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vuln-cve/data/2026/45xxx/CVE-2026-45919.json
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{
"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": "2026-11-06T15:53:12.903Z"
},
"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"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-45919",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-11-06T15:44:31.654477Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-11-06T15:53:12.903Z"
}
}
]
}
}
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