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Vulnerability DatabaseCVE-2025-39777
CVE-2025-39777:
Linux Kernel vulnerability analysis and mitigation
Overview
In the Linux kernel, a vulnerability (CVE-2025-39777) was identified related to Control Flow Integrity (CFI) failure in the crypto: acomp component. The vulnerability was disclosed on September 11, 2025, affecting Linux kernel systems with CFI enabled (NVD, Debian).
Technical details
The vulnerability stems from type punning issues in the crypto: acomp component of the Linux kernel. Specifically, the issue involves inconsistent type usage in the workspace ("stream") free function, which could lead to CFI failures. The fix involves ensuring consistent type usage and proper function pointer typing for the free function (NVD).
Impact
When Control Flow Integrity is enabled, this vulnerability could potentially lead to system crashes due to CFI failures (NVD).
Mitigation and workarounds
The vulnerability has been fixed in multiple Linux distributions including Debian Bullseye (5.10.223-1), Bookworm (6.1.148-1), and Trixie (6.12.43-1). Users are advised to update to the patched versions (Debian).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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