{"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":"2026-07-08T08:13:39.448950213Z","published":"2026-05-27T12:17:37.165Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45919.json","cna_assigner":"Linux"},"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":"0"},{"last_affected":"cb1831a83e54cd3269a2420fce81c4fd8ae6f667"},{"last_affected":"1c37ff78298a6b6063649123356a312e1cce12ca"},{"last_affected":"f17c786b28a3060a566a170c2cf3bd7441fc30a3"}]},{"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"}]}],"versions":["v4.14","v4.14.2","v4.9.65","v4.4.102","v4.14-rc1","v4.4.101","v4.14.1","v4.9.64","v4.4.100","v4.14-rc7","v4.9.63","v4.4.99","v4.9.62","v4.4.98","v4.4.97","v4.9.61","v4.14-rc3","v4.13","v4.14-rc8","v4.9.60","v4.4.96","v4.14-rc4","v4.14-rc6","v4.9.59","v4.4.95","v4.14-rc2","v4.14-rc5","v4.9.58","v4.4.94","v4.9.57","v4.4.93","v4.9.56","v4.4.92","v4.9.55","v4.9.54","v4.4.91","v4.9.53","v4.4.90","v4.9.52","v4.4.89","v4.9.51","v4.4.88","v4.13-rc2","v4.9.50","v4.9.49","v4.4.87","v4.9.48","v4.13-rc1","v4.13-rc3","v4.9.47","v4.4.86","v4.13-rc7","v4.9.46","v4.4.85","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.9.45","v4.4.84","v4.9.44","v4.4.83","v4.9.43","v4.4.82","v4.9.42","v4.4.81","v4.4.80","v4.9.41","v4.4.79","v4.9.40","v4.12-rc1","v4.9.39","v4.4.78","v4.12","v4.4.77","v4.9.38","v4.9.37","v4.4.76","v4.12-rc5","v4.9.36","v4.12-rc7","v4.9.35","v4.4.75","v4.12-rc6","v4.12-rc4","v4.9.34","v4.4.74","v4.12-rc2","v4.4.73","v4.9.33","v4.12-rc3","v4.9.32","v4.4.72","v4.11","v4.9.31","v4.4.71","v4.9.30","v4.4.70","v4.9.29","v4.4.69","v4.9.28","v4.4.68","v4.9.27","v4.4.67","v4.11-rc1","v4.9.26","v4.4.66","v4.11-rc6","v4.9.25","v4.4.65","v4.11-rc8","v4.4.64","v4.9.24","v4.4.63","v4.11-rc7","v4.11-rc3","v4.9.23","v4.4.62","v4.11-rc5","v4.11-rc2","v4.4.61","v4.9.22","v4.11-rc4","v4.9.21","v4.4.60","v4.4.59","v4.9.20","v4.9.19","v4.4.58","v4.9.18","v4.4.57","v4.10","v4.9.17","v4.4.56","v4.9.16","v4.4.55","v4.9.15","v4.4.54","v4.9.14","v4.4.53","v4.9.13","v4.4.52","v4.9","v4.9.12","v4.4.51","v4.9.11","v4.4.50","v4.10-rc8","v4.10-rc3","v4.10-rc1","v4.10-rc7","v4.4.49","v4.9.10","v4.10-rc6","v4.10-rc2","v4.9.9","v4.4.48","v4.10-rc5","v4.9.8","v4.4.47","v4.9.7","v4.4.46","v4.9.6","v4.4.45","v4.10-rc4","v4.9.5","v4.4.44","v4.9.4","v4.4.43","v4.9.3","v4.4.42","v4.9.2","v4.4.41","v4.9.1","v4.4.40","v4.4.39","v4.9-rc7","v4.9-rc6","v4.9-rc8","v4.4.38","v4.9-rc1","v4.4.37","v4.9-rc5","v4.4.36","v4.9-rc3","v4.4.35","v4.9-rc4","v4.4.34","v4.9-rc2","v4.4.33","v4.4.32","v4.4.31","v4.4.30","v4.8","v4.4.29","v4.4.28","v4.4.27","v4.4.26","v4.4.25","v4.4.24","v4.4.23","v4.8-rc8","v4.8-rc2","v4.8-rc1","v4.8-rc7","v4.4.22","v4.8-rc6","v4.8-rc5","v4.4.21","v4.8-rc4","v4.4.20","v4.8-rc3","v4.7","v4.4.19","v4.4.18","v4.4.17","v4.4.16","v4.7-rc4","v4.7-rc2","v4.4.15","v4.7-rc1","v4.7-rc7","v4.7-rc6","v4.7-rc3","v4.4.14","v4.7-rc5","v4.4.13","v4.6","v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