Incorrect authorization in Linux kernel - CVE-2026-93191

Vulnerability identifier: #VU150803

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-93191

CWE-ID: CWE-863

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose messages to an unauthorized receiver.

The vulnerability exists due to improper authorization in smack_msg_queue_msgrcv when processing messages through the pipelined_send optimization for a waiting receiver. A local user can send a message to a queue while an unauthorized target task is waiting to receive it to disclose messages to an unauthorized receiver.

Linux kernel
Debian Linux
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)
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
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/4e49f997ef0c569e09b42aab6bd38c7c54ea095d
• https://git.kernel.org/stable/c/7be4bd21c50afa83c93799b0f16cf5bfa493194e
• https://git.kernel.org/stable/c/c2ab27c2e11591524b1378c24ad18882a425d1fa
• https://git.kernel.org/stable/c/d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe
• https://git.kernel.org/stable/c/dbece6c2f80b0470d8d99d7a016827dce99ed6e3
• https://git.kernel.org/stable/c/e35dc5a4ed6d1e536382d80c685187511ff248a1
• https://git.kernel.org/stable/c/ec47f4177046dfaaf1cebb15f4d2e7b543475daf
• https://git.kernel.org/stable/c/fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5

• Incorrect authorization in Linux kernel smack
• Debian update for linux
• 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