CVE-2022-49378

Network interface outage via misclassified transmit queues

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in the Linux sfc driver allows local users to interrupt an affected network interface via separated TX channels. The efx_channel_has_tx_queues helper treats allocated but uninitialized transmit queues as usable when transmit channels are separated, causing initialization of queue -1 to fail. Exploitation requires the efx_separate_tx_channels=1 module setting and compatible sfc hardware; the documented consequence is failure to initialize or flush interface queues.

CVSS severity5.5
Medium
EPSS probability0.26%
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 the Linux sfc driver allows local users to interrupt an affected network interface via separated TX channels. The efx_channel_has_tx_queues helper treats allocated but uninitialized transmit queues as usable when transmit channels are separated, causing initialization of queue -1 to fail. Exploitation requires the efx_separate_tx_channels=1 module setting and compatible sfc hardware; the documented consequence is failure to initialize or flush interface queues.

The record

CVE
CVE-2022-49378
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=5.5
  2. Affected versionversion=8700aff089843399f95bc7701ae87b642b35a716 <2e102b53f8a778f872dc137f4c7ac548705817aa
  3. Affected versionversion=8700aff089843399f95bc7701ae87b642b35a716 <5567d69b95b9c07e1c56f15cf0301251d12e5f97
  4. Affected versionversion=8700aff089843399f95bc7701ae87b642b35a716 <8f81a4113e1e574d2cbde4f2cd599380a9189c0f
  5. Affected versionversion=8700aff089843399f95bc7701ae87b642b35a716 <913d45f02d346ce41c4aad057eaf53a8ed449dc3
  6. Affected versionversion=8700aff089843399f95bc7701ae87b642b35a716 <e7e8d5e25dc762b70f9c88ec6b7d451d0816eead

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=8700aff089843399f95bc7701ae87b642b35a716 <2e102b53f8a778f872dc137f4c7ac548705817aa; version=8700aff089843399f95bc7701ae87b642b35a716 <5567d69b95b9c07e1c56f15cf0301251d12e5f97; version=8700aff089843399f95bc7701ae87b642b35a716 <8f81a4113e1e574d2cbde4f2cd599380a9189c0f; version=8700aff089843399f95bc7701ae87b642b35a716 <913d45f02d346ce41c4aad057eaf53a8ed449dc3; version=8700aff089843399f95bc7701ae87b642b35a716 <e7e8d5e25dc762b70f9c88ec6b7d451d0816eead

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 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

No sourced classifications are available.

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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