Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64598

Vulnerability identifier: #VU141258

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-2026-64598

CWE-ID: CWE-703

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 improper handling of an error pointer in smb2_aead_req_alloc() when processing SMB client requests. A local user can trigger the bug to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp-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) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

• https://git.kernel.org/stable/c/61f28012e5650c619223decdb7970e0d3162e949
• https://git.kernel.org/stable/c/a187883cc1dc784a4d32537f5d316f1b7b9ad76f
• https://git.kernel.org/stable/c/a1cc432cb0b0a1f74f98a0db3b94ca880c7947ac
• https://git.kernel.org/stable/c/aa37f5fef78dd11cbf983269da2031e12625c56d
• https://git.kernel.org/stable/c/cad756733dc3985188983f3e2eb77e2927209099

• Improper Check or Handling of Exceptional Conditions in Linux kernel smb client
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0