{"id":"CVE-2026-64580","summary":"xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()\n\nOn the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst()\nreleases the device reference with netdev_put() but leaves\nxdst-\u003eu.dst.dev set. dst_destroy() later calls netdev_put(dst-\u003edev)\nagain, so the same net_device reference is released twice, underflowing\nits refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for\n\u003cdev\u003e to become free\").\n\nClear xdst-\u003eu.dst.dev after the netdev_put(), the same way the XFRM\ndevice-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in\nnet/xfrm/xfrm_device.c NULL -\u003edev when releasing the reference on error.\n\n  ref_tracker: reference already released.\n  ref_tracker: allocated in:\n   xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86)\n   ...\n   udpv6_sendmsg (net/ipv6/udp.c:1696)\n   ...\n  ref_tracker: freed in:\n   xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90)\n   ...\n  WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780\n   dst_destroy (net/core/dst.c:115)\n   rcu_core\n   handle_softirqs\n   ...","modified":"2026-08-09T03:47:25.832357640Z","published":"2026-08-05T08:09:34.946Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64580.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64580.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64580"},{"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":"84c4a9dfbf430861e7588d95ae3ff61535dca351"},{"fixed":"df6856c2dda9187601d29b5fbd7a81b3b178cedf"},{"fixed":"43de8a49335e611adb271bbd52e84dfbc11fc185"},{"fixed":"ff636d7b7cba6dea82ecf580415ea57f2c1a11b6"},{"fixed":"e078da1b4e11390cff3201c19a9a1fe70c5b934f"},{"fixed":"136992de9bb91871084ae52d172610541c76e4d2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"a7e22d0c0e81dde129a51ee413644124f4b59954"},{"last_affected":"01b0d887f67a388fb2a658ee2bdd74e5ba146818"},{"last_affected":"a98124aac0b5adc5de8ae54f11322781cb4d85c3"},{"last_affected":"e27b7bee743d921f037b1da6f071237345bef7c1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.0.79"},{"fixed":"3.1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.2.46"},{"fixed":"3.3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.4.46"},{"fixed":"3.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.9.3"},{"fixed":"3.10"}]}],"versions":["v3.2.45","v3.9","v3.9.2","v3.4.45","v3.0.78","v3.2.44","v3.4.44","v3.0.77","v3.9.1","v3.0.76","v3.4.43","v3.9-rc2","v3.9-rc7","v3.4.42","v3.0.75","v3.9-rc8","v3.0.74","v3.4.41","v3.2.43","v3.9-rc3","v3.9-rc6","v3.9-rc5","v3.4.40","v3.0.73","v3.4.39","v3.0.72","v3.9-rc4","v3.9-rc1","v3.2.42","v3.8","v3.0.71","v3.4.38","v3.4.37","v3.0.70","v3.2.41","v3.4.36","v3.0.69","v3.2.40","v3.0.68","v3.4.35","v3.2.39","v3.0.67","v3.4.34","v3.4.33","v3.0.66","v3.8-rc7","v3.4.32","v3.0.65","v3.8-rc6","v3.2.38","v3.8-rc5","v3.4.31","v3.0.64","v3.4.30","v3.0.63","v3.8-rc2","v3.4.29","v3.0.62","v3.2.37","v3.4.28","v3.0.61","v3.8-rc1","v3.8-rc3","v3.8-rc4","v3.4.27","v3.0.60","v3.4.26","v3.0.59","v3.4.25","v3.0.58","v3.2.36","v3.7","v3.4.24","v3.0.57","v3.2.35","v3.0.56","v3.4.23","v3.7-rc1","v3.6","v3.7-rc6","v3.7-rc7","v3.4.22","v3.0.55","v3.7-rc3","v3.7-rc8","v3.2.34","v3.0.54","v3.4.21","v3.0.53","v3.4.20","v3.7-rc2","v3.4.19","v3.0.52","v3.7-rc4","v3.7-rc5","v3.4.18","v3.0.51","v3.2.33","v3.4.17","v3.0.50","v3.4.16","v3.0.49","v3.2.32","v3.4.15","v3.0.48","v3.0.47","v3.4.14","v3.0.46","v3.2.31","v3.4.13","v3.0.45","v3.2.30","v3.6-rc7","v3.4.12","v3.0.44","v3.6-rc1","v3.5-rc3","v3.4.11","v3.0.43","v3.6-rc6","v3.6-rc5","v3.5","v3.6-rc3","v3.6-rc4","v3.2.29","v3.6-rc2","v3.0.42","v3.4.10","v3.2.28","v3.4-rc4","v3.0.41","v3.4.9","v3.2.27","v3.0.40","v3.4.8","v3.2.26","v3.4.7","v3.0.39","v3.2.25","v3.2.24","v3.0.38","v3.4.6","v3.5-rc7","v3.2.23","v3.5-rc5","v3.5-rc6","v3.4.5","v3.0.37","v3.4.4","v3.0.36","v3.5-rc2","v3.2.22","v3.5-rc1","v3.5-rc4","v3.2.21","v3.4","v3.4.3","v3.0.35","v3.2.20","v3.0.34","v3.4.2","v3.2.19","v3.4.1","v3.0.33","v3.0.32","v3.2.18","v3.4-rc2","v3.4-rc1","v3.0.31","v3.2.17","v3.4-rc7","v3.4-rc6","v3.4-rc3","v3.4-rc5","v3.2.16","v3.0.30","v3.0.29","v3.0.28","v3.2.15","v3.3","v3.2.14","v3.0.27","v3.2.13","v3.0.26","v3.3-rc6","v3.3-rc3","v3.2.12","v3.0.25","v3.3-rc7","v3.2.11","v3.0.24","v3.3-rc2","v3.3-rc5","v3.2","v3.2.10","v3.3-rc4","v3.2.9","v3.0.23","v3.3-rc1","v3.0.22","v3.2.8","v3.2.7","v3.0.21","v3.2.6","v3.2.5","v3.0.20","v3.2.4","v3.0.19","v3.2.3","v3.2.2","v3.0.18","v3.0.17","v3.2.1","v3.0.16","v3.2-rc4","v3.2-rc7","v3.0.15","v3.2-rc6","v3.2-rc5","v3.0.14","v3.0.13","v3.2-rc3","v3.1","v3.2-rc2","v3.0.12","v3.2-rc1","v3.0.11","v3.0.10","v3.0.9","v3.0.8","v3.1-rc1","v3.1-rc9","v3.1-rc8","v3.0.7","v3.1-rc10","v3.1-rc7","v3.0.6","v3.1-rc3","v3.1-rc2","v3.0.5","v3.0.4","v3.1-rc4","v3.1-rc5","v3.0","v3.1-rc6","v3.0.3","v3.0.2","v3.0.1","v3.0-rc7","v3.0-rc4","v3.0-rc6","v3.0-rc5","v3.0-rc3","v3.0-rc1","v2.6.39","v3.0-rc2","v2.6.38","v2.6.39-rc2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