Buffer Allocation Vulnerability in Linux Kernel - CVE-2025-38495
Summary
CVE-2025-38495: In the Linux kernel, the following vulnerability has been resolved: HID: core: ensure the allocated report buffer can contain the reserved report ID When the report ID is not used, the low level transport drivers expect... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It supports a wide range of hardware architectures and is known for its stability, performance, and security features. However, vulnerabilities can arise, such as the one identified in CVE-2025-38495, which affects the HID (Human Interface Device) subsystem, potentially compromising system integrity.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the HID core where the allocated report buffer does not account for the reserved report ID. When the report ID is not used, low-level transport drivers expect the first byte of the buffer to be 0. The current implementation only guarantees 7 bytes instead of the required 8 bytes, which can lead to unexpected behavior and potential exploitation by malicious actors.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can ensure that the first byte of the report buffer is manually set to 0 in their implementation, although this is not a permanent fix and should not replace updating the kernel.
Conclusion
CVE-2025-38495 represents a significant vulnerability in the Linux kernel's HID subsystem, necessitating prompt attention from users to ensure system security. By updating to the latest kernel version, users can protect their systems from potential exploitation.
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FAQ
CVE-2025-38495 is a vulnerability in the Linux kernel's HID subsystem that affects the allocation of report buffers, potentially leading to system exploitation.
If exploited, this vulnerability could allow unauthorized access or manipulation of system resources, compromising the security and stability of the operating system.
Yes, a patch is available. Users should update their Linux kernel to the latest version to mitigate the risk associated with this vulnerability.
You can use tools like Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file, you can check for vulnerabilities like CVE-2025-38495.
If an immediate update is not possible, consider implementing the workaround of ensuring the first byte of the report buffer is set to 0, but plan to update as soon as feasible.
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