CVE-2022-50766

Unspecified impact via uninitialized header-generation read

Published Dec 24, 2025 · Updated Dec 24, 2025

An uninitialized-value read in the Linux btrfs tree-buffer initialization path allows attackers to cause unspecified impact via unspecified vectors. In btrfs_init_new_buffer(), memzero_extent_buffer() clears struct btrfs_header, but btrfs_clean_tree_block() reads its generation before btrfs_set_header_generation() initializes it. The public record establishes only a KMSAN-detected kernel read during tree-block allocation; it identifies neither an attacker-controlled trigger nor a security consequence beyond the uninitialized read.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An uninitialized-value read in the Linux btrfs tree-buffer initialization path allows attackers to cause unspecified impact via unspecified vectors. In btrfs_init_new_buffer(), memzero_extent_buffer() clears struct btrfs_header, but btrfs_clean_tree_block() reads its generation before btrfs_set_header_generation() initializes it. The public record establishes only a KMSAN-detected kernel read during tree-block allocation; it identifies neither an attacker-controlled trigger nor a security consequence beyond the uninitialized read.

The record

CVE
CVE-2022-50766
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.19
  2. Affected versionversion=bc877d285ca3dba24c52406946a4a69847cc7422 <0a408c6212c16b9a2a1141d3c531247582ef8101
  3. Affected versionversion=bc877d285ca3dba24c52406946a4a69847cc7422 <89bc41c92d10b905c60f6ec13c9ef664a3555c54
  4. Affected versionversion=bc877d285ca3dba24c52406946a4a69847cc7422 <a687c2890fe4a2acaac6941fa4097a1264d8f3eb
  5. Affected versionversion=bc877d285ca3dba24c52406946a4a69847cc7422 <cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=bc877d285ca3dba24c52406946a4a69847cc7422 <0a408c6212c16b9a2a1141d3c531247582ef8101; version=bc877d285ca3dba24c52406946a4a69847cc7422 <89bc41c92d10b905c60f6ec13c9ef664a3555c54; version=bc877d285ca3dba24c52406946a4a69847cc7422 <a687c2890fe4a2acaac6941fa4097a1264d8f3eb; version=bc877d285ca3dba24c52406946a4a69847cc7422 <cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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