CVE-2023-52628 netfilter: nftables: exthdr: fix 4-byte stack OOB write
A stack out-of-bounds write in the Linux kernel netfilter subsystem allows attackers to corrupt memory, potentially leading to code execution or privilege escalation.
- 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-2023-52628?
CVE-2023-52628 is a high-severity memory corruption vulnerability in Linux kernel, published on 28 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: nftables: exthdr: fix 4-byte stack OOB write
If priv->len is a multiple of 4, then dst[len / 4] can write past the destination array which leads to stack corruption.
This construct is necessary to clean the remainder of the register in case ->len is NOT a multiple of the register size, so make it conditional just like nft_payload.c does.
The bug was added in 4.1 cycle and then copied/inherited when tcp/sctp and ip option support was added.
Bug reported by Zero Day Initiative project (ZDI-CAN-21950, ZDI-CAN-21951, ZDI-CAN-21961).
Weakness: CWE-787
Which versions are affected by CVE-2023-52628?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52628?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-52628 being exploited?
There is no known exploitation of CVE-2023-52628 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52628, DEBIAN-CVE-2023-52628, GHSA-6r42-gm3x-9xx3, UBUNTU-CVE-2023-52628.