CVE-2024-26910 netfilter: ipset: fix performance regression in swap operation
A race condition in the Linux kernel's ipset swap operation causes performance regression, potentially leading to 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-2024-26910?
CVE-2024-26910 is a medium-severity vulnerability in Linux kernel, published on 17 Apr 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: ipset: fix performance regression in swap operation
The patch "netfilter: ipset: fix race condition between swap/destroy and kernel side add/del/test", commit 28628fa9 fixes a race condition. But the synchronize_rcu() added to the swap function unnecessarily slows it down: it can safely be moved to destroy and use call_rcu() instead.
Eric Dumazet pointed out that simply calling the destroy functions as rcu callback does not work: sets with timeout use garbage collectors which need cancelling at destroy which can wait. Therefore the destroy functions are split into two: cancelling garbage collectors safely at executing the command received by netlink and moving the remaining part only into the rcu callback.
Weakness: CWE-362
Which versions are affected by CVE-2024-26910?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26910?
Apply the vendor's patch.
Is CVE-2024-26910 being exploited?
There is no known exploitation of CVE-2024-26910 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-26910, DEBIAN-CVE-2024-26910, GHSA-4p7x-7wc6-4gf5, UBUNTU-CVE-2024-26910.