CVE-2022-49898

Kernel panic via reallocated-node replay

Published May 1, 2025 · Updated Aug 5, 2026

Denial of service in Linux 3.5 through 6.0.7 allows local users to trigger a kernel panic through concurrent btrfs file operations. tree_mod_log_oldest_root selects an unrelated KEY_REPLACE after a freed node is reallocated, causing tree_mod_log_rewind to replay operations from the wrong block incarnation and hit BUG_ON. Reachability requires a mounted btrfs filesystem and concurrent metadata changes while a readable file is queried, and the demonstrated consequence is a host crash.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux 3.5 through 6.0.7 allows local users to trigger a kernel panic through concurrent btrfs file operations. tree_mod_log_oldest_root selects an unrelated KEY_REPLACE after a freed node is reallocated, causing tree_mod_log_rewind to replay operations from the wrong block incarnation and hit BUG_ON. Reachability requires a mounted btrfs filesystem and concurrent metadata changes while a readable file is queried, and the demonstrated consequence is a host crash.

The record

CVE
CVE-2022-49898
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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=3.5
  2. Affected versionversion=bd989ba359f2acb8bc5f5490e19010fc0a6f8356 <007058eb8292efc4c88f921752194b83269da085
  3. Affected versionversion=bd989ba359f2acb8bc5f5490e19010fc0a6f8356 <52b2b65c9eb56fd829dda323786db828627ff7e6
  4. Affected versionversion=bd989ba359f2acb8bc5f5490e19010fc0a6f8356 <968b71583130b6104c9f33ba60446d598e327a8b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=bd989ba359f2acb8bc5f5490e19010fc0a6f8356 <007058eb8292efc4c88f921752194b83269da085; version=bd989ba359f2acb8bc5f5490e19010fc0a6f8356 <52b2b65c9eb56fd829dda323786db828627ff7e6; version=bd989ba359f2acb8bc5f5490e19010fc0a6f8356 <968b71583130b6104c9f33ba60446d598e327a8b

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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