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CVE-2026-98464

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 5.16, 6.18.55, 0, <3cc6184bd5920c9685d87f4e260568feba08650d, <2af03b606aadaaeb386658ef798c79bdcdef87c1, 6.12.112, 6.6.158, <=6.6.*, 6.1.189, <e66aced74f0122380603c9910a71d77618b28f0e, <5.16, <=6.18.*, <=7.2.*, 7.2.9, <=*, 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22, <9bdbae64ae0dab93041ebc57ec4e93def793fc2d, <ea91f05a55b807ead3166546a2c75f4185ca645f, <aaad136d56d91252517272b68cd533e5714698d5, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Synchronize hrtimer callback during teardown The non-Sstc hrtimer callback clears next_set before its final uses of the enclosing vCPU. If teardown observes next_set as false while the callback is still running, kvm_riscv_vcpu_timer_cancel() skips hrtimer_cancel() and kvm_destroy_vcpus() can free the vCPU before the callback enters kvm_riscv_vcpu_set_interrupt(). A guest can arm the timer with SBI TIME and request shutdown with SBI legacy shutdown or SRST. A VMM that honors KVM_EXIT_SYSTEM_EVENT and destroys the VM supplies the teardown side of the race; no post-launch host ioctl is needed to arm or request teardown. On upstream master 62cc90241548, generic KASAN reported: BUG: KASAN: slab-use-after-free in do_raw_spin_lock Write of size 4 at addr ff60000005e58898 kvm_riscv_vcpu_set_interrupt kvm_riscv_vcpu_hrtimer_expired __hrtimer_run_queues hrtimer_interrupt The object was allocated by KVM_CREATE_VCPU and freed concurrently by: kvm_destroy_vcpus kvm_arch_destroy_vm kvm_destroy_vm __fput For deterministic validation, I added mdelay(1000) immediately after the existing next_set = false assignment. This only widens the existing post-clear callback window. A no-delay trace build naturally reached the callback-after-teardown-start/before-deinit ordering in 12 of 200 runs, but 1,500 stock-kernel stress iterations did not produce a KASAN report, so natural reproduction is timing-sensitive. Always invoke hrtimer_cancel() for an initialized timer. Preserve the existing -EINVAL result when the timer is no longer set, but only after synchronizing with a running callback. With this patch, hrtimer_cancel() blocked for the full widened callback window before vCPU destruction. KASAN reported no error in 100 fixed-and-widened runs or 200 fix-only timing-sweep runs.

Gravité et risque d'exploitation

CVE-2026-98464 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 0.17 %, ce qui la place devant 6.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 5.16, 6.18.55, 0, <3cc6184bd5920c9685d87f4e260568feba08650d, <2af03b606aadaaeb386658ef798c79bdcdef87c1, 6.12.112, 6.6.158, <=6.6.*, 6.1.189, <e66aced74f0122380603c9910a71d77618b28f0e, <5.16, <=6.18.*, <=7.2.*, 7.2.9, <=*, 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22, <9bdbae64ae0dab93041ebc57ec4e93def793fc2d, <ea91f05a55b807ead3166546a2c75f4185ca645f, <aaad136d56d91252517272b68cd533e5714698d5, 7.3) 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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