CVE-2022-49078

Kernel memory disclosure via malformed EROFS data

Published Feb 26, 2025 · Updated Aug 5, 2026

Out-of-bounds read in Linux kernel 4.20 and later affected branches allows local users to expose kernel memory via a crafted EROFS image. LZ4_decompress_safe_partial fails to stop before reading a following match offset when partial decoding has reached the input boundary. The crafted EROFS image must already be mounted; reading its compressed file can disclose adjacent memory, corrupt kernel state, or crash the host.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux kernel 4.20 and later affected branches allows local users to expose kernel memory via a crafted EROFS image. LZ4_decompress_safe_partial fails to stop before reading a following match offset when partial decoding has reached the input boundary. The crafted EROFS image must already be mounted; reading its compressed file can disclose adjacent memory, corrupt kernel state, or crash the host.

The record

CVE
CVE-2022-49078
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=2209fda323e2fd2a2d0885595fd5097717f8d2aa <467d5e200ab4486b744fe1776154a43d1aa22d4b
  2. Affected versionversion=2209fda323e2fd2a2d0885595fd5097717f8d2aa <6adc01a7aa37445dafe8846faa0610a86029b253
  3. Affected versionversion=2209fda323e2fd2a2d0885595fd5097717f8d2aa <73953dfa9d50e5c9fe98ee13fd1d3427aa12a0a3
  4. Affected versionversion=2209fda323e2fd2a2d0885595fd5097717f8d2aa <9fb8bc6cfc58773ce95414e11c9ccc8fc6ac4927
  5. Affected versionversion=2209fda323e2fd2a2d0885595fd5097717f8d2aa <e64dbe97c05c769525cbca099ddbd22485630235
  6. Affected versionversion=2209fda323e2fd2a2d0885595fd5097717f8d2aa <eafc0a02391b7b36617b36c97c4b5d6832cf5e24
  7. Affected versionversion=4.20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2209fda323e2fd2a2d0885595fd5097717f8d2aa <467d5e200ab4486b744fe1776154a43d1aa22d4b; version=2209fda323e2fd2a2d0885595fd5097717f8d2aa <6adc01a7aa37445dafe8846faa0610a86029b253; version=2209fda323e2fd2a2d0885595fd5097717f8d2aa <73953dfa9d50e5c9fe98ee13fd1d3427aa12a0a3; version=2209fda323e2fd2a2d0885595fd5097717f8d2aa <9fb8bc6cfc58773ce95414e11c9ccc8fc6ac4927; version=2209fda323e2fd2a2d0885595fd5097717f8d2aa <e64dbe97c05c769525cbca099ddbd22485630235; version=2209fda323e2fd2a2d0885595fd5097717f8d2aa <eafc0a02391b7b36617b36c97c4b5d6832cf5e24; version=4.20

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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