Use-after-free in Linux kernel - CVE-2026-98517

Vulnerability identifier: #VU156818

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-2026-98517

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a use-after-free in the Linux kernel Nouveau driver's nouveau_uvmm_sm() mapping path when a buffer object in TTM_PL_SYSTEM has its struct ttm_resource incorrectly treated as struct nouveau_mem. A local user can trigger mapping operations involving such a buffer object to cause a read beyond the resource allocation, potentially causing a kernel crash.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (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 (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
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/0d29bf51f8dddcf8556bf76710d3dd3024a1a717
• https://git.kernel.org/stable/c/1245b4b43da67596be61600dbd746539c79495ac
• https://git.kernel.org/stable/c/3359a372efb6d585c97019ee1b7f1874442bcebe
• https://git.kernel.org/stable/c/34d9dffaf0ff43ac395a7955b3f7b5d9d6154bf3
• https://git.kernel.org/stable/c/5b2fffbba290ed74f381911b9986570bc10feaa4

• Use-after-free in Linux kernel drm nouveau driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more