Improper resource shutdown or release in Linux kernel - CVE-2026-64105

Vulnerability identifier: #VU138537

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64105

CWE-ID: CWE-404

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource management in kvm_vgic_vcpu_init error handling in arch/arm64/kvm/arm.c when creating a virtual CPU and initialization fails after private IRQ allocation. A local user can trigger a failed virtual CPU creation sequence to cause a denial of service.

The issue occurs when redistributor iodev registration fails after private IRQs have already been allocated.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/173fb86e5519dbe7aabed1f5fa7456152a4a2e38
• https://git.kernel.org/stable/c/7023900b4988fb6f4a59d304d878003ff562e98d
• https://git.kernel.org/stable/c/e690caa54a6139d98495ac69626807623520babd
• https://git.kernel.org/stable/c/f19c354dbd457759dfcf1195ab4bdba2bb568323

• Improper resource shutdown or release in Linux kernel arm64 kvm
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia