CVE-2026-31676: Linux Kernel

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: rxrpc: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.

Affected products

• Linux Linux Kernel: from 2.6.22, before 6.6.136 (fixed in 6.6.136); from 6.7, before 6.12.84 (fixed in 6.12.84); from 6.13, before 6.18.23 (fixed in 6.18.23); from 6.19, before 6.19.13 (fixed in 6.19.13); version 7.0 only

Published 2026-04-25. Last modified 2026-06-17.