CVE-2024-27431 cpumap: Zero-initialise xdp_rxq_info struct before running XDP program
An attacker can read uninitialized kernel memory via XDP programs attached to cpumap entries, potentially exposing sensitive data.
- 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-2024-27431?
CVE-2024-27431 is a high-severity vulnerability in Debian Debian Linux, published on 17 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:
cpumap: Zero-initialise xdp_rxq_info struct before running XDP program
When running an XDP program that is attached to a cpumap entry, we don't initialise the xdp_rxq_info data structure being used in the xdp_buff that backs the XDP program invocation. Tobias noticed that this leads to random values being returned as the xdp_md->rx_queue_index value for XDP programs running in a cpumap.
This means we're basically returning the contents of the uninitialised memory, which is bad. Fix this by zero-initialising the rxq data structure before running the XDP program.
Weakness: CWE-908
Which versions are affected by CVE-2024-27431?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-27431?
Apply the vendor's patch.
Is CVE-2024-27431 being exploited?
There is no known exploitation of CVE-2024-27431 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2024-27431, DEBIAN-CVE-2024-27431, GHSA-4h53-xcvw-8wpx, UBUNTU-CVE-2024-27431.