CVE-2022-49691

Kernel warning via unset transport header access

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in Linux kernel ERSPAN transmit handling allows local users to trigger a kernel warning through crafted IPv6 traffic. The erspan_fb_xmit and ip6erspan_tunnel_xmit paths read skb_transport_header without first confirming that the transport header was set. Low-privileged local access is required; published scoring limits the impact to availability, with no reported data access or modification.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Denial of service in Linux kernel ERSPAN transmit handling allows local users to trigger a kernel warning through crafted IPv6 traffic. The erspan_fb_xmit and ip6erspan_tunnel_xmit paths read skb_transport_header without first confirming that the transport header was set. Low-privileged local access is required; published scoring limits the impact to availability, with no reported data access or modification.

The record

CVE
CVE-2022-49691
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.18
  2. Affected versionversion=d5db21a3e6977dcb42cee3d16cd69901fa66510a <02da602bc2f353dccd9e489a604490034ded941e
  3. Affected versionversion=d5db21a3e6977dcb42cee3d16cd69901fa66510a <2c8aeffc7c586d53e1d380f010bdca4f710f2480
  4. Affected versionversion=d5db21a3e6977dcb42cee3d16cd69901fa66510a <301bd140ed0b24f0da660874c7e8a47dad8c8222
  5. Affected versionversion=d5db21a3e6977dcb42cee3d16cd69901fa66510a <a3b2470399f679587c45abe56e551caf10becca2
  6. Affected versionversion=d5db21a3e6977dcb42cee3d16cd69901fa66510a <cec9867ee55478ef5dcb2adf030fe0c442a4c4ee
  7. Affected versionversion=d5db21a3e6977dcb42cee3d16cd69901fa66510a <fb401f37f6eadf24956d93687e5758c163c0d12b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=d5db21a3e6977dcb42cee3d16cd69901fa66510a <02da602bc2f353dccd9e489a604490034ded941e; version=d5db21a3e6977dcb42cee3d16cd69901fa66510a <2c8aeffc7c586d53e1d380f010bdca4f710f2480; version=d5db21a3e6977dcb42cee3d16cd69901fa66510a <301bd140ed0b24f0da660874c7e8a47dad8c8222; version=d5db21a3e6977dcb42cee3d16cd69901fa66510a <a3b2470399f679587c45abe56e551caf10becca2; version=d5db21a3e6977dcb42cee3d16cd69901fa66510a <cec9867ee55478ef5dcb2adf030fe0c442a4c4ee; version=d5db21a3e6977dcb42cee3d16cd69901fa66510a <fb401f37f6eadf24956d93687e5758c163c0d12b

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical Ubuntu SecurityCVSS: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.

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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