CVE-2022-49663

Local service interruption via unset MAC header

Published Feb 26, 2025 · Updated May 11, 2026

Improper header handling in Linux allows local users to interrupt service by transmitting crafted packets through a Geneve tunnel. skb_tunnel_check_pmtu() reads skb->mac_header even though ndo_start_xmit() leaves that offset unset and positions skb->data at the MAC header. The path requires local low-privileged packet transmission; it raises a kernel warning and crashes systems configured to panic on warnings.

CVSS severity5.5
Medium
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 header handling in Linux allows local users to interrupt service by transmitting crafted packets through a Geneve tunnel. skb_tunnel_check_pmtu() reads skb->mac_header even though ndo_start_xmit() leaves that offset unset and positions skb->data at the MAC header. The path requires local low-privileged packet transmission; it raises a kernel warning and crashes systems configured to panic on warnings.

The record

CVE
CVE-2022-49663
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE 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

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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=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <32dcf62efa0003f92a976aea0c57f118e689de8b
  2. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <59c51c3b545128a92ebfb6dbae990d3abee110e7
  3. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <674a641e5b67e16ba3112eacd680ff87b38539de
  4. Affected versionversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <853a7614880231747040cada91d2b8d2e995c51a
  5. Affected versionversion=5.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <32dcf62efa0003f92a976aea0c57f118e689de8b; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <59c51c3b545128a92ebfb6dbae990d3abee110e7; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <674a641e5b67e16ba3112eacd680ff87b38539de; version=4cb47a8644cc9eb8ec81190a50e79e6530d0297f <853a7614880231747040cada91d2b8d2e995c51a; version=5.9

Published CVSS scores

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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