{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-45919", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-45919", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-05-27T12:17:37.165Z", "updatedAt": "2026-05-27T12:17:37.165Z", "importedAt": "2026-10-24T01:58:14.884Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "sched/rt: Skip currently executing CPU in rto_next_cpu()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "d57d0746276a88ea43a2cc62b849fd8a95e32e41" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "3b3c672a66db3de3b40f8a7057864bc1f874ede3" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "16ca9f3117e9a294646c897daf08a5ab546c711b" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "8ad5577b2d4acfd83f03d97a0aece2d18aac5f07" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "a6a73403733e86748421f2eeaf028c85683ef896" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "52aeb1e07ec223caf212f036817976c98d2aa250" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "9f25edc5a20cb52a5abbf25f0724bb4732b81801" }, { "version": "4bdced5c9a2922521e325896a7bbbf0132c94e56", "status": "affected", "versionType": "git", "lessThan": "94894c9c477e53bcea052e075c53f89df3d2a33e" }, { "version": "cb1831a83e54cd3269a2420fce81c4fd8ae6f667", "status": "affected", "versionType": "git" }, { "version": "1c37ff78298a6b6063649123356a312e1cce12ca", "status": "affected", "versionType": "git" }, { "version": "f17c786b28a3060a566a170c2cf3bd7441fc30a3", "status": "affected", "versionType": "git" }, { "version": "4.4.103", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.9.66", "status": "affected", "versionType": "semver", "lessThan": "4.10" }, { "version": "4.14.3", "status": "affected", "versionType": "semver", "lessThan": "4.15" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.15" }, { "version": "5.10.252", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.202", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.165", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.128", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.75", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }