{"id":"CVE-2026-90053","summary":"net/sched: sch_htb: limit htb_classify inner-class filter hops","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_htb: limit htb_classify inner-class filter hops\n\nhtb_classify() follows each filter-selected inner class by switching\nto cl-\u003efilter_list, but never bounds the number of hops. A filter on\nan inner class can point back to itself or to another inner class that\npoints back, creating an infinite loop in the packet classification\npath with the qdisc lock held and BH disabled — a soft lockup / panic\nfrom a single packet.\n\nBound the traversal with a hop counter and drop the packet with a\nrate-limited warning once the bound is exceeded. The counter is\nincremented at the point the inner filter chain is picked up, after the\nTC_ACT_* switch has consumed the classifier verdict, so a terminal\nTC_ACT_QUEUED/STOLEN/TRAP on the last permitted chain still sets *qerr\nto __NET_XMIT_STOLEN and the packet is not charged as a drop by this\nqdisc or its parent.\n\nThe bound is TC_HTB_MAXDEPTH, taken from HTB's own parameters rather than\nfrom the qdisc hierarchy depth limit. Class levels run from 0 to\nTC_HTB_MAXDEPTH - 1, so a traversal that strictly descends in level can\ntake at most TC_HTB_MAXDEPTH hops. That descent is what a sane\nconfiguration does, but it is assumed here rather than enforced:\nhtb_find() resolves a classid against every class in the qdisc, so a\nfilter may equally select a sibling or an ancestor. The normal\nroot -\u003e inner -\u003e leaf path takes a single hop, so the bound does not\naffect legitimate classification.\n\nhtb_classify() can now return NULL irrespective of CONFIG_NET_CLS_ACT,\nwhereas previously every NULL return sat inside that ifdef. The NULL\nhandler in htb_enqueue() therefore cannot stay conditional either, so\ndrop the ifdef around it. This matches hfsc_enqueue(), which has always\nhandled a NULL class unconditionally. Without it, a kernel built\nwithout actions would dereference a NULL class instead of dropping.\n\nConditions to recreate the bug:\n- CONFIG_NET_SCHED, CONFIG_NET_SCH_HTB, CONFIG_NET_CLS_U32,\n  CONFIG_LOCKUP_DETECTOR.\n- Create an HTB qdisc on a device (e.g. lo), add an inner class\n  1:1 with a leaf child 1:10, install a root u32 filter selecting\n  1:1, and an inner-class u32 filter on 1:1 also selecting 1:1.\n- Send one packet (ping). On the unfixed kernel the classify loop\n  spins with the qdisc lock held; with softlockup_panic=1 it panics.\n- Reachable from unprivileged user via unshare -Urn (CAP_NET_ADMIN).","modified":"2026-09-19T03:47:24.157628819Z","published":"2026-09-17T16:05:38.957Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90053.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/010d05df52cec053bdc67d82c5b61cc4996f3fde"},{"type":"WEB","url":"https://git.kernel.org/stable/c/729c4896ab829169f95915d65edd530325910b37"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83bb11805b620c498d6417e0e409f26887981489"},{"type":"WEB","url":"https://git.kernel.org/stable/c/872317e84fd019ceffba125e62d31586e3336d41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8c9611f7ba3ea5594e41bac952363aa0966d3280"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90a149ab1f8344b7f713e9a838f69fde9e8d2a51"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e54be9aa503a0297b63aec530fbf760350effd45"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90053.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90053"},{"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":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"83bb11805b620c498d6417e0e409f26887981489"},{"fixed":"90a149ab1f8344b7f713e9a838f69fde9e8d2a51"},{"fixed":"010d05df52cec053bdc67d82c5b61cc4996f3fde"},{"fixed":"8c9611f7ba3ea5594e41bac952363aa0966d3280"},{"fixed":"e54be9aa503a0297b63aec530fbf760350effd45"},{"fixed":"872317e84fd019ceffba125e62d31586e3336d41"},{"fixed":"729c4896ab829169f95915d65edd530325910b37"}]}],"versions":["v7.2.5","v6.18.51","v6.12.109","v6.6.156","v6.1.187","v5.15.220","v7.2.4","v6.18.50","v7.2.3","v6.18.49","v6.12.108","v7.2.2","v6.18.48","v6.12.107","v6.6.155","v6.1.186","v5.15.219","v7.2","v7.2.1","v6.18.47","v6.12.106","v6.6.154","v6.1.185","v5.15.218","v6.18.46","v6.12.105","v6.6.153","v6.1.184","v5.15.217","v6.18.45","v6.12.104","v6.6.152","v6.1.183","v5.15.216","v7.2-rc1","v7.2-rc5","v6.18.44","v6.12.103","v6.6.151","v7.2-rc7","v6.1.182","v5.15.215","v7.2-rc2","v7.2-rc6","v7.2-rc3","v6.18.43","v6.12.102","v6.6.150","v6.6.149","v6.1.181","v5.15.214","v6.12.101","v6.18.42","v6.6.148","v6.1.180","v5.15.213","v7.2-rc4","v6.18.41","v6.12.100","v6.6.147","v6.18.40","v6.12.99","v6.6.146","v6.1.179","v5.15.212","v6.12.98","v6.6.145","v6.1.178","v6.12.97","v6.18.39","v6.12.96","v6.6.144","v6.1.177","v5.15.211","v6.18.38","v6.12.95","v6.18.37","v6.12.94","v6.6.143","v6.1.176","v5.15.210","v6.18.36","v7.1","v7.1-rc1","v6.18.35","v6.12.93","v6.6.142","v6.1.175","v5.15.209","v7.1-rc7","v7.1-rc6","v7.1-rc4","v7.1-rc3","v6.18.34","v6.12.92","v7.1-rc2","v7.1-rc5","v6.18.33","v6.12.91","v6.6.141","v6.1.174","v5.15.208","v6.1.173","v5.15.207","v6.18.32","v6.12.90","v6.6.140","v7.0","v6.18.31","v6.12.89","v6.6.139","v6.18.30","v6.12.88","v6.6.138","v6.1.172","v5.15.206","v6.18.29","v6.12.87","v6.18.28","v6.1.171","v5.15.205","v6.1.170","v5.15.204","v6.18.27","v6.12.86","v6.6.137","v6.18.26","v6.12.85","v7.0-rc1","v5.15.203","v6.1.169","v6.6.136","v6.12.84","v6.18.25","v6.18.24","v6.12.83","v6.6.135","v6.18.23","v6.12.82","v6.18.22","v6.12.81","v6.6.134","v6.1.168","v5.15.202","v7.0-rc5","v7.0-rc6","v6.18.21","v6.12.80","v6.6.133","v6.1.167","v7.0-rc7","v7.0-rc3","v7.0-rc4","v6.6.132","v6.19-rc2","v6.6.131","v6.18.20","v6.12.79","v6.6.130","v7.0-rc2","v6.19","v6.12.78","v6.18.19","v6.12.77","v6.6.129","v6.1.166","v6.18.18","v6.18.17","v6.12.76","v6.18.16","v6.1.165","v6.6.128","v6.12.75","v6.18.15","v6.6.127","v6.12.74","v5.15.201","v6.1.164","v6.18.14","v6.18.13","v6.18.12","v6.12.73","v6.6.126","v6.1.163","v5.15.200","v6.18.11","v6.12.72","v6.6.125","v6.18.10","v6.12.71","v6.6.124","v6.12.70","v6.18.9","v6.12.69","v6.6.123","v6.1.162","v5.15.199","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.18.8","v6.12.68","v6.6.122","v6.1.161","v5.15.198","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.18.7","v6.12.67","v6.6.121","v6.19-rc3","v6.18.6","v6.12.66","v5.15.197","v6.1.160","v6.18.5","v6.12.65","v6.6.120","v6.18.4","v6.12.64","v6.6.119","v6.1.159","v6.18.3","v6.12.63","v6.18.2","v6.18.1","v6.12.62","v6.18","v6.12.61","v6.18-rc1","v6.12.60","v6.6.118","v6.1.158","v5.15.196","v6.18-rc7","v6.18-rc3","v6.12.59","v6.6.117","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.12.58","v6.6.116","v6.18-rc4","v6.12.57","v6.12.56","v6.6.115","v6.12.55","v6.6.114","v6.1.157","v5.15.195","v6.12.54","v6.6.113","v6.12.53","v6.6.112","v6.1.156","v5.15.194","v6.12.52","v6.6.111","v6.1.155","v6.12.51","v6.6.110","v6.17","v6.17-rc7","v6.12.50","v6.6.109","v6.17-rc1","v6.17-rc2","v6.12.49","v6.6.108","v6.1.154","v5.15.193","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.6.107","v6.1.153","v6.12.47","v6.6.106","v6.1.152","v6.12.46","v6.6.105","v6.1.151","v5.15.192","v6.12.45","v6.6.104","v6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