CVE-2023-53343Public exploit

Kernel crash via unchecked IPv6 route device pointer

Published Sep 17, 2025 · Updated Sep 17, 2025

A NULL pointer dereference in the Linux kernel allows local users to crash the system via a crafted IPv6 extension-header packet. When extension-header route lookup fails, icmp6_dev() reads rt6i_idev->dev from ip6_null_entry without first checking whether rt6i_idev is NULL. The demonstrated trigger requires local raw IPv6 packet injection and enabled segment routing; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux kernel allows local users to crash the system via a crafted IPv6 extension-header packet. When extension-header route lookup fails, icmp6_dev() reads rt6i_idev->dev from ip6_null_entry without first checking whether rt6i_idev is NULL. The demonstrated trigger requires local raw IPv6 packet injection and enabled segment routing; the bounded consequence is a kernel crash.

The record

CVE
CVE-2023-53343
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2025Record 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=4.14
  2. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <1462e9d9aa52d14665eaca6d89d22c4af44ede04
  3. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <2aaa8a15de73874847d62eb595c6683bface80fd
  4. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <3fabca5d9cae0140b6aad09a1c6b9aa57089fbb8
  5. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <61b4c4659746959056450b92a5d7e6bc1243b31b
  6. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <8803c59fde4dd370a627dfbf7183682fa0cabf70
  7. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <aa657d319e6c7502a4eb85cc0ee80cc81b8e5724
  8. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <d30ddd7ff15df9d91a793ce3f06f0190ff7afacc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <1462e9d9aa52d14665eaca6d89d22c4af44ede04; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <2aaa8a15de73874847d62eb595c6683bface80fd; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <3fabca5d9cae0140b6aad09a1c6b9aa57089fbb8; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <61b4c4659746959056450b92a5d7e6bc1243b31b; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <8803c59fde4dd370a627dfbf7183682fa0cabf70; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <aa657d319e6c7502a4eb85cc0ee80cc81b8e5724; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <d30ddd7ff15df9d91a793ce3f06f0190ff7afacc

Published CVSS scores

5.5CISA ADP VulnrichmentCVSS: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

CWE-476NULL Pointer Dereference

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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