CVE-2024-27397 netfilter: nf_tables: use timestamp to check for set element timeout
A use-after-free vulnerability in the Linux kernel netfilter subsystem allows attackers to execute arbitrary code or escalate privileges.
- 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-2024-27397?
CVE-2024-27397 is a high-severity use after free vulnerability in Linux kernel, published on 9 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:
netfilter: nf_tables: use timestamp to check for set element timeout
Add a timestamp field at the beginning of the transaction, store it in the nftables per-netns area.
Update set backend .insert, .deactivate and sync gc path to use the timestamp, this avoids that an element expires while control plane transaction is still unfinished.
.lookup and .update, which are used from packet path, still use the current time to check if the element has expired. And .get path and dump also since this runs lockless under rcu read size lock. Then, there is async gc which also needs to check the current time since it runs asynchronously from a workqueue.
Weakness: CWE-416
Which versions are affected by CVE-2024-27397?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-27397?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2024-27397 being exploited?
There is no known exploitation of CVE-2024-27397 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-40546, AZL-40679, BELL-CVE-2024-27397, DEBIAN-CVE-2024-27397, GHSA-wmww-v28q-953g, UBUNTU-CVE-2024-27397.