CVE-2021-46953 ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure
A flaw in the Linux kernel ACPI GTDT driver allows unmapping valid interrupts on probe failure, potentially causing system instability or denial of service.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-46953?
CVE-2021-46953 is a medium-severity vulnerability in Linux kernel, published on 27 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:
ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure
When failing the driver probe because of invalid firmware properties, the GTDT driver unmaps the interrupt that it mapped earlier.
However, it never checks whether the mapping of the interrupt actially succeeded. Even more, should the firmware report an illegal interrupt number that overlaps with the GIC SGI range, this can result in an IPI being unmapped, and subsequent fireworks (as reported by Dann Frazier).
Rework the driver to have a slightly saner behaviour and actually check whether the interrupt has been mapped before unmapping things.
Which versions are affected by CVE-2021-46953?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-46953?
Apply the vendor's patch.
Is CVE-2021-46953 being exploited?
There is no known exploitation of CVE-2021-46953 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-46953, GHSA-2wwc-57w4-gp7m, UBUNTU-CVE-2021-46953.