CVE-2022-49418Network attack vector

Kernel panic via uninitialized NFSv4 label free

Published Feb 26, 2025 · Updated Aug 5, 2026

Memory corruption in the Linux kernel NFSv4 client 5.16 through 5.18.2 allows remote attackers to crash clients via referrals. nfs4_get_referral copies an nfs_fattr containing pointer fields, replacing a valid label pointer with uninitialized allocation data that nfs4_label_free later frees. An existing NFSv4 mount to a malicious or compromised server and a referral-triggering lookup are required; the reported consequence is a kernel panic.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel NFSv4 client 5.16 through 5.18.2 allows remote attackers to crash clients via referrals. nfs4_get_referral copies an nfs_fattr containing pointer fields, replacing a valid label pointer with uninitialized allocation data that nfs4_label_free later frees. An existing NFSv4 mount to a malicious or compromised server and a referral-triggering lookup are required; the reported consequence is a kernel panic.

The record

CVE
CVE-2022-49418
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499.004
Attack vector
network
Privileges
unauthenticated

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=5.16
  2. Affected versionversion=9558a007dbc383d48e7f5a123d0b5ff656c71068 <6015292653d95ba9f72906e2b65e536aa5807d64
  3. Affected versionversion=9558a007dbc383d48e7f5a123d0b5ff656c71068 <c3ed222745d9ad7b69299b349a64ba533c64a34f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=9558a007dbc383d48e7f5a123d0b5ff656c71068 <6015292653d95ba9f72906e2b65e536aa5807d64; version=9558a007dbc383d48e7f5a123d0b5ff656c71068 <c3ed222745d9ad7b69299b349a64ba533c64a34f

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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