CVE-2024-50032

{"id": "CVE-2024-50032", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-10-21T20:15:16.417", "references": [{"url": "https://git.kernel.org/stable/c/84a5feebba10354c683983f5f1372a144225e4c2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e66b1e01f2eb3209d08122572f41f7838b79540d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f7345ccc62a4b880cf76458db5f320725f28e400", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "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()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rcu/nocb: Se ha corregido la activaci\u00f3n de rcuog desde un softirq sin conexi\u00f3n. Despu\u00e9s de que una CPU se haya desconectado y antes de que finalmente llame a rcutree_report_cpu_dead(), a\u00fan hay oportunidades para que se pongan en cola devoluciones de llamadas, por ejemplo, desde un softirq. Cuando eso sucede en NOCB, la activaci\u00f3n de rcuog se pospone a trav\u00e9s de una IPI a una CPU en l\u00ednea para no llamar al programador y correr el riesgo de armar el ancho de banda RT despu\u00e9s de que los temporizadores hr se hayan migrado y deshabilitado. Pero realizar una IPI sincronizada desde un softirq tiene errores, como se informa en el siguiente escenario: ADVERTENCIA: CPU: 1 PID: 26 en kernel/smp.c:633 smp_call_function_single M\u00f3dulos vinculados en: rcutorture torture CPU: 1 UID: 0 PID: 26 Comm: immigration/1 No contaminado 6.11.0-rc1-00012-g9139f93209d1 #1 Detenedor: multi_cpu_stop+0x0/0x320 &lt;- __stop_cpus+0xd0/0x120 RIP: 0010:smp_call_function_single swake_up_one_online __call_rcu_nocb_wake __call_rcu_common ? rcu_torture_one_read call_timer_fn __run_timers run_timer_softirq handle_softirqs irq_exit_rcu ? tick_handle_periodic sysvec_apic_timer_interrupt Solucione esto forzando la activaci\u00f3n diferida de rcuog a trav\u00e9s del temporizador NOCB cuando la CPU est\u00e9 fuera de l\u00ednea. La activaci\u00f3n real se realizar\u00e1 desde rcutree_report_cpu_dead()."}], "lastModified": "2024-10-25T15:34:22.353", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "28067F77-C1B2-4A04-BA6B-2C4955E8853E", "versionEndExcluding": "6.6.57", "versionStartIncluding": "6.6.54"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B88D322F-6F03-45A1-8C58-9E45EAB64B13", "versionEndExcluding": "6.11", "versionStartIncluding": "6.10.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "72A93F71-1302-40DD-847E-3C6D29220EAE", "versionEndExcluding": "6.11.4", "versionStartIncluding": "6.11.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1.113:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81EA2611-0623-46DE-8378-F900B6B1EC79"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}