Integer overflow in Linux kernel - CVE-2026-63881

Vulnerability identifier: #VU138764

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-2026-63881

CWE-ID: CWE-190

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 integer overflow in get_queue_ids() in the amdkfd kfd debugger when processing a user-supplied queue ID array. A local user can supply crafted queue count values to cause a denial of service.

The issue affects 32-bit size_t builds.

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/4e5f808b454167cc58d7084a407a554d8ddc694d
• https://git.kernel.org/stable/c/4f9eeedc3d3151f8a226fd676c314a813edda5a1
• https://git.kernel.org/stable/c/5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c
• https://git.kernel.org/stable/c/93f5534b35a05ef8a0109c1eefa800062fee810a
• https://git.kernel.org/stable/c/de70a80992396ee306ee3a2810ad28aa1608ba9b

• Integer overflow in Linux kernel amd amdkfd 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