Memory leak in Linux kernel - CVE-2026-89900

Vulnerability identifier: #VU150393

CSH Severity: Low

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

CVE-ID: CVE-2026-89900

CWE-ID: CWE-401

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a memory leak.

The vulnerability exists due to improper memory release in cec_unregister_adapter() when unregistering a CEC adapter. A local user can trigger CEC adapter unregistration to cause a memory leak.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency-hwe-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-gke (Ubuntu package)
linux-vmware (Ubuntu package)
linux-ibm-6.8 (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 6.8.0-149.149
linux-lowlatency (Ubuntu package) - update to 6.8.0-149.149.1
linux-gcp (Ubuntu package) - update to 6.8.0-1073.81
linux-azure (Ubuntu package) - update to 6.8.0-1073.82
linux-aws (Ubuntu package) - update to 6.8.0-1069.74
linux-ibm (Ubuntu package) - update to 6.8.0-1069.70
linux-oracle (Ubuntu package) - update to 6.8.0-1067.71
linux-nvidia (Ubuntu package) - update to 6.8.0-1067.70
linux-realtime (Ubuntu package) - update to 6.8.1-1064.65
linux-lowlatency-hwe-6.8 (Ubuntu package) - update to 6.8.0-149.149.1~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1071.78~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1069.74~22.04.1
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1073.82~22.04.1
linux-gkeop (Ubuntu package) - update to 6.8.0-1053.57
linux-gke (Ubuntu package) - update to 6.8.0-1068.77
linux-vmware (Ubuntu package) - update to 6.8.0-1010.10
linux-ibm-6.8 (Ubuntu package) - update to 6.8.0-1069.70~22.04.1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1073.81~22.04.1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1069.74+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1073.81+fips1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1073.82+fips1
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1064.65~22.04.1
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/695063fc57574dd117b1bc750ca189cf03a2caad
• https://git.kernel.org/stable/c/954ee95a03b4d31d4505591bfaba02c24b75776b
• https://git.kernel.org/stable/c/a24ba0653f7154e671dc8d2bf64682ab2d042792
• https://git.kernel.org/stable/c/cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c
• https://git.kernel.org/stable/c/f28a8e1ba4d67a18e4662e5acefd5a4389322366

• Memory leak in Linux kernel cec core driver
• Debian update for linux
• Ubuntu update for linux-aws-fips, linux-gcp-fips, linux-gkeop and more
• Ubuntu update for linux-azure-6.8, linux-azure-fde-6.8
• Ubuntu update for linux-aws-6.8, linux-gcp-6.8, linux-ibm-6.8 and more
• Ubuntu update for linux, linux-aws, linux-azure and more