Linux Kernel Vulnerability in TLS Stream Handling
CVE-2025-39946
Key Information:
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What is CVE-2025-39946?
CVE-2025-39946 is a vulnerability found in the Linux kernel that affects the handling of TLS (Transport Layer Security) streams. The Linux kernel, a core component of many operating systems, is crucial for managing hardware-software interactions and ensuring system stability. This vulnerability arises when the kernel mismanages the processing of TLS stream headers, leading to a scenario where an invalid record could result in a buffer overflow. Such a flaw can create severe security risks, as it may allow attackers to exploit the vulnerability and potentially execute arbitrary code within the affected system. The handling error occurs specifically when records are read prematurely, complicating the ability to abort connections when encountering invalid data.
Potential impact of CVE-2025-39946
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Arbitrary Code Execution: The primary concern with CVE-2025-39946 is that it facilitates the potential for attackers to execute arbitrary code on affected systems, which can lead to unauthorized access and control over sensitive data.
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Denial of Service: Attackers can exploit this vulnerability to create conditions that cause the affected systems to become unresponsive, leading to denial-of-service situations that disrupt normal operations and incapacitate services.
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Data Integrity Compromise: Given that this vulnerability affects TLS stream handling, it poses a significant risk to data integrity. Man-in-the-middle attacks could be facilitated, where attackers could alter or inject malicious data into communications protected by TLS, thereby compromising the trustworthiness of transmitted information.
Affected Version(s)
Linux 84c61fe1a75b4255df1e1e7c054c9e6d048da417
Linux 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < 4cefe5be73886f383639fe0850bb72d5b568a7b9
Linux 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < 208640e6225cc929a05adbf79d1df558add3e231
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.