btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer

{
  "id": "c495674fec0a329a0deacbfa710dbc3f6acd479063d84f581b8b0588224d9000",
  "url": "https://osv.dev/vulnerability/CVE-2022-50766",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer",
    "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().",
    "evidence": "osv:CVE-2022-50766",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.75",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.19.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50766",
      "aliases": [
        "CVE-2022-50766"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "bc877d285ca3dba24c52406946a4a69847cc7422"
                },
                {
                  "fixed": "0a408c6212c16b9a2a1141d3c531247582ef8101"
                },
                {
                  "fixed": "a687c2890fe4a2acaac6941fa4097a1264d8f3eb"
                },
                {
                  "fixed": "89bc41c92d10b905c60f6ec13c9ef664a3555c54"
                },
                {
                  "fixed": "cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50766.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.19.0"
                },
                {
                  "fixed": "5.15.75"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.19.17"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.20.0"
                },
                {
                  "fixed": "6.0.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50766.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.819064578Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a408c6212c16b9a2a1141d3c531247582ef8101",
        "https://git.kernel.org/stable/c/89bc41c92d10b905c60f6ec13c9ef664a3555c54",
        "https://git.kernel.org/stable/c/a687c2890fe4a2acaac6941fa4097a1264d8f3eb",
        "https://git.kernel.org/stable/c/cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50766.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50766",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50766.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50766",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505359,
  "published_at": "2025-12-24T13:05:56.873+00:00"
}