Linux Kernel up to 5.18.9 User Namespace nf_tables_api.c nft_set_elem_init type confusion

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.18.9. The impacted element is the function nft_set_elem_init of the file net/netfilter/nf_tables_api.c of the component User Namespace Handler. Such manipulation leads to type confusion. This vulnerability is referenced as CVE-2022-34918. It is possible to launch the attack remotely. Furthermore, an exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.18.9 (Operating System). It has been rated as critical. Affected by this issue is the function nft_set_elem_init of the file net/netfilter/nf_tables_api.c of the component User Namespace Handler. The manipulation with an unknown input leads to a type confusion vulnerability. Using CWE to declare the problem leads to CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in nft_set_elem_init (leading to a buffer overflow) could be used by a local attacker to escalate privileges, a different vulnerability than CVE-2022-32250. (The attacker can obtain root access, but must start with an unprivileged user namespace to obtain CAP_NET_ADMIN access.) This can be fixed in nft_setelem_parse_data in net/netfilter/nf_tables_api.c.

The weakness was published 07/05/2022. The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2022-34918 since 07/04/2022. Technical details as well as a public exploit are known.

The exploit is available at packetstormsecurity.com. It is declared as highly functional. As 0-day the estimated underground price was around $5k-$25k.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7
• 5.18.8
• 5.18.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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