Elza Mathew

**Name of the Vulnerable Software and Affected Versions** Linux kernel versions prior to 5.16.0+ **Description** A race condition in the xsk socket teardown code can lead to a NULL pointer dereference. The issue arises when the `xsk unbind dev()` function sets `xs->state` to `XSK UNBOUND` and `xs->dev` to `NULL` before waiting for NAPI processing to terminate, which can cause a crash if another process is still using the socket. The problem is solved by removing the `NULL` assignment to `xs->dev` and extending the RCU critical region to cover the entire `xsk poll()`, `xsk sendmsg()`, and `xsk recvmsg()` functions. **Recommendations** For Linux kernel version 5.16.0+, update to a version that includes the fix for the xsk socket teardown code. For earlier versions, consider applying the patch that removes the `NULL` assignment to `xs->dev` and extends the RCU critical region to cover the entire `xsk poll()`, `xsk sendmsg()`, and `xsk recvmsg()` functions as a temporary workaround.