Use-after-free in Linux kernel - CVE-2026-63906

Vulnerability identifier: #VU138742

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-2026-63906

CWE-ID: CWE-416

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 use-after-free in omap2430_probe() in the omap2430 USB driver when handling a crafted platform device state. A local user can trigger the vulnerable code path to cause a denial of service.

The issue occurs because a device tree node reference is released before its last access in both the success and error paths.

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/27e62532228dc42367bb43ebbcd7bf49d8db2b0d
• https://git.kernel.org/stable/c/632fd888fe33083927e29ef651ac1aba345edd9e
• https://git.kernel.org/stable/c/69f9f2b30af03d9b6e83f78fb0f734b6066d4678
• https://git.kernel.org/stable/c/b987f380620b38c84f054d5ff5c05861a7c2203b
• https://git.kernel.org/stable/c/d53e4c41331f57b9fd78cbf3e480c6ce20aea07b
• https://git.kernel.org/stable/c/e194ce048f5a6c549b3a23a8c568c6470f40f772

• Use-after-free in Linux kernel usb musb driver
• 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