CVE-2022-49526Public exploit

Kernel crash via invalid clustered bitmap metadata

Published Feb 26, 2025 · Updated May 11, 2026

Improper bitmap validation in Linux 3.5 through 5.18.2 allows local users to crash a clustered-md host via malformed metadata. md_bitmap_read_sb assigns a zero chunk size despite rejecting bad bitmap magic, causing md_bitmap_create to divide by zero while loading another cluster slot. The failure requires a clustered RAID array and the ability to corrupt its on-disk bitmap metadata; non-clustered arrays handle invalid metadata in userspace.

CVSS severity5.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper bitmap validation in Linux 3.5 through 5.18.2 allows local users to crash a clustered-md host via malformed metadata. md_bitmap_read_sb assigns a zero chunk size despite rejecting bad bitmap magic, causing md_bitmap_create to divide by zero while loading another cluster slot. The failure requires a clustered RAID array and the ability to corrupt its on-disk bitmap metadata; non-clustered arrays handle invalid metadata in userspace.

The record

CVE
CVE-2022-49526
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
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

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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=ef99bf480de9bde9d3b2afdf05324670fab4e571 <0959aa00f9765bd8c654b1365012e41b51c733cc
  3. Affected versionversion=ef99bf480de9bde9d3b2afdf05324670fab4e571 <27f672af28a8e9b783ff7f0eaf7ef2fbd5a2f4ba
  4. Affected versionversion=ef99bf480de9bde9d3b2afdf05324670fab4e571 <422e8f7ba1e08c8e0e88d375bcb550bc2bbfe96d
  5. Affected versionversion=ef99bf480de9bde9d3b2afdf05324670fab4e571 <cf9392282a2cf5a8d83dd1c5aa1a097e12f172bc
  6. Affected versionversion=ef99bf480de9bde9d3b2afdf05324670fab4e571 <d8f1558e1daf54f53a90b4c5700ae3e3a4b13412
  7. Affected versionversion=ef99bf480de9bde9d3b2afdf05324670fab4e571 <e68cb83a57a458b01c9739e2ad9cb70b04d1e6d2
  8. Affected versionversion=ef99bf480de9bde9d3b2afdf05324670fab4e571 <e69e93120f6219b9cc4fba3b515b6ababd8548aa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <0959aa00f9765bd8c654b1365012e41b51c733cc; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <27f672af28a8e9b783ff7f0eaf7ef2fbd5a2f4ba; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <422e8f7ba1e08c8e0e88d375bcb550bc2bbfe96d; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <cf9392282a2cf5a8d83dd1c5aa1a097e12f172bc; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <d8f1558e1daf54f53a90b4c5700ae3e3a4b13412; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <e68cb83a57a458b01c9739e2ad9cb70b04d1e6d2; version=ef99bf480de9bde9d3b2afdf05324670fab4e571 <e69e93120f6219b9cc4fba3b515b6ababd8548aa

Published CVSS scores

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 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 exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

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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