Use-after-free in Linux kernel - CVE-2026-98895

Vulnerability identifier: #VU157613

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-2026-98895

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 by triggering a kernel crash.

The vulnerability exists due to a use-after-free in the mlx5 hardware steering table management code when destroying a table with a configured default miss table. A local user can trigger destruction of such a table to leave a stale entry in the miss table's list, potentially causing a kernel crash during subsequent list access.

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/16b81428f7b5f253ab30a998bc4f4ecd1c8823f8
• https://git.kernel.org/stable/c/60e9e82f162ab7399373ff2185119289e4f6dc06
• https://git.kernel.org/stable/c/6efdc212627cecf33b594256ae4460b4c52a126a

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