CVE-2023-53218: rxrpc: Make it so that a waiting process can be aborted

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-15 · updated 2026-06-17

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.

Affected products

Linux kernel: from 4.11 before 6.2.16; from 6.3 before 6.3.3 — fixed in 6.2.16, 6.3.3

How to fix

Upgrade to a fixed version: Linux kernel 6.2.16, 6.3.3. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-53218 or the next vulnerability affects your stack