{"id":79348,"date":"2025-09-29T08:50:05","date_gmt":"2025-09-29T08:50:05","guid":{"rendered":""},"modified":"2025-10-07T04:32:28","modified_gmt":"2025-10-07T10:32:28","slug":"cve-2025-49761-critical-use-after-free-vulnerability-in-windows-kernel","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49761-critical-use-after-free-vulnerability-in-windows-kernel\/","title":{"rendered":"CVE-2025-49761: Critical Use After Free Vulnerability in Windows Kernel<\/strong>"},"content":{"rendered":"

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

The cybersecurity landscape is continually evolving, with new vulnerabilities being discovered regularly. One recent discovery is CVE-2025-49761. This vulnerability, situated in the Windows Kernel, has the potential to put millions of users at risk due to its ability to allow an authorized attacker to elevate privileges<\/a> locally. This Use After Free vulnerability is significant, as it gives an attacker the chance to compromise a system or leak sensitive data<\/a>. Recognizing and understanding this vulnerability is the first step towards ensuring your system’s<\/a> security.<\/p>\n

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

CVE ID: CVE-2025-49761
\nSeverity: High (7.8)
\nAttack Vector: Local
\nPrivileges Required: User
\nUser Interaction: Required
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Windows 10 | All versions prior to latest patch
\nWindows Server 2019 | All versions prior to latest patch<\/p>\n

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

The vulnerability, CVE-2025-49761, is a Use After Free (UAF) bug in the Windows Kernel<\/a>. UAF vulnerabilities occur when an application continues to use memory<\/a> after it has been freed. In this particular case, an attacker with user-level access can trigger the UAF vulnerability<\/a> by executing a specially crafted application. This allows them to corrupt memory in a way that could allow them to execute arbitrary code<\/a> in the kernel context. This could ultimately lead to the attacker gaining elevated privileges<\/a>.<\/p>\n

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

Here is a conceptual example of how this exploit might be triggered, written in pseudocode:<\/p>\n

\/\/ The attacker creates a malicious application\nApplication malicious_app = new Application();\n\/\/ The application is designed to trigger the UAF vulnerability\nmalicious_app.triggerUAF();\n\/\/ The application then exploits the corrupted memory\nmalicious_app.exploitCorruptedMemory();\n\/\/ The application elevates its privileges\nmalicious_app.elevatePrivileges();\n\/\/ The attacker now has elevated privileges\nAttacker.attainElevatedPrivileges(malicious_app);<\/code><\/pre>\n
Remember, this is conceptual pseudocode and not actual code that could be used to exploit the vulnerability<\/a>. Its purpose is to illustrate the general process an attacker might follow to exploit this vulnerability.
\nIt is highly recommended to apply the vendor’s patch to mitigate this vulnerability. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity landscape is continually evolving, with new vulnerabilities being discovered regularly. One recent discovery is CVE-2025-49761. This vulnerability, situated in the Windows Kernel, has the potential to put millions of users at risk due to its ability to allow an authorized attacker to elevate privileges locally. This Use After Free vulnerability is significant, […]<\/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":[88,82],"product":[95],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-79348","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","vendor-microsoft","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