CVE-2019-10125 : What You Need to Know

A vulnerability was found in aio_poll() in the fs/aio.c file of the Linux kernel up to version 5.0.4, leading to a use-after-free issue.

Understanding CVE-2019-10125

This CVE identifies a specific vulnerability in the Linux kernel affecting versions up to 5.0.4.

What is CVE-2019-10125?

CVE-2019-10125 is a flaw in the aio_poll() function in the Linux kernel that can result in a use-after-free issue when certain events occur immediately after the vfs_poll() function returns.

The Impact of CVE-2019-10125

The vulnerability could be exploited to trigger a use-after-free condition, potentially leading to a system crash or arbitrary code execution.

Technical Details of CVE-2019-10125

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises in aio_poll() in fs/aio.c in the Linux kernel through version 5.0.4. If a specific event occurs right after the vfs_poll() function returns, aio_poll_wake() may release a file prematurely, causing a use-after-free vulnerability.

Affected Systems and Versions

Affected System: Linux kernel
Affected Versions: Up to version 5.0.4

Exploitation Mechanism

The vulnerability can be exploited by triggering an anticipated event immediately after the vfs_poll() function returns, such as the closure of a pair of pipes, leading to the premature release of a file.

Mitigation and Prevention

Protecting systems from CVE-2019-10125 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply official patches provided by the Linux kernel maintainers.
Monitor security advisories for updates and apply them promptly.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement proper access controls and monitoring mechanisms to detect unusual behavior.

Patching and Updates

Regularly check for security updates from the Linux kernel maintainers and apply patches promptly to mitigate the vulnerability.