CVE-2022-49280Network attack vector

Kernel compromise via oversized NFSv2 WRITE length

Published Feb 26, 2025 · Updated Aug 5, 2026

Integer underflow in the NFSD NFSv2 WRITE decoder in the Linux kernel allows remote attackers to corrupt kernel memory. nfssvc_decode_writeargs treats the attacker-controlled opaque length as signed, so oversized values bypass the maximum-size check and wrap during alignment before becoming ULONG_MAX downstream. A reachable NFSD service with NFSv2 enabled is sufficient; crafted WRITE RPCs can disclose or overwrite kernel memory and panic the host without prior authentication or user interaction.

CVSS severity5.5
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the NFSD NFSv2 WRITE decoder in the Linux kernel allows remote attackers to corrupt kernel memory. nfssvc_decode_writeargs treats the attacker-controlled opaque length as signed, so oversized values bypass the maximum-size check and wrap during alignment before becoming ULONG_MAX downstream. A reachable NFSD service with NFSv2 enabled is sufficient; crafted WRITE RPCs can disclose or overwrite kernel memory and panic the host without prior authentication or user interaction.

The record

CVE
CVE-2022-49280
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, 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=5.12
  2. Affected versionversion=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <184416d4b98509fb4c3d8fc3d6dc1437896cc159
  3. Affected versionversion=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <2764af8ce0bf03cc43ee4a11897cab96bde6caae
  4. Affected versionversion=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <413d8fefafe531a9442bb623e3fe292a38f88d65
  5. Affected versionversion=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <614a61e1592051cc42d3c38f899c9f7bdaad8a1d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <184416d4b98509fb4c3d8fc3d6dc1437896cc159; version=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <2764af8ce0bf03cc43ee4a11897cab96bde6caae; version=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <413d8fefafe531a9442bb623e3fe292a38f88d65; version=a51b5b737a0be93fae6ea2a18df03ab2359a3f4b <614a61e1592051cc42d3c38f899c9f7bdaad8a1d

Published CVSS scores

5.5CISA-ADPCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Application or System Exploitation

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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