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The KernelCare team is working on deploying a live patch for CVE-2024-1086 for CloudLinux users. A patch has already been released for CloudLinux 7h and CloudLinux 8, and users can manually update without a live patch. Instructions for doing so can be found here.
More details on the status of the live patch availability below.
About the CVE
This vulnerability was identified in the Netfilter subsystem of the Linux kernel. This flaw can be found in the nft_verdict_init() function, which enables positive values to be interpreted as drop errors in the hook verdict. As a consequence, the nf_hook_slow() function can trigger a double-free vulnerability when NF_DROP is issued with a drop error similar to NF_ACCEPT. Exploiting this issue in the nf_tables component could lead to local privilege escalation.
TuxCare strongly suggests patching as soon as possible, as this vulnerability has publicly available proof-of-concept code that makes it trivially exploitable for a local user on a vulnerable system.
Live Patch Status
Live patches have moved through the Quality Assurance phase and are now available for deployment in the main feed for CloudLinux 7h and 8.
Note: As this vulnerability affects multiple versions across different distributions, you can follow the status of the release in the TuxCare CVE tracker here.
Check this blog post again for an update.
