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NVD / CVE Program· CNA Linux

CVE-2022-50766: btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 0a408c6212c16b9a2a1141d3c531247582ef8101, 89bc41c92d10b905c60f6ec13c9ef664a3555c54, a687c2890fe4a2acaac6941fa4097a1264d8f3eb.

Low priority for now. Upgrade to Linux Linux 0a408c6212c16b9a2a1141d3c531247582ef8101, 89bc41c92d10b905c60f6ec13c9ef664a3555c54, a687c2890fe4a2acaac6941fa4097a1264d8f3eb or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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().

—No exploit Fix available
Published
Dec 24, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 14th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.19affected
    • bc877d285ca3dba24c52406946a4a69847cc7422 and later · before 0a408c6212c16b9a2a1141d3c531247582ef8101affected · git
    • bc877d285ca3dba24c52406946a4a69847cc7422 and later · before a687c2890fe4a2acaac6941fa4097a1264d8f3ebaffected · git
    • bc877d285ca3dba24c52406946a4a69847cc7422 and later · before 89bc41c92d10b905c60f6ec13c9ef664a3555c54affected · git
    • bc877d285ca3dba24c52406946a4a69847cc7422 and later · before cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38affected · git
    • before 4.19not affected · semver
    • 5.15.75 and later · up to and including 5.15.*not affected · semver
    • 5.19.17 and later · up to and including 5.19.*not affected · semver
    • 6.0.3 and later · up to and including 6.0.*not affected · semver
    • 6.1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.3-16.0.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-50764Dec 24, 2025 · ipv6/sit: use DEV_STATS_INC() to avoid data-races
    0Monitor
  • ← EarlierCVE-2022-50765Dec 24, 2025 · RISC-V: kexec: Fix memory leak of elf header buffer
    0Monitor
  • Later →CVE-2022-50767Dec 24, 2025 · fbdev: smscufx: Fix several use-after-free bugs
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0a408c6212c16b9a2a1141d3c531247582ef8101Vendor (CNA)
Linux Linux89bc41c92d10b905c60f6ec13c9ef664a3555c54Vendor (CNA)
Linux Linuxa687c2890fe4a2acaac6941fa4097a1264d8f3ebVendor (CNA)
Linux Linuxcbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38Vendor (CNA)
debian:linux6.0.3-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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