CVE-2022-49170

Kernel memory corruption via unchecked allocation type

Published Feb 26, 2025 · Updated Aug 12, 2026

Improper array-index validation in Linux F2FS allows local users to corrupt kernel memory by operating on a crafted filesystem image. F2FS copies an unchecked checkpoint alloc_type byte into curseg_info, then uses it to increment an entry beyond the two-element sbi->block_count array. After the image is mounted, ordinary write, sync, or unmount operations can repeat the invalid increment, exposing kernel data, corrupting state, or crashing the host.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in Linux F2FS allows local users to corrupt kernel memory by operating on a crafted filesystem image. F2FS copies an unchecked checkpoint alloc_type byte into curseg_info, then uses it to increment an entry beyond the two-element sbi->block_count array. After the image is mounted, ordinary write, sync, or unmount operations can repeat the invalid increment, exposing kernel data, corrupting state, or crashing the host.

The record

CVE
CVE-2022-49170
Published
Feb 26, 2025
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=351df4b201157351c7d26bf12c3eeb9dbce98854 <0748a0f7dcb9d9dddc80302d73ebcecef6782ef0
  2. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <498b7088db71f9707359448cd6800bbb1882f4c3
  3. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <c12765e3f129b144421c80d3383df885f85ee290
  4. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <f41ee8b91c00770d718be2ff4852a80017ae9ab3
  5. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <f68caedf264a95c0b02dfd0d9f92ac2637d5848a
  6. Affected versionversion=3.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <0748a0f7dcb9d9dddc80302d73ebcecef6782ef0; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <498b7088db71f9707359448cd6800bbb1882f4c3; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <c12765e3f129b144421c80d3383df885f85ee290; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <f41ee8b91c00770d718be2ff4852a80017ae9ab3; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <f68caedf264a95c0b02dfd0d9f92ac2637d5848a; version=3.8

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS: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-129Improper Validation of Array Index
T1068Exploitation for Privilege Escalation

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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