CVE-2026-5590
Medium
Description
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.
SeverityMedium
CVSS6.4
Exploit probability—
ProductZephyr
PublishedApr 5, 2026
First seenApr 5, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zephyrproject zephyr | v ≤ 4.3.0 | — |
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