Use-after-free in Linux kernel - CVE-2026-98533

Vulnerability identifier: #VU156835

CSH Severity: Low

CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98533

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to use-after-free in the Linux kernel's IPE dm-verity root-hash handling when a root hash is replaced while policy evaluation still references it. A local privileged user can potentially exploit this concurrent access to freed memory to cause a kernel crash and denial of service.

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/2776e9c28513a1c855a94792b292cbcc533418c8
• https://git.kernel.org/stable/c/3bd335ed62444bec61201df7d368a0779e5bd300
• https://git.kernel.org/stable/c/599d0498a39319285afa908762e0c9fad29f772e
• https://git.kernel.org/stable/c/d7c5bd3159235edb0f2febe2cd3d3b0fb53986f1

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