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CVE-2026-64250

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, eef4f71b46a9929ac33e968538c9dd5d96a02460, <6.12.95, <6.18.38, 0, 91840be8f710370607f949a627e070896faeddb8, 2dc79362302922cb18f35e262712b5e58de65442, <=7.1.*, <7.1, 6.12.92, 6.1.178, 6.6.142, <=6.6.*, 6.12.95, 6.1.175, <1fa22de588a65880d6fe54c38c87fffe7d519f60, <6.1.178, 6.18.34, <a0269e928728f970c782319fee53d92d4ea4e512, 7.1, 7.0.11, 18c0456ea2615b1a743a6db739c74411c3b42bc6, <=6.18.*, 6.6.145, 684a78183c54c23e70d1cba320f7fc184604210b, 6.18.38, <262dadc619e69ebeb97affd334cd1078a9704e98, <6.6.145, <0833b2b84c2fc1387f8165f0cbf6a02d67f647a5, <=*, <90e254f18b8c224460082329dd5c42fd30995c2f, 7.1.3, <f2539c56c74691e7a88af6372ba2b48c06ed2fe4, 7.2, 81b582784518196eff1050212a046bc29d3a05dd

Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Report dying CPU to RCU in stop_this_cpu() This is a port of MIPS commit 9f3f3bdc6d9dac1 ("MIPS: smp: report dying CPU to RCU in stop_this_cpu()"). smp_send_stop() parks all secondary CPUs in stop_this_cpu(). And the function marks the CPU offline for the scheduler via set_cpu_online(false) but never informs RCU, so RCU keeps expecting a quiescent state from CPUs that are now spinning forever with interrupts disabled. As long as nothing waits for an RCU grace period after smp_send_stop() this is harmless, which is why it went unnoticed. However, since commit 91840be8f710370 ("irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT"), irq_work_sync() calls synchronize_rcu() on architectures without an irq_work self-IPI, i.e. where arch_irq_work_has_interrupt() returns false. Any irq_work_sync() issued in the reboot/shutdown/halt path after smp_send_stop() then blocks on a grace period that can never complete, hanging the reboot: WARNING: CPU: 0 PID: 15 at kernel/irq_work.c:144 irq_work_queue_on ... rcu: INFO: rcu_sched detected stalls on CPUs/tasks: rcu: Offline CPU 1 blocking current GP. rcu: Offline CPU 2 blocking current GP. rcu: Offline CPU 3 blocking current GP. This issue needs some hacks to reproduce, and it was not noticed on LoongArch because arch_irq_work_has_interrupt() usually returns true. Call rcutree_report_cpu_dead() once interrupts are disabled, mirroring the generic CPU-hotplug offline path, so RCU stops waiting on the parked CPUs and grace periods can still complete. LoongArch shuts down all CPUs here without going through the CPU-hotplug mechanism, so this report is not otherwise issued.

Gravité et risque d'exploitation

CVE-2026-64250 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 4.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, eef4f71b46a9929ac33e968538c9dd5d96a02460, <6.12.95, <6.18.38, 0, 91840be8f710370607f949a627e070896faeddb8, 2dc79362302922cb18f35e262712b5e58de65442, <=7.1.*, <7.1, 6.12.92, 6.1.178, 6.6.142, <=6.6.*, 6.12.95, 6.1.175, <1fa22de588a65880d6fe54c38c87fffe7d519f60, <6.1.178, 6.18.34, <a0269e928728f970c782319fee53d92d4ea4e512, 7.1, 7.0.11, 18c0456ea2615b1a743a6db739c74411c3b42bc6, <=6.18.*, 6.6.145, 684a78183c54c23e70d1cba320f7fc184604210b, 6.18.38, <262dadc619e69ebeb97affd334cd1078a9704e98, <6.6.145, <0833b2b84c2fc1387f8165f0cbf6a02d67f647a5, <=*, <90e254f18b8c224460082329dd5c42fd30995c2f, 7.1.3, <f2539c56c74691e7a88af6372ba2b48c06ed2fe4, 7.2, 81b582784518196eff1050212a046bc29d3a05dd) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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