CVE-2019-19602 : Vulnerability Insights and Analysis

The Linux kernel versions prior to 5.4.2 have a vulnerability in the fpregs_state_valid function, enabling attackers to manipulate memory, leading to denial of service or other consequences.

Understanding CVE-2019-19602

This CVE involves a vulnerability in the Linux kernel that can be exploited when using GCC 9, potentially causing a denial of service or other impacts.

What is CVE-2019-19602?

Vulnerability in the fpregs_state_valid function in the Linux kernel
Exploitable when GCC 9 is utilized
Allows attackers to manipulate memory, leading to denial of service

The Impact of CVE-2019-19602

Enables attackers to manipulate memory
Can result in denial of service or other unspecified consequences

Technical Details of CVE-2019-19602

This section provides technical details about the vulnerability.

Vulnerability Description

Vulnerability in fpregs_state_valid function in the Linux kernel
Incorrect caching of fpu_fpregs_owner_ctx
Mishandling of signal-based non-cooperative preemption

Affected Systems and Versions

Linux kernel versions prior to 5.4.2
Specifically observed in Go 1.14 prereleases on amd64

Exploitation Mechanism

Vulnerability occurs when using GCC 9
Attackers can exploit incorrect caching of fpu_fpregs_owner_ctx

Mitigation and Prevention

Here are the steps to mitigate and prevent exploitation of CVE-2019-19602.

Immediate Steps to Take

Update Linux kernel to version 5.4.2 or newer
Apply patches provided by the Linux kernel maintainers

Long-Term Security Practices

Regularly update software and systems
Monitor security advisories for the Linux kernel

Patching and Updates

Keep the Linux kernel updated to the latest version
Apply security patches promptly