CVE-2021-47009 KEYS: trusted: Fix memory leak on object td
A memory leak in the Linux kernel's trusted keys subsystem allows attackers to cause a denial of service by exhausting system memory.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47009?
CVE-2021-47009 is a medium-severity denial of service vulnerability in Linux kernel, published on 28 Feb 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
KEYS: trusted: Fix memory leak on object td
Two error return paths are neglecting to free allocated object td, causing a memory leak. Fix this by returning via the error return path that securely kfree's td.
Fixes clang scan-build warning: security/keys/trusted-keys/trusted_tpm1.c:496:10: warning: Potential memory leak [unix.Malloc]
Weakness: CWE-401
Which versions are affected by CVE-2021-47009?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47009?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-47009 being exploited?
There is no known exploitation of CVE-2021-47009 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47009, GHSA-fq4x-x6f2-9q95, UBUNTU-CVE-2021-47009.