CVE-2022-50743 (GCVE-0-2022-50743)
Vulnerability from cvelistv5
Published
2025-12-24 13:05
Modified
2025-12-24 13:05
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: cecf864d3d76d50e3d9c58145e286a0b8c284e92
Version: cecf864d3d76d50e3d9c58145e286a0b8c284e92
Version: cecf864d3d76d50e3d9c58145e286a0b8c284e92
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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",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50743\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:01.020\",\"lastModified\":\"2025-12-24T13:16:01.020\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/618e712b99c78d1004b70a1a9ab0a4830d0b2673\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac54c1f7b288d83b6ba1e320efff24ecc21309cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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