Heimdall Security Logo

CVE-2026-72409

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.5 · Élevée
EPSS 0.7%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, 7.2, <1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6, 0, <=7.1.*, <8c7a489aa71d2693752b2e794a68bf672d16c829, 4.4, 6.1.178, <fd398d6480987e4c84fff0aaab6b9d6642a93343, 12bb03b436dad56692e9a103ed26156156bef5d2, <=5.10.*, <=6.6.*, 6.12.97, <be626ac1faadd49c2cead9f9cd06ba8752d81563, <=6.18.*, <b84dd48f9da1eb132bdc06a944423cd5a1641ef1, <5bdb33ff6e58bdc43632e98b30723eb65352d671, <82c13027ed283b856017adee970dbfdffce5c6b8, 5.15.212, 6.6.145, 5.10.261, <=*, <=5.15.*, <bf88cd3b649bc3e638f1e8a77649581852747a68, <4.4

Description

In the Linux kernel, the following vulnerability has been resolved: net: mvneta: re-enable percpu interrupt on resume On Marvell MPIC platforms (Armada 370/XP/38x), mvneta uses a percpu IRQ disable/enable scheme for NAPI: the ISR (mvneta_percpu_isr) calls disable_percpu_irq() to mask the MPIC per-CPU interrupt and schedules NAPI poll, which calls enable_percpu_irq() on completion to unmask. If suspend occurs while NAPI poll is pending (between disable_percpu_irq in the ISR and enable_percpu_irq in poll completion), the interrupt is never re-enabled: 1. mvneta_percpu_isr: disable_percpu_irq() + napi_schedule() => MPIC masked, percpu_enabled cpumask bit cleared 2. NAPI poll does not complete before suspend proceeds (on PREEMPT_RT this is highly likely since softirqs run in ksoftirqd which gets frozen; on non-RT it can happen when softirq processing is deferred to ksoftirqd) 3. mvneta_stop_dev => napi_disable(): cancels the pending poll without executing the completion path 4. suspend_device_irqs => IRQCHIP_MASK_ON_SUSPEND: masks MPIC (already masked, but records IRQS_SUSPENDED) 5. Resume: mpic_resume checks irq_percpu_is_enabled() => false (bit was cleared in step 1) => skips unmask 6. mvneta_start_dev only restores device-level INTR_NEW_MASK, does not touch the MPIC per-CPU mask Result: MPIC per-CPU interrupt stays masked permanently. The NIC generates interrupts (INTR_NEW_CAUSE != 0) but the CPU never receives them, causing complete loss of network connectivity. Fix by calling on_each_cpu(mvneta_percpu_enable) in the resume path to unconditionally unmask the MPIC per-CPU interrupt regardless of pre-suspend state.

Gravité et risque d'exploitation

CVE-2026-72409 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.72 %, ce qui la place devant 52.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, 7.2, <1cc312dc8bc78fa24c80d5bc193dbf5b57a99cc6, 0, <=7.1.*, <8c7a489aa71d2693752b2e794a68bf672d16c829, 4.4, 6.1.178, <fd398d6480987e4c84fff0aaab6b9d6642a93343, 12bb03b436dad56692e9a103ed26156156bef5d2, <=5.10.*, <=6.6.*, 6.12.97, <be626ac1faadd49c2cead9f9cd06ba8752d81563, <=6.18.*, <b84dd48f9da1eb132bdc06a944423cd5a1641ef1, <5bdb33ff6e58bdc43632e98b30723eb65352d671, <82c13027ed283b856017adee970dbfdffce5c6b8, 5.15.212, 6.6.145, 5.10.261, <=*, <=5.15.*, <bf88cd3b649bc3e638f1e8a77649581852747a68, <4.4) 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

Rechercher une autre CVE