Linux Kernel up to 6.1.10 net/netrom/af_netrom.c nr_listen sock use after free

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.1.10 and classified as problematic. Affected by this issue is the function nr_listen of the file net/netrom/af_netrom.c. The manipulation of the argument sock leads to use after free. This vulnerability is traded as CVE-2023-32269. An attack has to be approached locally. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.10 (Operating System) and classified as problematic. This issue affects the function nr_listen of the file net/netrom/af_netrom.c. The manipulation of the argument sock with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. The impact remains unknown. The summary by CVE is:

An issue was discovered in the Linux kernel before 6.1.11. In net/netrom/af_netrom.c, there is a use-after-free because accept is also allowed for a successfully connected AF_NETROM socket. However, in order for an attacker to exploit this, the system must have netrom routing configured or the attacker must have the CAP_NET_ADMIN capability.

The weakness was shared 05/05/2023 as 611792920925fb088ddccbe2783c7f92fdfb6b64. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2023-32269 since 05/05/2023. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 276356 (TencentOS Server 3: kernel (TSSA-2023:0340)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.11 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying the patch 611792920925fb088ddccbe2783c7f92fdfb6b64 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (276356) and EUVD (EUVD-2023-36523). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

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