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

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-05-11 19:24
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < ac54c1f7b288d83b6ba1e320efff24ecc21309cd (git)
Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < 618e712b99c78d1004b70a1a9ab0a4830d0b2673 (git)
Affected: cecf864d3d76d50e3d9c58145e286a0b8c284e92 , < c42c0ffe81176940bd5dead474216b7198d77675 (git)
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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",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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                  "vulnerable": true
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                  "versionEndExcluding": "6.1.2",
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                },
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                  "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": "2026-05-11T19:24:39.573Z",
        "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": "2026-05-11T19:24:39.573Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50743",
      "date": "2026-09-14",
      "epss": "0.00232",
      "percentile": "0.14082"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
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      "cve": "CVE-2022-50743",
      "id": "CVE-2022-50743",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "22",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in erofs due to memory leak",
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      "version": "3"
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      "current_release_date": "2026-09-03T16:56:23Z",
      "cve": "CVE-2022-50743",
      "id": "CVE-2022-50743",
      "initial_release_date": "2025-12-25T01:04:24Z",
      "product_status:known_not_affected": "560",
      "product_status:recommended": "43",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50743",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50743.json",
      "version": "12"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.