medium6.4
CVE-2026-5590
A race condition during TCP connection teardown can cause tcp_recv() to operate on a connection that has already been released.
Impact
A race condition during TCP connection teardown can cause tcp_recv() to operate on a connection that has already been released. If tcp_conn_search() returns NULL while processing a SYN packet, a NULL pointer derived from stale context data is passed to tcp_backlog_is_full() and dereferenced without validation, leading to a crash.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Zephyrproject | Zephyr | through 4.3.0 |