github - ghsa-x7fv-mvjx-m6c8

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: 2025-12-24 13:05

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

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

Vendor

Product

Version

Linux

Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < ac54c1f7b288d83b6ba1e320efff24ecc21309cd (git)
Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < 618e712b99c78d1004b70a1a9ab0a4830d0b2673 (git)
Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < c42c0ffe81176940bd5dead474216b7198d77675 (git)

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)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ac54c1f7b288d83b6ba1e320efff24ecc21309cd",
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "versionType": "git"
            },
            {
              "lessThan": "618e712b99c78d1004b70a1a9ab0a4830d0b2673",
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "versionType": "git"
            },
            {
              "lessThan": "c42c0ffe81176940bd5dead474216b7198d77675",
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "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": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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": "2025-12-24T13:05:40.297Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ac54c1f7b288d83b6ba1e320efff24ecc21309cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/618e712b99c78d1004b70a1a9ab0a4830d0b2673"
        },
        {
          "url": "https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675"
        }
      ],
      "title": "erofs: Fix pcluster memleak when its block address is zero",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50743",
    "datePublished": "2025-12-24T13:05:40.297Z",
    "dateReserved": "2025-12-24T13:02:21.543Z",
    "dateUpdated": "2025-12-24T13:05:40.297Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-X7FV-MVJX-M6C8

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

Tags

Sightings

Nomenclature