{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-45919", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.085Z", "datePublished": "2026-05-27T12:17:37.165Z", "dateUpdated": "2026-05-27T12:17:37.165Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-27T12:17:37.165Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/rt.c" ], "versions": [ { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "d57d0746276a88ea43a2cc62b849fd8a95e32e41", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "3b3c672a66db3de3b40f8a7057864bc1f874ede3", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "16ca9f3117e9a294646c897daf08a5ab546c711b", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "8ad5577b2d4acfd83f03d97a0aece2d18aac5f07", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "a6a73403733e86748421f2eeaf028c85683ef896", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "52aeb1e07ec223caf212f036817976c98d2aa250", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "9f25edc5a20cb52a5abbf25f0724bb4732b81801", "status": "affected", "versionType": "git" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "lessThan": "94894c9c477e53bcea052e075c53f89df3d2a33e", "status": "affected", "versionType": "git" }, { "version": "cb1831a83e54cd3269a2420fce81c4fd8ae6f667", "status": "affected", "versionType": "git" }, { "version": "1c37ff78298a6b6063649123356a312e1cce12ca", "status": "affected", "versionType": "git" }, { "version": "f17c786b28a3060a566a170c2cf3bd7441fc30a3", "status": "affected", "versionType": "git" }, { "version": "4.4.103", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.9.66", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.3", "lessThan": "4.15", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/rt.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.252", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.202", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.252" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.202" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.19.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d57d0746276a88ea43a2cc62b849fd8a95e32e41" }, { "url": "https://git.kernel.org/stable/c/3b3c672a66db3de3b40f8a7057864bc1f874ede3" }, { "url": "https://git.kernel.org/stable/c/16ca9f3117e9a294646c897daf08a5ab546c711b" }, { "url": "https://git.kernel.org/stable/c/8ad5577b2d4acfd83f03d97a0aece2d18aac5f07" }, { "url": "https://git.kernel.org/stable/c/a6a73403733e86748421f2eeaf028c85683ef896" }, { "url": "https://git.kernel.org/stable/c/52aeb1e07ec223caf212f036817976c98d2aa250" }, { "url": "https://git.kernel.org/stable/c/9f25edc5a20cb52a5abbf25f0724bb4732b81801" }, { "url": "https://git.kernel.org/stable/c/94894c9c477e53bcea052e075c53f89df3d2a33e" } ], "title": "sched/rt: Skip currently executing CPU in rto_next_cpu()", "x_generator": { "engine": "bippy-1.2.0" } } } }