CVE-2020-14386

What it actually does

The vulnerability allows memory corruption in the Linux kernel, enabling an unprivileged process to gain root privileges.

Why it matters to the business

Systems running vulnerable kernels can be fully compromised by local attackers, leading to unauthorized access to sensitive data and system control.

How an attack unfolds

An attacker with local unprivileged access crafts input to trigger memory corruption in the kernel, overwriting critical structures to escalate to root privileges.

How to fix it

Upgrade the Linux kernel to a version containing commit acf69c946233259ab4d64f8869d4037a198c7f06 or later, equivalent to kernel 5.9-rc4 or newer.

How to confirm the fix worked

Verify the running kernel version is at least 5.9-rc4 and confirm the fix commit is present in the source tree.

Typical attack path

1. Obtain local unprivileged access to the system
2. Trigger the memory corruption flaw via crafted input
3. Overwrite kernel structures to escalate privileges
4. Gain root access and perform further actions

How to detect it

Review system logs for unusual kernel activity, privilege changes, or crashes coinciding with local process execution; audit for processes unexpectedly running as root.

What your security team should do

• Apply kernel updates to all affected systems without delay
• Enforce least privilege for user accounts to limit local access
• Monitor systems for unexpected privilege escalations