CVE-2022-3649

System crash via corrupted NILFS2 inode bitmap

Published Oct 21, 2022 · Updated Aug 3, 2024

Use-after-free in the Linux Kernel NILFS2 implementation allows local users to crash the system by mounting a corrupted filesystem image. nilfs_new_inode() can allocate a reserved root inode from an inconsistent bitmap, after which nilfs_clear_inode() wrongly decrements and frees the nilfs_root object. A user permitted to mount arbitrary filesystem images can trigger a kernel oops and service interruption; network input alone does not reach the flaw.

CVSS severity7.0
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel NILFS2 implementation allows local users to crash the system by mounting a corrupted filesystem image. nilfs_new_inode() can allocate a reserved root inode from an inconsistent bitmap, after which nilfs_clear_inode() wrongly decrements and frees the nilfs_root object. A user permitted to mount arbitrary filesystem images can trigger a kernel oops and service interruption; network input alone does not reach the flaw.

The record

CVE
CVE-2022-3649
Published
Oct 21, 2022
Updated
Aug 3, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, CWE-119, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=n/a

Published CVSS scores

3.1VulDBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
7.0NIST NVDCVSS:3.1/AV:L/AC:H/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
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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