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CVE-2022-50743

Estado: AplazadaSin puntuar—

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

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.

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.

Detalles técnicos trazas, registros y código del informe original
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
    ...

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

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-50743",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "lessThan": "ac54c1f7b288d83b6ba1e320efff24ecc21309cd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "lessThan": "618e712b99c78d1004b70a1a9ab0a4830d0b2673",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cecf864d3d76d50e3d9c58145e286a0b8c284e92",
              "lessThan": "c42c0ffe81176940bd5dead474216b7198d77675",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-24T13:16:01.020",
  "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"
    }
  ],
  "vulnStatus": "Deferred",
  "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    [<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740\n    [<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580\n    [<ffffffff814bc0d6>] read_pages+0x86/0x3d0\n    ...\n\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map->m_pa = zero. This makes pcl->obj.index be\nzero although pcl is not a inline pcluster.\n\nThen following path adds refcount for grp, but the refcount won't 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's 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."
    }
  ],
  "lastModified": "2026-06-17T05:24:06.183",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}