CVE-2021-47373 irqchip/gic-v3-its: Fix potential VPE leak on error
An off-by-one error in the Linux kernel GICv3 ITS driver can cause a VPE memory leak, potentially leading to resource exhaustion and denial of service.
- 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-2021-47373?
CVE-2021-47373 is a medium-severity memory corruption vulnerability in Linux kernel, published on 21 May 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:
irqchip/gic-v3-its: Fix potential VPE leak on error
In its_vpe_irq_domain_alloc, when its_vpe_init() returns an error, there is an off-by-one in the number of VPEs to be freed.
Fix it by simply passing the number of VPEs allocated, which is the index of the loop iterating over the VPEs.
[maz: fixed commit message]
Weakness: CWE-193
Which versions are affected by CVE-2021-47373?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47373?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-47373 being exploited?
There is no known exploitation of CVE-2021-47373 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47373, GHSA-m9r6-94f7-4j6m, UBUNTU-CVE-2021-47373.