Local denial of service in Linux kernel nft

1) NULL pointer dereference

EUVDB-ID: #VU86244

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5972

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the nft_inner_init() and nft_expr_inner_parse() functions in nft_inner.c. A local user can set specially crafted values for the NFTA_INNER_NUM and NFTA_EXPR_NAM netlink attributes and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://access.redhat.com/security/cve/CVE-2023-5972
http://bugzilla.redhat.com/show_bug.cgi?id=2248189
http://github.com/torvalds/linux/commit/505ce0630ad5d31185695f8a29dde8d29f28faa7
http://github.com/torvalds/linux/commit/52177bbf19e6e9398375a148d2e13ed492b40b80

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.