Use-after-free in Linux kernel - CVE-2026-89777

Vulnerability identifier: #VU150503

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89777

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to compromise system confidentiality, integrity, and availability.

The vulnerability exists due to use-after-free caused by a dangling pointer in vfio pci MSI permission-table handling when MSI permission-table initialization fails. A local user can cause MSI permission-table initialization to fail and subsequently access MSI configuration to compromise system confidentiality, integrity, and availability.

The per-device structure persists across open and close cycles.

Linux kernel
Debian Linux
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
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
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Ubuntu
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux (Debian package)

Install security update from vendor's repository.

linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1124.133
linux (Ubuntu package) - update to 7.0.0-42.42
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
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
kernel (Red Hat package) - addressed in versions 4.18.0-553.177.1.el8_10, 6.12.0-211.69.1.el10_2
kernel-rt (Red Hat package) - update to 4.18.0-553.177.1.rt7.518.el8_10
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/25cdd2a492d868cff1e519a60fe282909c52d385
• https://git.kernel.org/stable/c/533d0c5feef85ee6404b9f41d5564fac6971a008
• https://git.kernel.org/stable/c/812f1db7f0755a19ef16ecdc5cec51bcabc5eda5
• https://git.kernel.org/stable/c/d665a1688af7f8fefd7c0eb04f2a37122ce007f4
• https://git.kernel.org/stable/c/dc77acfeb979dded39b247b60fef0399536bfa77
• https://git.kernel.org/stable/c/eb84cd81040e58dd05ac190f561f2115e3367249
• https://git.kernel.org/stable/c/f0eea8f9013676b42289ec35941e848b8a543e19
• https://git.kernel.org/stable/c/fda8fb7e8179561693a786a7af593f6b944a21c1

• Use-after-free in Linux kernel vfio pci driver
• Debian update for linux
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 10 update for kernel
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more