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CVE-2022-50766

Estado: AplazadaSin puntuar—

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

btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer

syzbot is reporting uninit-value in btrfs_clean_tree_block() [1], for commit bc877d285ca3dba2 ("btrfs: Deduplicate extent_buffer init code") missed that btrfs_set_header_generation() in btrfs_init_new_buffer() must not be moved to after clean_tree_block() because clean_tree_block() is calling btrfs_header_generation() since commit 55c69072d6bd5be1 ("Btrfs: Fix extent_buffer usage when nodesize != leafsize").

Since memzero_extent_buffer() will reset "struct btrfs_header" part, we can't move btrfs_set_header_generation() to before memzero_extent_buffer(). Just re-add btrfs_set_header_generation() before btrfs_clean_tree_block().

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)

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{
  "id": "CVE-2022-50766",
  "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": "bc877d285ca3dba24c52406946a4a69847cc7422",
              "lessThan": "0a408c6212c16b9a2a1141d3c531247582ef8101",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bc877d285ca3dba24c52406946a4a69847cc7422",
              "lessThan": "a687c2890fe4a2acaac6941fa4097a1264d8f3eb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bc877d285ca3dba24c52406946a4a69847cc7422",
              "lessThan": "89bc41c92d10b905c60f6ec13c9ef664a3555c54",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bc877d285ca3dba24c52406946a4a69847cc7422",
              "lessThan": "cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/extent-tree.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver",
              "lessThanOrEqual": "5.19.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/extent-tree.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-24T13:16:03.400",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0a408c6212c16b9a2a1141d3c531247582ef8101",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/89bc41c92d10b905c60f6ec13c9ef664a3555c54",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a687c2890fe4a2acaac6941fa4097a1264d8f3eb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer\n\nsyzbot is reporting uninit-value in btrfs_clean_tree_block() [1], for\ncommit bc877d285ca3dba2 (\"btrfs: Deduplicate extent_buffer init code\")\nmissed that btrfs_set_header_generation() in btrfs_init_new_buffer() must\nnot be moved to after clean_tree_block() because clean_tree_block() is\ncalling btrfs_header_generation() since commit 55c69072d6bd5be1 (\"Btrfs:\nFix extent_buffer usage when nodesize != leafsize\").\n\nSince memzero_extent_buffer() will reset \"struct btrfs_header\" part, we\ncan't move btrfs_set_header_generation() to before memzero_extent_buffer().\nJust re-add btrfs_set_header_generation() before btrfs_clean_tree_block()."
    }
  ],
  "lastModified": "2026-06-17T05:24:08.477",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}