CVE-2019-12380 : What You Need to Know

The Linux kernel, specifically the efi subsystem, has a problem that was found in versions up to 5.1.5. There is a dispute regarding this issue, as some argue that it is not a problem because the affected code runs only during the boot process.

Understanding CVE-2019-12380

This CVE involves a vulnerability in the Linux kernel's efi subsystem.

What is CVE-2019-12380?

The issue relates to the mishandling of memory allocation failures in specific functions within the efi subsystem of the Linux kernel.

The Impact of CVE-2019-12380

There is a dispute over the severity of this issue, with some arguing that it is not exploitable by unprivileged users due to the code running before user processes start.

Technical Details of CVE-2019-12380

This section provides more technical insights into the vulnerability.

Vulnerability Description

The problem lies in the phys_efi_set_virtual_address_map function in efi.c and the efi_call_phys_prolog function in efi_64.c, where memory allocation failures are mishandled.

Affected Systems and Versions

Versions up to 5.1.5 of the Linux kernel are impacted.

Exploitation Mechanism

The vulnerability occurs during the boot process before user processes start, limiting the possibility of exploitation by unprivileged users.

Mitigation and Prevention

Protecting systems from CVE-2019-12380 requires specific actions.

Immediate Steps to Take

Monitor official sources for patches and updates.
Implement secure boot configurations.
Limit physical access to systems.

Long-Term Security Practices

Regularly update the Linux kernel to patched versions.
Conduct security audits to identify and mitigate potential vulnerabilities.

Patching and Updates

Apply patches provided by Linux kernel maintainers to address the vulnerability.