CVE-2022-50766 (GCVE-0-2022-50766)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-05-11 19:25
VLAI
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bc877d285ca3dba24c52406946a4a69847cc7422 , < 0a408c6212c16b9a2a1141d3c531247582ef8101 (git)
Affected: bc877d285ca3dba24c52406946a4a69847cc7422 , < a687c2890fe4a2acaac6941fa4097a1264d8f3eb (git)
Affected: bc877d285ca3dba24c52406946a4a69847cc7422 , < 89bc41c92d10b905c60f6ec13c9ef664a3555c54 (git)
Affected: bc877d285ca3dba24c52406946a4a69847cc7422 , < cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "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()."
        }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38"
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      "title": "btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50766",
    "datePublished": "2025-12-24T13:05:56.873Z",
    "dateReserved": "2025-12-24T13:02:21.546Z",
    "dateUpdated": "2026-05-11T19:25:07.774Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T10:36:43+00:00",
      "cve": "CVE-2022-50766",
      "id": "CVE-2022-50766",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50766.json",
      "version": "3"
    }
  }
}



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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.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.