{"id":"CVE-2026-45919","summary":"sched/rt: Skip currently executing CPU in rto_next_cpu()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched/rt: Skip currently executing CPU in rto_next_cpu()\n\nCPU0 becomes overloaded when hosting a CPU-bound RT task, a non-CPU-bound\nRT task, and a CFS task stuck in kernel space. When other CPUs switch from\nRT to non-RT tasks, RT load balancing (LB) is triggered; with\nHAVE_RT_PUSH_IPI enabled, they send IPIs to CPU0 to drive the execution\nof rto_push_irq_work_func. During push_rt_task on CPU0,\nif next_task-\u003eprio \u003c rq-\u003edonor-\u003eprio, resched_curr() sets NEED_RESCHED\nand after the push operation completes, CPU0 calls rto_next_cpu().\nSince only CPU0 is overloaded in this scenario, rto_next_cpu() should\nideally return -1 (no further IPI needed).\n\nHowever, multiple CPUs invoking tell_cpu_to_push() during LB increments\nrd-\u003erto_loop_next. Even when rd-\u003erto_cpu is set to -1, the mismatch between\nrd-\u003erto_loop and rd-\u003erto_loop_next forces rto_next_cpu() to restart its\nsearch from -1. With CPU0 remaining overloaded (satisfying rt_nr_migratory\n&& rt_nr_total \u003e 1), it gets reselected, causing CPU0 to queue irq_work to\nitself and send self-IPIs repeatedly. As long as CPU0 stays overloaded and\nother CPUs run pull_rt_tasks(), it falls into an infinite self-IPI loop,\nwhich triggers a CPU hardlockup due to continuous self-interrupts.\n\nThe trigging scenario is as follows:\n\n         cpu0                      cpu1                    cpu2\n                                pull_rt_task\n                              tell_cpu_to_push\n                 \u003c------------irq_work_queue_on\nrto_push_irq_work_func\n       push_rt_task\n    resched_curr(rq)                                   pull_rt_task\n    rto_next_cpu                                     tell_cpu_to_push\n                      \u003c-------------------------- atomic_inc(rto_loop_next)\nrd-\u003erto_loop != next\n     rto_next_cpu\n   irq_work_queue_on\nrto_push_irq_work_func\n\nFix redundant self-IPI by filtering the initiating CPU in rto_next_cpu().\nThis solution has been verified to effectively eliminate spurious self-IPIs\nand prevent CPU hardlockup scenarios.","modified":"2026-10-28T02:31:11.597032979Z","published":"2026-05-27T12:17:37.165Z","related":["ALSA-2026:77689","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3130-1","SUSE-SU-2026:3166-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45919.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/16ca9f3117e9a294646c897daf08a5ab546c711b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3b3c672a66db3de3b40f8a7057864bc1f874ede3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52aeb1e07ec223caf212f036817976c98d2aa250"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8ad5577b2d4acfd83f03d97a0aece2d18aac5f07"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94894c9c477e53bcea052e075c53f89df3d2a33e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9f25edc5a20cb52a5abbf25f0724bb4732b81801"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a6a73403733e86748421f2eeaf028c85683ef896"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d57d0746276a88ea43a2cc62b849fd8a95e32e41"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45919.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45919"},{"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":"4bdced5c9a2922521e325896a7bbbf0132c94e56"},{"fixed":"d57d0746276a88ea43a2cc62b849fd8a95e32e41"},{"fixed":"3b3c672a66db3de3b40f8a7057864bc1f874ede3"},{"fixed":"16ca9f3117e9a294646c897daf08a5ab546c711b"},{"fixed":"8ad5577b2d4acfd83f03d97a0aece2d18aac5f07"},{"fixed":"a6a73403733e86748421f2eeaf028c85683ef896"},{"fixed":"52aeb1e07ec223caf212f036817976c98d2aa250"},{"fixed":"9f25edc5a20cb52a5abbf25f0724bb4732b81801"},{"fixed":"94894c9c477e53bcea052e075c53f89df3d2a33e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.103"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.66"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.3"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cb1831a83e54cd3269a2420fce81c4fd8ae6f667"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1c37ff78298a6b6063649123356a312e1cce12ca"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f17c786b28a3060a566a170c2cf3bd7441fc30a3"}]}],"versions":["v4.4.302","v4.4.301","v4.4.300","v4.4.299","v4.4.298","v4.4.297","v4.4.296","v4.4.295","v4.4.294","v4.4.293","v4.4.292","v4.4.291","v4.4.290","v4.4.289","v4.4.288","v4.4.287","v4.4.286","v4.4.285","v4.4.284","v4.4.283","v4.4.282","v4.4.281","v4.4.280","v4.4.279","v4.4.278","v4.4.277","v4.4.276","v4.4.275","v4.4.274","v4.4.273","v4.4.272","v4.4.271","v4.4.270","v4.4.269","v4.4.268","v4.4.267","v4.4.266","v4.4.265","v4.4.264","v4.4.263","v4.4.262","v4.4.261","v4.4.260","v4.4.259","v4.4.258","v4.4.257","v4.4.256","v4.4.255","v4.4.254","v4.4.253","v4.4.252","v4.4.251","v4.4.250","v4.4.249","v4.4.248","v4.4.247","v4.4.246","v4.4.245","v4.4.244","v4.4.243","v4.4.242","v4.4.241","v4.4.240","v4.4.239","v4.4.238","v4.4.237","v4.4.236","v4.4.235","v4.4.234","v4.4.233","v4.4.232","v4.4.231","v4.4.230","v4.4.229","v4.4.228","v4.4.227","v4.4.226","v4.4.225","v4.4.224","v4.4.223","v4.4.222","v4.4.221","v4.4.220","v4.4.219","v4.4.218","v4.4.217","v4.4.216","v4.4.215","v4.4.214","v4.4.213","v4.4.212","v4.4.211","v4.4.210","v4.4.209","v4.4.208","v4.4.207","v4.4.206","v4.4.205","v4.4.204","v4.4.203","v4.4.202","v4.4.201","v4.4.200","v4.4.199","v4.4.198","v4.4.197","v4.4.196","v4.4.195","v4.4.194","v4.4.193","v4.4.192","v4.4.191","v4.4.190","v4.4.189","v4.4.188","v4.4.187","v4.4.186","v4.4.185","v4.4.184","v4.4.183","v4.4.182","v4.4.181","v4.4.180","v4.4.179","v4.4.178","v4.4.177","v4.4.176","v4.4.175","v4.4.174","v4.4.173","v4.4.172","v4.4.171","v4.4.170","v4.4.169","v4.4.168","v4.4.167","v4.4.166","v4.4.165","v4.4.164","v4.4.163","v4.4.162","v4.4.161","v4.4.160","v4.4.159","v4.4.158","v4.4.157","v4.4.156","v4.4.155","v4.4.154","v4.4.153","v4.4.152","v4.4.151","v4.4.150","v4.4.149","v4.4.148","v4.4.147","v4.4.146","v4.4.145","v4.4.144","v4.4.143","v4.4.142","v4.4.141","v4.4.140","v4.4.139","v4.4.138","v4.4.137","v4.4.136","v4.4.135","v4.4.134","v4.4.133","v4.4.132","v4.4.131","v4.4.130","v4.4.129","v4.4.128","v4.4.127","v4.4.126","v4.4.125","v4.4.124","v4.4.123","v4.4.122","v4.4.121","v4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