CVE-2022-49662Public exploit

Kernel crash via unsafe IPv6 RCU dereference

Published Feb 26, 2025 · Updated Jul 24, 2026

Concurrency flaw in Linux kernel 5.13 through 5.18.9 allows local users to crash the kernel through an IPv6 address dump. The in6_dump_addrs function reads an IPv6 device pointer with rcu_dereference without holding the required RCU read lock, despite holding RTNL. A low-privileged local process can reach the netlink address-dump path; the reported effects are a lockdep warning and availability failure, not data disclosure or modification.

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

Concurrency flaw in Linux kernel 5.13 through 5.18.9 allows local users to crash the kernel through an IPv6 address dump. The in6_dump_addrs function reads an IPv6 device pointer with rcu_dereference without holding the required RCU read lock, despite holding RTNL. A low-privileged local process can reach the netlink address-dump path; the reported effects are a lockdep warning and availability failure, not data disclosure or modification.

The record

CVE
CVE-2022-49662
Published
Feb 26, 2025
Updated
Jul 24, 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. Jul 24, 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=5.13
  2. Affected versionversion=676457fe5ad19517a8b21d1c3f4d23512118f6a3 <ea18594da69a09f68491da57f9fa09f003efbbc7
  3. Affected versionversion=88e2ca3080947fe22eb520c1f8231e79a105d011 <2930ee1a166df0e12fe9fec4b79cc3dc9634ae45
  4. Affected versionversion=88e2ca3080947fe22eb520c1f8231e79a105d011 <4e43e64d0f1332fcc503babad4dc31aead7131ca
  5. Affected versionversion=88e2ca3080947fe22eb520c1f8231e79a105d011 <b39fda51c32dd879451e0119881f31493bf83283

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=676457fe5ad19517a8b21d1c3f4d23512118f6a3 <ea18594da69a09f68491da57f9fa09f003efbbc7; version=88e2ca3080947fe22eb520c1f8231e79a105d011 <2930ee1a166df0e12fe9fec4b79cc3dc9634ae45; version=88e2ca3080947fe22eb520c1f8231e79a105d011 <4e43e64d0f1332fcc503babad4dc31aead7131ca; version=88e2ca3080947fe22eb520c1f8231e79a105d011 <b39fda51c32dd879451e0119881f31493bf83283

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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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