{
  "cveId": "CVE-2026-64525",
  "url": "https://patchblox.com/security/cve/CVE-2026-64525",
  "summary": "CVE-2026-64525 is fixed in 52 products on 1 platform, first by ALAS2023-2026-1881, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "xfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit  The struct pernet_operations docstring in include/net/net_namespace.h explicitly warns against blocking RCU primitives in .exit handlers:      Exit methods using blocking RCU primitives, such as     synchronize_rcu(), should be implemented via exit_batch.     [...]     Please, avoid synchronize_rcu() at all, where it\u0027s possible.      Note that a combination of pre_exit() and exit() can     be used, since a synchronize_rcu() is guaranteed between     the calls.  xfrm_policy_fini() violates this: it calls synchronize_rcu() before freeing the policy_bydst hash tables (so no RCU reader is mid- traversal at free time), but runs from xfrm_net_ops.exit -- once per namespace -- so a cleanup_net() of N namespaces pays N full RCU grace periods serially.  Use the documented pre_exit/exit split. Move the policy flush (and the workqueue drains it depends on) into a new .pre_exit handler; xfrm_policy_fini() then runs in .exit and frees the hash tables after the synchronize_rcu_expedited() that cleanup_net() guarantees between the two phases. Providing O(1) RCU grace periods per batch instead of O(N).  Observed on Linux 6.18 with a workload doing unshare(CLONE_NEWNET) at ~13/sec sustained: cleanup_net() and the netns_wq rescuer kthread both stuck in xfrm_policy_fini()\u0027s synchronize_rcu(), \u003E300k struct net accumulated in the cleanup queue, Percpu in /proc/meminfo climbed to 130\u002B GB on 256-CPU hosts, and memcg OOMs followed. setup_net and __put_net counts were balanced, ruling out a refcount leak.",
  "published": "2026-06-22T09:00:00Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00156,
  "epssPercentile": 0.04808,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64525",
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