Use-after-free in Linux kernel - CVE-2026-98606

Vulnerability identifier: #VU156912

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-2026-98606

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to trigger invalid kernel memory accesses and potentially cause a denial of service.

The vulnerability exists due to use-after-free in virtio_gpu_vram_create() in the Linux kernel virtio GPU driver when handling object creation failures. A local user can trigger an error path that frees a GEM object without removing its registered VMA offset node, causing subsequent offset lookups or insertions to access freed memory and potentially crash the system.

Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/036d28db1818af2f9d80db771f5405da84d7732d
• https://git.kernel.org/stable/c/03bdbf182082694ab2add620d85f1a8b8f51bbbc
• https://git.kernel.org/stable/c/5118b5fdf1eb9922a0cdd2afd25252081e2d4302
• https://git.kernel.org/stable/c/5c2cb3dd1447752b73d4f44d6b7434bc5259bfec
• https://git.kernel.org/stable/c/7c8deb77d05bcc8f79e255f669d82ec6ce91be12
• https://git.kernel.org/stable/c/977c2934064969503cabf98b1135d202ff62822e
• https://git.kernel.org/stable/c/a9bb8f8fd5694185c2f71ff91869afb300aab392

• Use-after-free in Linux kernel drm virtio driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more