{"id":49450,"date":"2025-06-07T01:43:25","date_gmt":"2025-06-07T01:43:25","guid":{"rendered":""},"modified":"2025-08-30T00:12:40","modified_gmt":"2025-08-30T06:12:40","slug":"cve-2025-22085-linux-kernel-use-after-free-vulnerability-in-rdma-core","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-22085-linux-kernel-use-after-free-vulnerability-in-rdma-core\/","title":{"rendered":"CVE-2025-22085: Linux Kernel Use-After-Free Vulnerability in RDMA\/Core<\/strong>"},"content":{"rendered":"

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

This blog post dissects a significant security vulnerability identified in the Linux kernel, specifically impacting the RDMA\/Core subsystem. CVE-2025-22085, as it is officially known, has the potential to inflict serious damage on affected systems, leading to potential system compromise or data leakage. This vulnerability matters greatly due to the widespread use of Linux in servers, embedded systems, and many other areas, meaning a large number of devices and systems could potentially<\/a> be at risk.<\/p>\n

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

CVE ID: CVE-2025-22085
\nSeverity: High (7.8 CVSS Severity Score)
\nAttack Vector: Network
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: Potential system compromise or data leakage<\/a><\/p>\n

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

Product | Affected Versions<\/p>\n

Linux Kernel<\/a> | 6.14.0-rc4 and earlier versions<\/p>\n

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

The vulnerability resides in the RDMA\/Core subsystem of the Linux kernel<\/a>. It is a use-after-free vulnerability<\/a> that occurs when renaming the device name. A use-after-free error can occur when a pointer to a resource is used after it has been freed, leading to various adverse effects such as system crashes, data corruption, and, in some cases, arbitrary code execution<\/a>.
\nThe issue was first reported by Syzbot, a software testing toolset developed by Google. It identified a slab-use-after-free condition in the nla_put function in the lib\/nlattr.c file of the Linux kernel<\/a>, which was triggered by a specific sequence of system calls.<\/p>\n

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

While the specific exploit code for this vulnerability<\/a> is not publicly available, the nature of use-after-free vulnerabilities means the exploit could conceptually involve reusing a pointer to a network device after it has been freed. This could be executed by an attacker sending a carefully crafted packet sequence to the vulnerable device, triggering the use-after-free condition and potentially leading to arbitrary code execution<\/a>.<\/p>\n

\/\/ Conceptual pseudocode for triggering use-after-free condition\nstruct net_device *dev = alloc_netdev();\n\/\/ The device is registered, allocated memory\nregister_netdev(dev);\n\/\/ The device is unregistered, memory is freed\nunregister_netdev(dev);\n\/\/ The device is used after being freed, triggering the use-after-free\nnetdev_ops->ndo_start_xmit(dev);<\/code><\/pre>\n
Mitigation and Recommendations<\/strong><\/p>\n
The most direct mitigation is to apply the patch provided by the vendor, which resolves the use-after-free condition by ensuring that the device’s memory<\/a> is not accessed after being freed. If patching is not immediately possible, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) configured to detect and block malicious traffic that attempts to exploit this vulnerability<\/a> can serve as a temporary measure.
\nIt is always recommended to follow best practice security measures such as keeping systems and software<\/a> up-to-date, limiting the attack surface by disabling or uninstalling unnecessary services, and monitoring systems for unusual activity.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview This blog post dissects a significant security vulnerability identified in the Linux kernel, specifically impacting the RDMA\/Core subsystem. CVE-2025-22085, as it is officially known, has the potential to inflict serious damage on affected systems, leading to potential system compromise or data leakage. This vulnerability matters greatly due to the widespread use of Linux in […]<\/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":[91,88],"product":[95],"attack_vector":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-49450","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-google","vendor-linux","product-linux-kernel","attack_vector-rce"],"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