CVE-2024-26643 netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout
A race condition in Linux kernel netfilter allows asynchronous garbage collection to access released anonymous sets, potentially causing a system crash.
- 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-2024-26643?
CVE-2024-26643 is a high-severity vulnerability in Debian Debian Linux, published on 21 Mar 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:
netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout
While the rhashtable set gc runs asynchronously, a race allows it to collect elements from anonymous sets with timeouts while it is being released from the commit path.
Mingi Cho originally reported this issue in a different path in 6.1.x with a pipapo set with low timeouts which is not possible upstream since 7395dfacfff6 ("netfilter: nf_tables: use timestamp to check for set element timeout").
Fix this by setting on the dead flag for anonymous sets to skip async gc in this case.
According to 08e4c8c5919f ("netfilter: nf_tables: mark newset as dead on transaction abort"), Florian plans to accelerate abort path by releasing objects via workqueue, therefore, this sets on the dead flag for abort path too.
Weakness: CWE-667
Which versions are affected by CVE-2024-26643?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-26643?
Apply the vendor's patch.
Is CVE-2024-26643 being exploited?
There is no known exploitation of CVE-2024-26643 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2024-26643, DEBIAN-CVE-2024-26643, GHSA-ph5r-c8gc-xg6f, UBUNTU-CVE-2024-26643.