K000139430 : Linux kernel vulnerability CVE-2024-1086

Security Advisory Description

A use-after-free vulnerability in the Linux kernel’s netfilter: nf_tables component can be exploited to achieve local privilege escalation. The nft_verdict_init() function allows positive values as drop error within the hook verdict, and hence the nf_hook_slow() function can cause a double free vulnerability when NF_DROP is issued with a drop error which resembles NF_ACCEPT. We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660. (CVE-2024-1086)

Impact

When user namespaces are enabled and your system is using the Netfilter, a local attacker with user access may be able to exploit this flaw leading to privilege escalation.