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GHSA-X7FV-MVJX-M6C8

Vulnerability from github – Published: 2025-12-24 15:30 – Updated: 2025-12-24 15:30

Details

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

erofs: Fix pcluster memleak when its block address is zero

syzkaller reported a memleak: https://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed

unreferenced object 0xffff88811009c7f8 (size 136): ... backtrace: [] z_erofs_do_read_page+0x99b/0x1740 [] z_erofs_readahead+0x24e/0x580 [] read_pages+0x86/0x3d0 ...

syzkaller constructed a case: in z_erofs_register_pcluster(), ztailpacking = false and map->m_pa = zero. This makes pcl->obj.index be zero although pcl is not a inline pcluster.

Then following path adds refcount for grp, but the refcount won't be put because pcl is inline.

z_erofs_readahead() z_erofs_do_read_page() # for another page z_erofs_collector_begin() erofs_find_workgroup() erofs_workgroup_get()

Since it's illegal for the block address of a non-inlined pcluster to be zero, add check here to avoid registering the pcluster which would be leaked.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50743"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T13:16:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix pcluster memleak when its block address is zero\n\nsyzkaller reported a memleak:\nhttps://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed\n\nunreferenced object 0xffff88811009c7f8 (size 136):\n  ...\n  backtrace:\n    [\u003cffffffff821db19b\u003e] z_erofs_do_read_page+0x99b/0x1740\n    [\u003cffffffff821dee9e\u003e] z_erofs_readahead+0x24e/0x580\n    [\u003cffffffff814bc0d6\u003e] read_pages+0x86/0x3d0\n    ...\n\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map-\u003em_pa = zero. This makes pcl-\u003eobj.index be\nzero although pcl is not a inline pcluster.\n\nThen following path adds refcount for grp, but the refcount won\u0027t be put\nbecause pcl is inline.\n\nz_erofs_readahead()\n  z_erofs_do_read_page() # for another page\n    z_erofs_collector_begin()\n      erofs_find_workgroup()\n        erofs_workgroup_get()\n\nSince it\u0027s illegal for the block address of a non-inlined pcluster to\nbe zero, add check here to avoid registering the pcluster which would\nbe leaked.",
  "id": "GHSA-x7fv-mvjx-m6c8",
  "modified": "2025-12-24T15:30:33Z",
  "published": "2025-12-24T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50743"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/618e712b99c78d1004b70a1a9ab0a4830d0b2673"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac54c1f7b288d83b6ba1e320efff24ecc21309cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2022-50743 (GCVE-0-2022-50743)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-05-11 19:24

Title

erofs: Fix pcluster memleak when its block address is zero

Summary

In the Linux kernel, the following vulnerability has been resolved: erofs: Fix pcluster memleak when its block address is zero syzkaller reported a memleak: https://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed unreferenced object 0xffff88811009c7f8 (size 136): ... backtrace: [<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740 [<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580 [<ffffffff814bc0d6>] read_pages+0x86/0x3d0 ... syzkaller constructed a case: in z_erofs_register_pcluster(), ztailpacking = false and map->m_pa = zero. This makes pcl->obj.index be zero although pcl is not a inline pcluster. Then following path adds refcount for grp, but the refcount won't be put because pcl is inline. z_erofs_readahead() z_erofs_do_read_page() # for another page z_erofs_collector_begin() erofs_find_workgroup() erofs_workgroup_get() Since it's illegal for the block address of a non-inlined pcluster to be zero, add check here to avoid registering the pcluster which would be leaked.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ac54c1f7b288d83b6…
https://git.kernel.org/stable/c/618e712b99c78d100…
https://git.kernel.org/stable/c/c42c0ffe81176940b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < ac54c1f7b288d83b6ba1e320efff24ecc21309cd (git) Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < 618e712b99c78d1004b70a1a9ab0a4830d0b2673 (git) Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < c42c0ffe81176940bd5dead474216b7198d77675 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.0.16 , ≤ 6.0.* (semver) Unaffected: 6.1.2 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/erofs/zdata.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "versionType": "git"
            },
            {
              "lessThan": "618e712b99c78d1004b70a1a9ab0a4830d0b2673",
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "versionType": "git"
            },
            {
              "lessThan": "c42c0ffe81176940bd5dead474216b7198d77675",
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "versionType": "git"
            }
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
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              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                }
              ],
              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix pcluster memleak when its block address is zero\n\nsyzkaller reported a memleak:\nhttps://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed\n\nunreferenced object 0xffff88811009c7f8 (size 136):\n  ...\n  backtrace:\n    [\u003cffffffff821db19b\u003e] z_erofs_do_read_page+0x99b/0x1740\n    [\u003cffffffff821dee9e\u003e] z_erofs_readahead+0x24e/0x580\n    [\u003cffffffff814bc0d6\u003e] read_pages+0x86/0x3d0\n    ...\n\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map-\u003em_pa = zero. This makes pcl-\u003eobj.index be\nzero although pcl is not a inline pcluster.\n\nThen following path adds refcount for grp, but the refcount won\u0027t be put\nbecause pcl is inline.\n\nz_erofs_readahead()\n  z_erofs_do_read_page() # for another page\n    z_erofs_collector_begin()\n      erofs_find_workgroup()\n        erofs_workgroup_get()\n\nSince it\u0027s illegal for the block address of a non-inlined pcluster to\nbe zero, add check here to avoid registering the pcluster which would\nbe leaked."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:24:39.573Z",
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        {
          "url": "https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675"
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      "title": "erofs: Fix pcluster memleak when its block address is zero",
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    "datePublished": "2025-12-24T13:05:40.297Z",
    "dateReserved": "2025-12-24T13:02:21.543Z",
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    "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.
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