Use-after-free in Linux kernel - CVE-2026-43276

Vulnerability identifier: #VU130435

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-2026-43276

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 a use-after-free in the mana driver service rescan PCI path when handling a failed resume during service reset and rescan. A local user can trigger this code path to cause a denial of service.

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Ubuntu
kernel (Red Hat package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 5.14.0-687.22.1.el9_8, 6.12.0-211.31.1.el10_2
linux-azure (Ubuntu package) - addressed in versions 6.17.0-1015.15, 6.17.0-1015.15~24.04.1

• https://git.kernel.org/stable/c/a9a7c3203fdc4d4a8d8a7a3b1ed05d2bb4c6e77e
• https://git.kernel.org/stable/c/f975a0955276579e2176a134366ed586071c7c6a
• https://git.kernel.org/stable/c/fa3c2f8d9152344a478abb847081c1b5f84a94f5

• Use-after-free in Linux kernel microsoft mana driver
• Ubuntu update for linux-azure
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 10 update for kernel