CVE-2023-53218 rxrpc: Make it so that a waiting process can be aborted
A flaw in the Linux kernel's rxrpc module allows a waiting process to hang indefinitely, causing a denial of service until patched.
- 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-2023-53218?
CVE-2023-53218 is a high-severity denial of service vulnerability in Linux kernel, published on 15 Sep 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:
rxrpc: Make it so that a waiting process can be aborted
When sendmsg() creates an rxrpc call, it queues it to wait for a connection and channel to be assigned and then waits before it can start shovelling data as the encrypted DATA packet content includes a summary of the connection parameters.
However, sendmsg() may get interrupted before a connection gets assigned and further sendmsg() calls will fail with EBUSY until an assignment is made.
Fix this so that the call can at least be aborted without failing on EBUSY. We have to be careful here as sendmsg() mustn't be allowed to start the call timer if the call doesn't yet have a connection assigned as an oops may follow shortly thereafter.
Which versions are affected by CVE-2023-53218?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53218?
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-2023-53218 being exploited?
There is no known exploitation of CVE-2023-53218 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-71227, BELL-CVE-2023-53218, DEBIAN-CVE-2023-53218, GHSA-749j-m4j7-mhr2, ROOT-OS-DEBIAN-11-CVE-2023-53218, ROOT-OS-DEBIAN-12-CVE-2023-53218 and 2 more.