CVE-2022-49904

Kernel panic via IPv6 cleanup null dereference

Published May 1, 2025 · Updated May 23, 2026

NULL pointer dereference in affected Linux kernel releases allows local users to crash the system during failed IPv6 initialization. neigh_ifdown passes a null device into dev_net while neigh_table_clear purges the proxy queue, dereferencing the null pointer. Exploitation requires local low-privilege access and a failing IPv6 module initialization path; the bounded impact is a kernel panic.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernel releases allows local users to crash the system during failed IPv6 initialization. neigh_ifdown passes a null device into dev_net while neigh_table_clear purges the proxy queue, dereferencing the null pointer. Exploitation requires local low-privilege access and a failing IPv6 module initialization path; the bounded impact is a kernel panic.

The record

CVE
CVE-2022-49904
Published
May 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=05fdce1ae744dee43c9181fd063c9c0db4f777f2 <b736592de2aa53aee2d48d6b129bc0c892007bbe
  2. Affected versionversion=2dd5ed474115150d8175825bc3b56c6385c3a83b
  3. Affected versionversion=4.14.292 <4.14.299
  4. Affected versionversion=4.19.257 <4.19.265
  5. Affected versionversion=5.10.141 <5.10.154
  6. Affected versionversion=5.15.65 <5.15.78
  7. Affected versionversion=5.19.7 <5.20
  8. Affected versionversion=51be9dd391fd25872b95708a0250f2f7722d2d8e <b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c
  9. Affected versionversion=5.4.212 <5.4.224
  10. Affected versionversion=6.0
  11. Affected versionversion=66ba215cb51323e4e55e38fd5f250e0fae0cbc94 <a99a8ec4c62180c889482a2ff6465033e0743458
  12. Affected versionversion=66ba215cb51323e4e55e38fd5f250e0fae0cbc94 <f8017317cb0b279b8ab98b0f3901a2e0ac880dad
  13. Affected versionversion=9bbaed571c4bf1b62ac8703cb359dc090efc3455 <0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0
  14. Affected versionversion=c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8 <1c89642e7f2b7ecc9635610653f5c2f0276c0051
  15. Affected versionversion=db6fa03d80ab076238fc806c9925d1f8b9639d1b <2b45d6d0c41cb9593868e476681efb1aae5078a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=05fdce1ae744dee43c9181fd063c9c0db4f777f2 <b736592de2aa53aee2d48d6b129bc0c892007bbe; version=2dd5ed474115150d8175825bc3b56c6385c3a83b; version=4.14.292 <4.14.299; version=4.19.257 <4.19.265; version=5.10.141 <5.10.154; version=5.15.65 <5.15.78; version=5.19.7 <5.20; version=51be9dd391fd25872b95708a0250f2f7722d2d8e <b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c; version=5.4.212 <5.4.224; version=6.0; version=66ba215cb51323e4e55e38fd5f250e0fae0cbc94 <a99a8ec4c62180c889482a2ff6465033e0743458; version=66ba215cb51323e4e55e38fd5f250e0fae0cbc94 <f8017317cb0b279b8ab98b0f3901a2e0ac880dad; version=9bbaed571c4bf1b62ac8703cb359dc090efc3455 <0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0; version=c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8 <1c89642e7f2b7ecc9635610653f5c2f0276c0051; version=db6fa03d80ab076238fc806c9925d1f8b9639d1b <2b45d6d0c41cb9593868e476681efb1aae5078a1

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-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 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

CWE-476NULL Pointer Dereference
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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