high
7.5
CWE
400
Advisory Published
CVE Published
Updated

CVE-2023-52340

First published: Thu Jan 11 2024(Updated: )

A flaw in the Linux Kernel found. When a router encounters an IPv6 packet too big to transmit to the next-hop, it returns an ICMP6 "Packet Too Big" (PTB) message to the sender. The sender caches this updated Maximum Transmission Unit (MTU) so it knows not to exceed this value when subsequently routing to the same host. In Linux kernels prior to 6.3, garbage collection is run on the IPv6 Destination Route Cache if the number of entries exceeds a threshold when adding the destination to the cache. This garbage collection examines every entry in the cache while holding a lock. In these affected kernel versions, a flood of the IPv6 ICMP6 PTB messages could cause high lock contention and increased CPU usage, leading to a Denial-of-Service. The fix backports the garbage collection improvements from Linux kernel 6.3 by bringing the IPv6 code closer to the IPv4 code, which does not have this issue. References: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=af6d10345ca76670c1b7c37799f0d5576ccef277">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=af6d10345ca76670c1b7c37799f0d5576ccef277</a> <a href="https://alas.aws.amazon.com/cve/html/CVE-2023-52340.html">https://alas.aws.amazon.com/cve/html/CVE-2023-52340.html</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.3
6.3
<6.3
Linux Kernel<6.3
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager Software Stack<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager Virtual Appliance<=ISVG 10.0.2
IBM Security Verify Governance Identity Manager Container<=ISVG 10.0.2
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.133-1
6.12.21-1
6.12.22-1

Remedy

https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=af6d10345ca76670c1b7c37799f0d5576ccef277

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-52340?

    CVE-2023-52340 is classified as a medium severity vulnerability in the Linux Kernel.

  • How do I fix CVE-2023-52340?

    To fix CVE-2023-52340, update your Linux Kernel to version 6.3 or later.

  • Which versions of the Linux Kernel are affected by CVE-2023-52340?

    CVE-2023-52340 affects all versions of the Linux Kernel up to 6.3.

  • Is CVE-2023-52340 specific to any Linux distributions?

    CVE-2023-52340 impacts various Linux distributions including Red Hat and Debian.

  • Are there any known exploits for CVE-2023-52340?

    As of now, there are no known public exploits for CVE-2023-52340.

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