CVE-2022-49654

Network outage via live CPU-port MTU change

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in affected Linux kernels allows local users to interrupt networking by changing the MTU on a QCA8K switch. qca8k_port_change_mtu changes MAX_FRAME_SIZE while CPU ports remain enabled, causing the switch to panic and stop forwarding packets. Local privileges to change interface MTU and QCA8K DSA hardware are required, and connectivity remains unavailable until the switch is reset.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux kernels allows local users to interrupt networking by changing the MTU on a QCA8K switch. qca8k_port_change_mtu changes MAX_FRAME_SIZE while CPU ports remain enabled, causing the switch to panic and stop forwarding packets. Local privileges to change interface MTU and QCA8K DSA hardware are required, and connectivity remains unavailable until the switch is reset.

The record

CVE
CVE-2022-49654
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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=5.9
  2. Affected versionversion=f58d2598cf70d41f73e761b62a114d2e8f94a676 <188c798f3c2554fa0d7147e9b97baf144b817019
  3. Affected versionversion=f58d2598cf70d41f73e761b62a114d2e8f94a676 <1993f5a06736ada59dd54b50dc96755a38796ee5
  4. Affected versionversion=f58d2598cf70d41f73e761b62a114d2e8f94a676 <386228c694bf1e7a7688e44412cb33500b0ac585

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=f58d2598cf70d41f73e761b62a114d2e8f94a676 <188c798f3c2554fa0d7147e9b97baf144b817019; version=f58d2598cf70d41f73e761b62a114d2e8f94a676 <1993f5a06736ada59dd54b50dc96755a38796ee5; version=f58d2598cf70d41f73e761b62a114d2e8f94a676 <386228c694bf1e7a7688e44412cb33500b0ac585

Published CVSS scores

5.5NIST NVDCVSS: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.

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Technologies

Your stack

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Your stack

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