CVE-2024-50269
CVE-2024-50269 is a vulnerability in the Linux kernel related to the usb subsystem, specifically the musb driver for sunxi platforms. It involves accessing a released USB PHY, potentially leading to system instability or crashes. Given an SVRS of 30, this vulnerability is considered low severity and does not require immediate action, but should be addressed in due course. This issue occurs due to an incorrect order of operations in the driver's initialization and exit routines, where the USB PHY is released prematurely. This means that a subsequent attempt to use the PHY results in accessing already freed memory. The fix involves reverting a commit that introduced the premature release. While the CVSS score is 0, the SVRS acknowledges some level of risk, potentially because of the Linux Kernel's widespread use. This highlights the importance of applying the provided patch to ensure system stability.
Description
CVE-2024-50269 is a vulnerability in the Linux kernel related to the handling of USB PHY (Physical Layer) resources in Sunxi SoCs. The issue arises from a race condition where the USB PHY can be accessed after it has been released, potentially leading to memory corruption or system instability. This vulnerability is classified as a moderate risk with a SVRS score of 30.
Key Insights
- Race Condition: The vulnerability exploits a race condition in the Linux kernel's USB driver for Sunxi SoCs. This race condition occurs when the USB PHY is released before it is fully unused.
- Memory Corruption: If the USB PHY is accessed after it has been released, it can lead to memory corruption. This memory corruption could be exploited by attackers to gain unauthorized access or compromise the system.
- System Instability: The vulnerability could also lead to system instability, such as crashes or hangs.
- Limited Impact: The CVSS score of 0 and the SVRS score of 30 indicate a moderate impact. While the vulnerability is exploitable, it requires specific conditions and might not be widely exploited in the wild.
Mitigation Strategies
- Update Kernel: The most effective mitigation strategy is to update the Linux kernel to the latest version containing the patch for CVE-2024-50269. This patch reverts the commit that introduced the vulnerability, addressing the race condition and preventing the USB PHY from being accessed after release.
- Disable USB Devices: As a temporary mitigation strategy, consider disabling unnecessary USB devices. This reduces the potential attack surface by limiting the number of USB devices connected to the system.
- System Hardening: Implement general system hardening practices, such as limiting user privileges, enabling security features, and regularly patching vulnerabilities. This reduces the overall risk of attacks, even if the vulnerability is exploited.
- Monitor Network Traffic: Continuously monitor network traffic for suspicious activity. This can help identify potential exploits targeting the vulnerability, allowing for timely response and mitigation.
Additional Information
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