{"id":34381,"date":"2025-05-04T10:00:14","date_gmt":"2025-05-04T10:00:14","guid":{"rendered":""},"modified":"2025-08-30T00:12:40","modified_gmt":"2025-08-30T06:12:40","slug":"cve-2024-0193-linux-kernel-use-after-free-vulnerability-in-netfilter-subsystem","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2024-0193-linux-kernel-use-after-free-vulnerability-in-netfilter-subsystem\/","title":{"rendered":"CVE-2024-0193: Linux Kernel Use-After-Free Vulnerability in Netfilter Subsystem<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The Linux kernel, the core component of the Linux operating system, is the target of a serious vulnerability labelled as CVE-2024-0193. This vulnerability resides within the kernel\u2019s netfilter subsystem, a framework that provides the tools necessary for the manipulation of network packets. It is a use-after-free flaw, which can allow an attacker to execute arbitrary code, potentially leading to system<\/a> compromise or data leakage. This vulnerability is of particular concern as it can be exploited by a local unprivileged user with CAP_NET_ADMIN capability, thereby providing a straightforward path to escalating their privileges<\/a> on the system.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2024-0193
\nSeverity: High (7.8 CVSS)
\nAttack Vector: Local
\nPrivileges Required: Low (CAP_NET_ADMIN)
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise, data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Linux Kernel | Versions prior<\/a> to patch release<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability at its core<\/a> is a use-after-free flaw. A use-after-free error occurs when a piece of memory<\/a> is freed (deleted) while there are still pointers to it that haven’t been updated. In this case, the netfilter subsystem of the Linux kernel<\/a> is affected. Specifically, if the catchall element is garbage-collected when the pipapo set is removed, the element can be deactivated twice. This can cause a use-after-free issue on an NFT_CHAIN object or NFT_OBJECT object, allowing a local unprivileged user with CAP_NET_ADMIN capability to escalate their privileges on the system<\/a>.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual representation of how the vulnerability might be exploited<\/a>:<\/p>\n

# Gain CAP_NET_ADMIN capability\nsudo setcap cap_net_admin+ep \/bin\/bash\n# Run command to interact with netfilter and trigger the use-after-free flaw\necho \"remove pipapo set\" | nft -f -<\/code><\/pre>\n
This pseudo-code demonstrates the potential exploitation of the vulnerability by an unprivileged user gaining the CAP_NET_ADMIN capability and then running a command to interact with the netfilter<\/a> subsystem in a way that triggers the use-after-free flaw. This could potentially allow the user to escalate their privileges and execute arbitrary code<\/a>.
\nTo mitigate this vulnerability, it is recommended to immediately apply any available vendor patches. In the absence of a patch, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used as a temporary mitigation measure. However, these should not be seen as a long-term solution, but rather a stopgap until patches can be applied.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The Linux kernel, the core component of the Linux operating system, is the target of a serious vulnerability labelled as CVE-2024-0193. This vulnerability resides within the kernel\u2019s netfilter subsystem, a framework that provides the tools necessary for the manipulation of network packets. It is a use-after-free flaw, which can allow an attacker to execute […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[88],"product":[95],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-34381","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","product-linux-kernel"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t