CVE-2022-50766 (GCVE-0-2022-50766)
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: 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().
References
Impacted products
Vendor Product Version
Linux Linux Version: bc877d285ca3dba24c52406946a4a69847cc7422
Version: bc877d285ca3dba24c52406946a4a69847cc7422
Version: bc877d285ca3dba24c52406946a4a69847cc7422
Version: bc877d285ca3dba24c52406946a4a69847cc7422
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/extent-tree.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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            },
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.19.17",
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                  "vulnerable": true
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                  "versionEndExcluding": "6.0.3",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027t move btrfs_set_header_generation() to before memzero_extent_buffer().\nJust re-add btrfs_set_header_generation() before btrfs_clean_tree_block()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:05:56.873Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0a408c6212c16b9a2a1141d3c531247582ef8101"
        },
        {
          "url": "https://git.kernel.org/stable/c/a687c2890fe4a2acaac6941fa4097a1264d8f3eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/89bc41c92d10b905c60f6ec13c9ef664a3555c54"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38"
        }
      ],
      "title": "btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50766",
    "datePublished": "2025-12-24T13:05:56.873Z",
    "dateReserved": "2025-12-24T13:02:21.546Z",
    "dateUpdated": "2025-12-24T13:05:56.873Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50766\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:03.400\",\"lastModified\":\"2025-12-24T13:16:03.400\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\u0027t move btrfs_set_header_generation() to before memzero_extent_buffer().\\nJust re-add btrfs_set_header_generation() before btrfs_clean_tree_block().\"}],\"metrics\":{},\"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\"}]}}"
  }
}


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