CVE-2026-43091 POC (Proof-of-Concept)

In the Linux kernel, the following vulnerability has been resolved:
xfrm: Wait for RCU readers during policy netns exit
xfrm_policy_fini() frees the policy_bydst hash tables after flushing the
policy work items and deleting all policies, but it does not wait for
concurrent RCU readers to leave their read-side critical sections first.
The policy_bydst tables are published via rcu_assign_pointer() and are
looked up through rcu_dereference_check(), so netns teardown must also
wait for an RCU grace period before freeing the table memory.
Fix this by adding synchronize_rcu() before freeing the policy hash tables.

Published: 2026-05-06

CVSS: 7.8

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Download CVE-2026-43091 POC (Proof-of-Concept) here:

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https://hokyo.gr/poc-537-cve-2025-31976/

https://hokyo.gr/poc-2-cve-2026-5405/

https://hokyo.gr/poc-698-cve-2026-33589/