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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-43091

xfrm: Wait for RCU readers during policy netns exit

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e1e551bc56302b80ff930c966f9985095fb1b70d to < b2faee12538b5b008eaef65a4201eb29cb5cefb3affected
  • e1e551bc56302b80ff930c966f9985095fb1b70d to < b66920a3348c0f63ba18365248fa21fbf0b3a937affected
  • e1e551bc56302b80ff930c966f9985095fb1b70d to < 438b1f668ad58f46ce699bb48e4698a7839e3f9eaffected
  • e1e551bc56302b80ff930c966f9985095fb1b70d to < 3733fce2871c9bca9dd18a1a23b1432ea215a094affected
  • e1e551bc56302b80ff930c966f9985095fb1b70d to < 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028affected
  • e1e551bc56302b80ff930c966f9985095fb1b70d to < 069daad4f2ae9c5c108131995529d5f02392c446affected

Linux Linux

Default version status: affected

  • 4.9affected
  • 0 to < 4.9unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.136 to ≤ 6.6.*unaffected
  • 6.12.83 to ≤ 6.12.*unaffected
  • 6.18.24 to ≤ 6.18.*unaffected
  • 6.19.14 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References