CVE-2023-52924: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-52924 is a vulnerability in the Linux kernel's netfilter component, specifically in the nf_tables functionality. The vulnerability was disclosed on February 5, 2025, affecting the netfilter's handling of expired elements during walk operations. The issue occurs in the Linux kernel when specific conditions are met involving verdict maps with timeouts enabled (NVD).

The vulnerability stems from an asymmetry between commit/abort and preparation phases in the netfilter component. The issue manifests when two specific conditions are met: the set is a verdict map ("1.2.3.4 : jump foo") and timeouts are enabled. The problematic sequence involves an element E in set S referring to chain C, where userspace requests removal of set S. This leads to kernel operations that can result in a chain use count leak and potential WARN splat when the chain is removed later (Red Hat).

The vulnerability can result in a memory leak of the nft_chain structure and generate WARN splat messages when the affected chain is removed. This primarily affects system stability and resource management (NVD).

The issue has been resolved through a patch that updates the pipapo_get() function to not skip expired elements during walk operations. The fix prevents bogus ENOENT errors from flush commands and addresses the chain use count leak issue (Kernel Commit).