{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"d57d0746276a88ea43a2cc62b849fd8a95e32e41","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"3b3c672a66db3de3b40f8a7057864bc1f874ede3","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"16ca9f3117e9a294646c897daf08a5ab546c711b","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"8ad5577b2d4acfd83f03d97a0aece2d18aac5f07","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"a6a73403733e86748421f2eeaf028c85683ef896","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"52aeb1e07ec223caf212f036817976c98d2aa250","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"9f25edc5a20cb52a5abbf25f0724bb4732b81801","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"lessThan":"94894c9c477e53bcea052e075c53f89df3d2a33e","status":"affected","version":"4bdced5c9a2922521e325896a7bbbf0132c94e56","versionType":"git"},{"status":"affected","version":"cb1831a83e54cd3269a2420fce81c4fd8ae6f667","versionType":"git"},{"status":"affected","version":"1c37ff78298a6b6063649123356a312e1cce12ca","versionType":"git"},{"status":"affected","version":"f17c786b28a3060a566a170c2cf3bd7441fc30a3","versionType":"git"},{"lessThan":"4.5","status":"affected","version":"4.4.103","versionType":"semver"},{"lessThan":"4.10","status":"affected","version":"4.9.66","versionType":"semver"},{"lessThan":"4.15","status":"affected","version":"4.14.3","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.252","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.202","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.165","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.128","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.75","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.14","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cveId":"CVE-2026-45919","cwes":[],"description":"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->prio < rq->donor->prio, 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->rto_loop_next. Even when rd->rto_cpu is set to -1, the mismatch between\nrd->rto_loop and rd->rto_loop_next forces rto_next_cpu() to restart its\nsearch from -1. With CPU0 remaining overloaded (satisfying rt_nr_migratory\n&& rt_nr_total > 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                 <------------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                      <-------------------------- atomic_inc(rto_loop_next)\nrd->rto_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.","epss":{"date":"2026-11-06","percentile":0.02693,"score":0.0013},"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793980392903,"publishedAt":1779884257165,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/d57d0746276a88ea43a2cc62b849fd8a95e32e41"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/3b3c672a66db3de3b40f8a7057864bc1f874ede3"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/16ca9f3117e9a294646c897daf08a5ab546c711b"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/8ad5577b2d4acfd83f03d97a0aece2d18aac5f07"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/a6a73403733e86748421f2eeaf028c85683ef896"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/52aeb1e07ec223caf212f036817976c98d2aa250"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/9f25edc5a20cb52a5abbf25f0724bb4732b81801"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/94894c9c477e53bcea052e075c53f89df3d2a33e"}],"remediation":[],"revision":"162f2b354bbf0e91b5176d6364473bec1ee77902fbb39df1e732c1eddda50b8b","sources":[{"modifiedAt":1793980392903,"name":"CNA: Linux","retrievedAt":1793981775467,"url":"https://www.cve.org/CVERecord?id=CVE-2026-45919"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793981786264,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-45919"}],"ssvc":{"assessedAt":1793979871654,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"sched/rt: Skip currently executing CPU in rto_next_cpu()","updatedAt":1793981786264}