{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-64374-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-09-09T16:39:36Z", "generator": { "date": "2026-09-09T16:39:36Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-64374-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-07-25T10:17:00Z", "revision_history": [ { "date": "2026-07-25T10:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-09-09T13:21:33Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-09-09T16:39:36Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2026-64374" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Debian 10", "product": { "name": "Debian 10", "product_id": "Debian-10", "product_identification_helper": { "cpe": "cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Debian" }, { "branches": [ { "category": "product_version", "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "product": { "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "product_id": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "product_identification_helper": { "purl": "pkg:deb/debian/linux-headers-4.19.0-28-all-amd64@4.19.325-1?arch=amd64" } } }, { "category": "product_version", "name": "linux-libc-dev-0:4.19.325-1.amd64", "product": { "name": "linux-libc-dev-0:4.19.325-1.amd64", "product_id": "linux-libc-dev-0:4.19.325-1.amd64", 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as a component of Debian 10", "product_id": "Debian-10:linux-cpupower-0:4.19.325-1.amd64" }, "product_reference": "linux-cpupower-0:4.19.325-1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-cpupower-0:4.19.325-2.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-cpupower-0:4.19.325-2.amd64" }, "product_reference": "linux-cpupower-0:4.19.325-2.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64" }, "product_reference": "linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-64374", "cwe": { "id": "CWE-667", "name": "Improper Locking" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/rt: Have RT_PUSH_IPI be default off for non PREEMPT_RT\n\nRT migration is done aggressively. When a CPU schedules out a high\npriority RT task for a lower priority task, it will look to see if there's\nany RT tasks that are waiting to run on another CPU that is of higher\npriority than the task this CPU is about to run. If it finds one, it will\npull that task over to the CPU and allow it to run there instead.\n\nNormally, this pulling is done by looking at the RT overloaded mask (rto)\nwhich contains all the CPUs in the scheduler domain with RT tasks that are\nwaiting to run due to a higher priority RT task currently running on their\nCPU. The CPU that is about to schedule a lower priority task will grab the\nrq lock of the overloaded CPU and move the RT task from that CPU's runqueue\nto the local one and schedule the higher priority RT task.\n\nThis caused issues when a lot of CPUs would schedule a lower priority task\nat the same time. They would all try to grab the same runqueue lock of\nthe CPU with the overloaded RT tasks. Only the first CPU that got in will\nget that task. All the others would wait until they got the runqueue lock\nand see there's nothing to pull and do nothing. On systems with lots of\nCPUs, this caused a large latency (up to 500us) which is beyond what\nPREEMPT_RT is to allow.\n\nThe solution to that was to create an RT_PUSH_IPI logic. When any CPU\nwanted to pull a task, instead of grabbing the runqueue lock of the\noverloaded CPU, it would start by sending an IPI to the overloaded CPU,\nand that IPI handler would have the CPU with the waiting RT task do a push\ninstead. Then that handler would send an IPI to the next CPU with\noverloaded RT tasks, and so on. Note, after the first CPU starts this\nprocess, if another CPU wanted to do a pull, it would see that the process\nhas already begun and would only increment a counter to have the IPIs\ncontinue again.\n\nThe RT_PUSH_IPI solved the latency problem with PREEMPT_RT but could cause\na new issue with non PREEMPT_RT. Namely, softirqs run in a threaded\ncontext on PREEMPT_RT but they can run in an interrupt context in non-RT.\n\nIf an IPI lands on a CPU that has just woken up multiple RT tasks and the\ncurrent CPU is running a non RT or a low priority RT task, instead of\ndoing a push, it would simply do a schedule on that CPU. But if a softirq\nwas also executing on this CPU, the schedule would need to wait until the\nsoftirq finished. Until then, the CPU would still be considered overloaded\nas there are RT tasks still waiting to run on it.\n\nA live lock occurred on a workload that was doing heavy networking traffic\non a large machine where the softirqs would run 500us out of 750us. And it\nwould also be waking up RT tasks, causing the RT pull logic to be\nconstantly executed.\n\nWhen a softirq triggered on a CPU with RT tasks queued but not running\nyet, and the other CPUs would see this CPU as being overloaded, they would\nsend an IPI over to it. The CPU would notice that the waiting RT tasks are\nof higher priority than the currently running task and simply schedule\nthat CPU instead. But because the softirq was executing, before it could\nschedule, it would receive another IPI to do the same. The amount of IPIs\nwould slow down the currently running softirq so much that before it could\nreturn back to task context, it would execute another softirq never\nallowing the CPU to schedule. This live locked that CPU.\n\nAs RT_PUSH_IPI was created to help PREEMPT_RT, make it default off if\nPREEMPT_RT is not enabled.", "title": "Vulnerability description" } ], "product_status": { "known_affected": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-2+tuxcare.els1.amd64", 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"Debian-10:linux-support-4.19.0-29-0:4.19.325-2.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-64374" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/44aae426dbfd51286f7eb601cfa14bc32164812a", "url": "https://git.kernel.org/stable/c/44aae426dbfd51286f7eb601cfa14bc32164812a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4bd0da48fbc1dbef6774175129107fbbdd353e26", "url": "https://git.kernel.org/stable/c/4bd0da48fbc1dbef6774175129107fbbdd353e26" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/860aaff72c8446fed5e576249e19952883a18885", "url": "https://git.kernel.org/stable/c/860aaff72c8446fed5e576249e19952883a18885" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/89237c8fc15d8016a194076e648ccb57d75e65ae", "url": "https://git.kernel.org/stable/c/89237c8fc15d8016a194076e648ccb57d75e65ae" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a18f80bf5359238c4f067d691b96af00286fdd89", "url": "https://git.kernel.org/stable/c/a18f80bf5359238c4f067d691b96af00286fdd89" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b99f04ae3d200d2f8844aa29145bd18eccbeecde", "url": "https://git.kernel.org/stable/c/b99f04ae3d200d2f8844aa29145bd18eccbeecde" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/d8312a56d9a162e3ec76476aa487e7d20bc602e9", "url": "https://git.kernel.org/stable/c/d8312a56d9a162e3ec76476aa487e7d20bc602e9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dd29c017aed628076e915fe4cdfb5392fd4c5cab", "url": "https://git.kernel.org/stable/c/dd29c017aed628076e915fe4cdfb5392fd4c5cab" } ], "release_date": "2026-07-25T10:17:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-09-09T14:21:10.965768Z", "details": "This is a local, availability-only flaw in the RT scheduler that arises only on SMP systems when RT_PUSH_IPI is enabled on a non‑PREEMPT_RT kernel and there are runnable real‑time (SCHED_FIFO/RR) threads under heavy softirq load; without RT threads, the affected path is not exercised. Triggering it generally requires local privileges to run RT‑class threads (e.g., CAP_SYS_NICE or configured RT rlimits) and provides no confidentiality or integrity impact. Given the niche configuration and dependence on high cross‑CPU IPI traffic—further constrained on virtual machines with limited vCPUs—the practical risk is low and this CVE can be safely deprioritized.", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:hyperv-daemons-0:4.19.325-2.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-2.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-2.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-2.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1.amd64", "Debian-10:libcpupower1-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-2.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-2.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-2.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1.amd64", "Debian-10:linux-cpupower-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-2.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-doc-4.19-0:4.19.325-1.all", "Debian-10:linux-doc-4.19-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-doc-4.19-0:4.19.325-2.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1.all", "Debian-10:linux-headers-4.19.0-29-all-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-29-all-0:4.19.325-2.amd64", "Debian-10:linux-headers-4.19.0-29-all-amd64-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-29-all-amd64-0:4.19.325-2.amd64", "Debian-10:linux-headers-4.19.0-29-amd64-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-29-amd64-0:4.19.325-2.amd64", "Debian-10:linux-headers-4.19.0-29-common-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-29-common-0:4.19.325-2.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64", "Debian-10:linux-image-4.19.0-29-amd64-unsigned-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-image-4.19.0-29-amd64-unsigned-0:4.19.325-2.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-2.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-2.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-2.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-2+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-2.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-source-4.19-0:4.19.325-1.all", "Debian-10:linux-source-4.19-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-source-4.19-0:4.19.325-2.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all", "Debian-10:linux-support-4.19.0-29-0:4.19.325-2+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-29-0:4.19.325-2.all" ] } ] } ] }