CVE-2026-5590
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
Race condition vulnerability during TCP connection teardown in an unspecified component. The tcp_recv() function may operate on a released connection. If tcp_conn_search() returns NULL while processing a SYN packet, a NULL pointer is passed to tcp_backlog_is_full() and dereferenced without validation, causing a crash.
Risk Assessment
An attacker can remotely cause a system crash (denial of service) by sending specially crafted SYN packets, exploiting the race condition.
Recommendation
Apply a patch from the operating system or TCP/IP stack vendor that fixes the race condition and adds NULL pointer validation.
Related vulnerabilities
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS