CVE-2024-27403 netfilter: nft_flow_offload: reset dst in route object after setting up flow
A double release of a destination object in the Linux kernel netfilter flow offload path can cause a refcount underflow, leading to a 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-2024-27403?
CVE-2024-27403 is a high-severity use after free vulnerability in Linux kernel, 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:
netfilter: nft_flow_offload: reset dst in route object after setting up flow
dst is transferred to the flow object, route object does not own it anymore. Reset dst in route object, otherwise if flow_offload_add() fails, error path releases dst twice, leading to a refcount underflow.
Which versions are affected by CVE-2024-27403?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-27403?
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-2024-27403 being exploited?
There is no known exploitation of CVE-2024-27403 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-27403, DEBIAN-CVE-2024-27403, GHSA-hh8j-q6h7-p5m3, ROOT-OS-DEBIAN-11-CVE-2024-27403, UBUNTU-CVE-2024-27403.