{"id":"CVE-2026-64525","summary":"xfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit\n\nThe struct pernet_operations docstring in include/net/net_namespace.h\nexplicitly warns against blocking RCU primitives in .exit handlers:\n\n    Exit methods using blocking RCU primitives, such as\n    synchronize_rcu(), should be implemented via exit_batch.\n    [...]\n    Please, avoid synchronize_rcu() at all, where it's possible.\n\n    Note that a combination of pre_exit() and exit() can\n    be used, since a synchronize_rcu() is guaranteed between\n    the calls.\n\nxfrm_policy_fini() violates this: it calls synchronize_rcu() before\nfreeing the policy_bydst hash tables (so no RCU reader is mid-\ntraversal at free time), but runs from xfrm_net_ops.exit -- once per\nnamespace -- so a cleanup_net() of N namespaces pays N full RCU\ngrace periods serially.\n\nUse the documented pre_exit/exit split. Move the policy flush (and\nthe workqueue drains it depends on) into a new .pre_exit handler;\nxfrm_policy_fini() then runs in .exit and frees the hash tables\nafter the synchronize_rcu_expedited() that cleanup_net() guarantees\nbetween the two phases. Providing O(1) RCU grace periods per batch\ninstead of O(N).\n\nObserved on Linux 6.18 with a workload doing unshare(CLONE_NEWNET)\nat ~13/sec sustained: cleanup_net() and the netns_wq rescuer kthread\nboth stuck in xfrm_policy_fini()'s synchronize_rcu(), \u003e300k struct\nnet accumulated in the cleanup queue, Percpu in /proc/meminfo climbed\nto 130+ GB on 256-CPU hosts, and memcg OOMs followed. setup_net and\n__put_net counts were balanced, ruling out a refcount leak.","modified":"2026-08-12T03:51:25.627974261Z","published":"2026-07-25T09:20:49.256Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64525.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3e52417318473782012b236d0325bf7d2266a597"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91cc13978ab0bc6f669139f53e7e613a860d10e0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bca6386dc08750fc7cdcbc7683473748ba3114b9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d14ae8ef88c2c6590e107db61b6adce148cec7b3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64525.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64525"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"438b1f668ad58f46ce699bb48e4698a7839e3f9e"},{"fixed":"bca6386dc08750fc7cdcbc7683473748ba3114b9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3733fce2871c9bca9dd18a1a23b1432ea215a094"},{"fixed":"91cc13978ab0bc6f669139f53e7e613a860d10e0"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"069daad4f2ae9c5c108131995529d5f02392c446"},{"fixed":"d14ae8ef88c2c6590e107db61b6adce148cec7b3"},{"fixed":"3e52417318473782012b236d0325bf7d2266a597"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"b66920a3348c0f63ba18365248fa21fbf0b3a937"},{"last_affected":"33a3149dd81a1e2f52b80ee1e0fc380b39f3d028"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.83"},{"fixed":"6.12.93"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.24"},{"fixed":"6.18.35"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.136"},{"fixed":"6.7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.19.14"},{"fixed":"6.20"}]}],"versions":["v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.18.34","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v6.18.26","v6.18.25","v6.18.24","v6.6.135","v6.19.13","v6.19.12","v6.6.134","v6.19.11","v6.6.133","v6.6.132","v6.19-rc2","v6.6.131","v6.19.10","v6.6.130","v6.19","v6.19.9","v6.6.129","v6.19.8","v6.19.7","v6.19.6","v6.6.128","v6.19.5","v6.6.127","v6.19.4","v6.19.3","v6.19.2","v6.6.126","v6.19.1","v6.6.125","v6.6.124","v6.6.123","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.6.122","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.6.121","v6.19-rc3","v6.6.120","v6.6.119","v6.18","v6.18-rc1","v6.6.118","v6.18-rc7","v6.18-rc3","v6.6.117","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.6.116","v6.18-rc4","v6.6.115","v6.6.114","v6.6.113","v6.6.112","v6.6.111","v6.6.110","v6.17","v6.17-rc7","v6.6.109","v6.17-rc1","v6.17-rc2","v6.6.108","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.6.107","v6.6.106","v6.6.105","v6.6.104","v6.6.103","v6.6.102","v6.6.101","v6.16-rc6","v6.6.100","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.6.99","v6.14-rc3","v6.6.98","v6.6.97","v6.6.96","v6.6.95","v6.6.94","v6.6.93","v6.15","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.6.92","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.6.91","v6.6.90","v6.15-rc5","v6.6.89","v6.14","v6.6.88","v6.6.87","v6.6.86","v6.6.85","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.6.84","v6.14-rc4","v6.14-rc5","v6.6.83","v6.14-rc2","v6.6.82","v6.6.81","v6.6.80","v6.6.79","v6.6.78","v6.13","v6.13-rc1","v6.6.77","v6.6.76","v6.6.75","v6.6.74","v6.13-rc6","v6.6.73","v6.6.72","v6.13-rc7","v6.13-rc2","v6.6.71","v6.13-rc5","v6.13-rc3","v6.6.70","v6.6.69","v6.12-rc1","v6.13-rc4","v6.6.68","v6.6.67","v6.6.66","v6.6.65","v6.6.64","v6.12","v6.6.63","v6.12-rc7","v6.6.62","v6.6.61","v6.12-rc3","v6.6.60","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.6.59","v6.12-rc2","v6.6.58","v6.6.57","v6.11-rc1","v6.6.56","v6.11-rc5","v6.6.55","v6.6.54","v6.11","v6.6.53","v6.6.52","v6.11-rc7","v6.6.51","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.6.50","v6.11-rc4","v6.6.49","v6.11-rc2","v6.6.48","v6.6.47","v6.10","v6.6.46","v6.6.45","v6.6.44","v6.6.43","v6.6.42","v6.6.41","v6.10-rc6","v6.6.40","v6.10-rc7","v6.6.39","v6.10-rc3","v6.9-rc1","v6.6.38","v6.10-rc5","v6.10-rc2","v6.6.37","v6.6.36","v6.10-rc4","v6.6.35","v6.9","v6.6.34","v6.6.33","v6.6.32","v6.6.31","v6.6.30","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.6.29","v6.6.28","v6.8-rc1","v6.6.27","v6.6.26","v6.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