CVE-2023-34320 arm: Guests can trigger a deadlock on Cortex-A77
A guest VM can trigger a CPU deadlock on Cortex-A77 cores via specific memory operations, causing a 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-2023-34320?
CVE-2023-34320 is a medium-severity denial of service vulnerability in Xen Xen, published on 8 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Cortex-A77 cores (r0p0 and r1p0) are affected by erratum 1508412 where software, under certain circumstances, could deadlock a core due to the execution of either a load to device or non-cacheable memory, and either a store exclusive or register read of the Physical Address Register (PAR_EL1) in close proximity.
Weakness: CWE-667
Which versions are affected by CVE-2023-34320?
It affects 2 products.
Products include Arm Cortex-A77 Firmware, Xen Xen.
How do I fix CVE-2023-34320?
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-2023-34320 being exploited?
There is no known exploitation of CVE-2023-34320 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2023-34320, DEBIAN-CVE-2023-34320, GHSA-75hw-9685-7hff, UBUNTU-CVE-2023-34320.