Linux Kernel up to 6.6.34/6.9.5 Netlink Attribute null pointer dereference

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.34/6.9.5. It has been rated as critical. Affected by this issue is some unknown functionality of the component Netlink Attribute Handler. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2024-39504. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.6.34/6.9.5 and classified as critical. Affected by this vulnerability is an unknown function of the component Netlink Attribute Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: validate mandatory meta and payload Check for mandatory netlink attributes in payload and meta expression when used embedded from the inner expression, otherwise NULL pointer dereference is possible from userspace.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2024-39504 since 06/25/2024. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 209903 (RHEL 9 : kernel (RHSA-2024:8617)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.35 or 6.9.6 eliminates this vulnerability. Applying the patch b30669fdea0c/39323f54cad2/c4ab9da85b9d is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (209903). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.6.33
• 6.6.34
• 6.9.0
• 6.9.1
• 6.9.2
• 6.9.3
• 6.9.4
• 6.9.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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