{
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    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-50032",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix rcuog wake-up from offline softirq\n\nAfter a CPU has set itself offline and before it eventually calls\nrcutree_report_cpu_dead(), there are still opportunities for callbacks\nto be enqueued, for example from a softirq. When that happens on NOCB,\nthe rcuog wake-up is deferred through an IPI to an online CPU in order\nnot to call into the scheduler and risk arming the RT-bandwidth after\nhrtimers have been migrated out and disabled.\n\nBut performing a synchronized IPI from a softirq is buggy as reported in\nthe following scenario:\n\n        WARNING: CPU: 1 PID: 26 at kernel/smp.c:633 smp_call_function_single\n        Modules linked in: rcutorture torture\n        CPU: 1 UID: 0 PID: 26 Comm: migration/1 Not tainted 6.11.0-rc1-00012-g9139f93209d1 #1\n        Stopper: multi_cpu_stop+0x0/0x320 <- __stop_cpus+0xd0/0x120\n        RIP: 0010:smp_call_function_single\n        <IRQ>\n        swake_up_one_online\n        __call_rcu_nocb_wake\n        __call_rcu_common\n        ? rcu_torture_one_read\n        call_timer_fn\n        __run_timers\n        run_timer_softirq\n        handle_softirqs\n        irq_exit_rcu\n        ? tick_handle_periodic\n        sysvec_apic_timer_interrupt\n        </IRQ>\n\nFix this with forcing deferred rcuog wake up through the NOCB timer when\nthe CPU is offline. The actual wake up will happen from\nrcutree_report_cpu_dead()."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
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                                            "version_name": "9b52ee18f6d2",
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                                            "version_affected": "<",
                                            "version_name": "00a611229bfa",
                                            "version_value": "e66b1e01f2eb"
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                                        {
                                            "version_affected": "<",
                                            "version_name": "9139f93209d1",
                                            "version_value": "f7345ccc62a4"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.12-rc1",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.12-rc1",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6.57",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.11.4",
                                                        "lessThanOrEqual": "6.11.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.12-rc3",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
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    "references": {
        "reference_data": [
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                "url": "https://git.kernel.org/stable/c/84a5feebba10354c683983f5f1372a144225e4c2",
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                "name": "https://git.kernel.org/stable/c/e66b1e01f2eb3209d08122572f41f7838b79540d"
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