CVE-2022-48631

Local kernel crash via malformed ext4 extents

Published Apr 28, 2024 · Updated May 11, 2026

Improper input validation in Linux ext4 allows local users to crash the kernel via reads of malformed extent metadata. The __ext4_ext_check() path accepts an extent header with zero eh_entries at positive depth, so ext4_ext_binsearch_idx() derives garbage indexes. Reaching the defect requires local access to a crafted ext4 filesystem image; the demonstrated consequence is a kernel BUG and host service interruption.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux ext4 allows local users to crash the kernel via reads of malformed extent metadata. The __ext4_ext_check() path accepts an extent header with zero eh_entries at positive depth, so ext4_ext_binsearch_idx() derives garbage indexes. Reaching the defect requires local access to a crafted ext4 filesystem image; the demonstrated consequence is a kernel BUG and host service interruption.

The record

CVE
CVE-2022-48631
Published
Apr 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2024CVE 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=2.6.23
  2. Affected versionversion=c29c0ae7f282828da3695167ed870131798348d9 <29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0
  3. Affected versionversion=c29c0ae7f282828da3695167ed870131798348d9 <2f5e9de15e4f55fbf56f22d4a2ce406246cc462d
  4. Affected versionversion=c29c0ae7f282828da3695167ed870131798348d9 <958b0ee23f5ac106e7cc11472b71aa2ea9a033bc
  5. Affected versionversion=c29c0ae7f282828da3695167ed870131798348d9 <bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0
  6. Affected versionversion=c29c0ae7f282828da3695167ed870131798348d9 <be4df018c0be5ebecf1ca510feacc23be415cefc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.23; version=c29c0ae7f282828da3695167ed870131798348d9 <29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0; version=c29c0ae7f282828da3695167ed870131798348d9 <2f5e9de15e4f55fbf56f22d4a2ce406246cc462d; version=c29c0ae7f282828da3695167ed870131798348d9 <958b0ee23f5ac106e7cc11472b71aa2ea9a033bc; version=c29c0ae7f282828da3695167ed870131798348d9 <bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0; version=c29c0ae7f282828da3695167ed870131798348d9 <be4df018c0be5ebecf1ca510feacc23be415cefc

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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