{"id":49333,"date":"2025-06-06T15:38:28","date_gmt":"2025-06-06T15:38:28","guid":{"rendered":""},"modified":"2025-08-31T18:38:10","modified_gmt":"2025-09-01T00:38:10","slug":"cve-2025-22035-linux-kernel-uaf-vulnerability-in-print-graph-function-flags","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-22035-linux-kernel-uaf-vulnerability-in-print-graph-function-flags\/","title":{"rendered":"CVE-2025-22035: Linux Kernel UAF Vulnerability in print_graph_function_flags<\/strong>"},"content":{"rendered":"

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

Critical vulnerabilities in widely deployed software like the Linux kernel can have far-reaching consequences, affecting numerous systems and devices globally. CVE-2025-22035 is one such vulnerability. It affects the tracing functionality in the Linux kernel<\/a>, a key component that enables developers to troubleshoot system issues and application performance. The vulnerability could potentially allow an attacker to compromise systems<\/a> and leak data, making it a serious threat that needs immediate attention.
\nThe vulnerability has been rated as high severity<\/a> (CVSS score of 7.8), signifying that its exploitation could have significant consequences. This blog post aims to provide a detailed breakdown of CVE-2025-22035, including its effects, how it can be exploited, and how to mitigate it.<\/p>\n

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

CVE ID: CVE-2025-22035
\nSeverity: High, CVSS score: 7.8
\nAttack Vector: Local
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: Potential system compromise and data leakage<\/a><\/p>\n

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

Product | Affected Versions<\/p>\n

Linux Kernel<\/a> | [Insert affected version]<\/p>\n

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

The vulnerability arises from a use-after-free<\/a> (UAF) issue in the print_graph_function_flags() function within the Linux kernel’s tracing component. During ftrace stress testing, tracer switching only updates one of the two calls to print_graph_function_flags, leaving the second to use the print_line function of the old tracer.
\nWhen switching tracers, ‘iter->private’ is freed but not set to NULL, providing an opportunity for an invalid ‘iter->private’ to be used. This can lead to undefined behavior and potentially be exploited to execute arbitrary code<\/a> or cause a denial of service.<\/p>\n

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

Below is a conceptual example of how the vulnerability might be exploited<\/a>. This is not actual exploit code, but a representation of the steps an attacker might take.<\/p>\n

# Switch to the function_graph tracer\necho function_graph > current_tracer\n# Start a background process that reads the trace\ncat trace > \/dev\/null &\n# Ensure the 'cat' reaches the 'mdelay(10)' point\nsleep 5\n# Switch to the 'timerlat' tracer, triggering the vulnerability\necho timerlat > current_tracer<\/code><\/pre>\n
Mitigation Guidance<\/strong><\/p>\n
The most effective mitigation for this vulnerability is to apply the patch provided<\/a> by the vendor. Users and administrators should update their Linux kernels<\/a> to the latest patched version as soon as possible.
\nIn the meantime, or in situations where immediate patching is not feasible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These can help detect and block attempts to exploit the vulnerability<\/a>.
\nUnderstanding and addressing cybersecurity vulnerabilities<\/a> like CVE-2025-22035 is crucial for maintaining the security and integrity of systems and data. Stay informed and proactive in your cybersecurity practices to protect your systems against potential<\/a> threats.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview Critical vulnerabilities in widely deployed software like the Linux kernel can have far-reaching consequences, affecting numerous systems and devices globally. CVE-2025-22035 is one such vulnerability. It affects the tracing functionality in the Linux kernel, a key component that enables developers to troubleshoot system issues and application performance. The vulnerability could potentially allow an attacker […]<\/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":[87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-49333","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","product-linux-kernel","attack_vector-dos"],"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