CVE-2026-43091High· 7.8▾ TwilightIn 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 policie…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
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.
Linux >= e1e551bc56302b80ff930c966f9985095fb1b70d < b66920a3348c0f63ba18365248fa21fbf0b3a937Linux >= e1e551bc56302b80ff930c966f9985095fb1b70d < 438b1f668ad58f46ce699bb48e4698a7839e3f9eLinux >= e1e551bc56302b80ff930c966f9985095fb1b70d < 3733fce2871c9bca9dd18a1a23b1432ea215a094Linux >= e1e551bc56302b80ff930c966f9985095fb1b70d < 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028Linux >= e1e551bc56302b80ff930c966f9985095fb1b70d < 069daad4f2ae9c5c108131995529d5f02392c446Linux 4.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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