CVE-2023-2593 Kernel: ksmbd memory exhaustion denial-of-service vulnerability
An unauthenticated attacker can cause a denial of service by exhausting memory through new TCP connections in the Linux kernel.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-2593?
CVE-2023-2593 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 30 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw exists within the Linux kernel's handling of new TCP connections. The issue results from the lack of memory release after its effective lifetime. This vulnerability allows an unauthenticated attacker to create a denial of service condition on the system.
Weakness: CWE-835
Which versions are affected by CVE-2023-2593?
How do I fix CVE-2023-2593?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-2593 being exploited?
There is no known exploitation of CVE-2023-2593 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2023-2593, GHSA-595c-mc93-mp4p, UBUNTU-CVE-2023-2593.