CVE-2023-52462 bpf: fix check for attempt to corrupt spilled pointer
A flaw in the Linux kernel BPF subsystem allows attackers to cause a denial of service via a null pointer dereference when handling spilled registers.
- 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-2023-52462?
CVE-2023-52462 is a medium-severity vulnerability in Linux kernel, published on 23 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:
bpf: fix check for attempt to corrupt spilled pointer
When register is spilled onto a stack as a 1/2/4-byte register, we set slot_type[BPF_REG_SIZE - 1] (plus potentially few more below it, depending on actual spill size). So to check if some stack slot has spilled register we need to consult slot_type[7], not slot_type[0].
To avoid the need to remember and double-check this in the future, just use is_spilled_reg() helper.
Weakness: CWE-476
Which versions are affected by CVE-2023-52462?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52462?
Apply the vendor's patch.
Is CVE-2023-52462 being exploited?
There is no known exploitation of CVE-2023-52462 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52462, DEBIAN-CVE-2023-52462, GHSA-8xf7-6cv9-64f7, UBUNTU-CVE-2023-52462.