Double free in Linux kernel - CVE-2026-72406

Vulnerability identifier: #VU143029

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-2026-72406

CWE-ID: CWE-415

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 double free in gem_init_one() in the sungem network driver when handling a failed register_netdev() call during device probe. A local user can trigger the vulnerable error path to cause a denial of service.

The issue occurs in the probe error cleanup path for a half-registered device.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/331c99029a1cee1111f82f63d15b3cdebefbd341
• https://git.kernel.org/stable/c/36dea2f639249460d13f6ca66b2a9064187cd34d
• https://git.kernel.org/stable/c/a63eaf7605d1579cf3f551792e478cfaf5ac37d1
• https://git.kernel.org/stable/c/b15a3cc68e2450aa0edd94a74a7bdd45fcc17dd9
• https://git.kernel.org/stable/c/bc49e8746584564dba47d963d1916cc876fc6f6b
• https://git.kernel.org/stable/c/f1d04fefb0c2a2de32d9cee22cdc2088be3758d1
• https://git.kernel.org/stable/c/f3bd60b26814b7c3c57c629abb0857dfc76d214a
• https://git.kernel.org/stable/c/fb73cdc50b6755e5c3a80a195b2708a39ada0230

• Double free in Linux kernel ethernet sun driver
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0