CVE-2023-4130 ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()
A flaw in the Linux kernel's ksmbd module allows attackers to cause denial of service or potentially execute code via improper buffer length validation in SMB2 requests.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-4130?
CVE-2023-4130 is a high-severity vulnerability in Linux kernel, published on 16 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()
There are multiple smb2_ea_info buffers in FILE_FULL_EA_INFORMATION request from client. ksmbd find next smb2_ea_info using ->NextEntryOffset of current smb2_ea_info. ksmbd need to validate buffer length Before accessing the next ea. ksmbd should check buffer length using buf_len, not next variable. next is the start offset of current ea that got from previous ea.
Which versions are affected by CVE-2023-4130?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-4130?
Apply the vendor's patch.
Is CVE-2023-4130 being exploited?
There is no known exploitation of CVE-2023-4130 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-4130, DEBIAN-CVE-2023-4130, GHSA-3ccm-2cr5-453p, UBUNTU-CVE-2023-4130.