CVE-2022-49327

System hang via exhausted bcache journal buckets

Published Feb 26, 2025 · Updated May 11, 2026

Improper locking in Linux bcache before 5.19 allows local users to hang cache-set registration during journal replay. When active journal buckets are full, a replayed bkey that splits a btree node can request journal metadata while reclamation waits for replay progress. Exploitation requires local access, sustained heavy write I/O, and cache-set registration after a reboot; the bounded consequence is a storage-service hang.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux bcache before 5.19 allows local users to hang cache-set registration during journal replay. When active journal buckets are full, a replayed bkey that splits a btree node can request journal metadata while reclamation waits for replay progress. Exploitation requires local access, sustained heavy write I/O, and cache-set registration after a reboot; the bounded consequence is a storage-service hang.

The record

CVE
CVE-2022-49327
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.10
  2. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <1dda32aed6f62c163f38ff947ef5b3360e329159
  3. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <32feee36c30ea06e38ccb8ae6e5c44c6eec790a6
  4. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <5607652823ac65e2c6885e73bd46d5a4f9a20363
  5. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <59afd4f287900c8187e968a4153ed35e6b48efce
  6. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <6332ea3e35efa12dc08f0cbf5faea5e6e8eb0497

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.10; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <1dda32aed6f62c163f38ff947ef5b3360e329159; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <32feee36c30ea06e38ccb8ae6e5c44c6eec790a6; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <5607652823ac65e2c6885e73bd46d5a4f9a20363; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <59afd4f287900c8187e968a4153ed35e6b48efce; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <6332ea3e35efa12dc08f0cbf5faea5e6e8eb0497

Published CVSS scores

5.5CISA ADPCVSS: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application 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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