CVE-2023-53033 netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits
Incorrect arithmetic in Linux kernel netfilter VLAN handling can cause memory corruption, leading to denial of service or information disclosure.
- 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-2023-53033?
CVE-2023-53033 is a high-severity vulnerability in Linux kernel, published on 27 Mar 2025. 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_payload: incorrect arithmetics when fetching VLAN header bits
If the offset + length goes over the ethernet + vlan header, then the length is adjusted to copy the bytes that are within the boundaries of the vlan_ethhdr scratchpad area. The remaining bytes beyond ethernet + vlan header are copied directly from the skbuff data area.
Fix incorrect arithmetic operator: subtract, not add, the size of the vlan header in case of double-tagged packets to adjust the length accordingly to address CVE-2023-0179.
Which versions are affected by CVE-2023-53033?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53033?
Apply the vendor's patch.
Is CVE-2023-53033 being exploited?
There is no known exploitation of CVE-2023-53033 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-53033, DEBIAN-CVE-2023-53033, GHSA-rfj2-m755-7qfc, UBUNTU-CVE-2023-53033.