CVE-2026-43091

A flaw was found in the Linux kernel XFRM IPsec policy teardown path. xfrm_policy_fini() freed policy_bydst hash tables without waiting for concurrent RCU readers to finish even though those tables are published with rcu_assign_pointer() and read via RCU. That could allow use-after-free access during network namespace exit. Upstream waits for an RCU grace period (synchronize_rcu()) before freeing the hash table memory.

Red Hat acknowledges the upstream Linux kernel correction for «xfrm» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.