Improper control of a resource through its lifetime in Linux kernel - CVE-2026-46057

Vulnerability identifier: #VU132432

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-2026-46057

CWE-ID: CWE-664

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause unexpected audit records.

The vulnerability exists due to improper state management in the Landlock credential blob handling across fork() when transferring credentials for a child process after muting subdomain logs without creating a domain. A local user can fork a process with crafted Landlock credential state to cause unexpected audit records.

The issue occurs when LOG_SUBDOMAINS_OFF is set through the ruleset_fd=-1 path, which commits the field without creating a Landlock domain.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-azure-fde (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-realtime (Ubuntu package) - update to 7.0.0-27.27.1
linux-gcp (Ubuntu package) - update to 7.0.0-1007.7
linux-oracle (Ubuntu package) - update to 7.0.0-1007.7
linux-aws (Ubuntu package) - update to 7.0.0-1008.8
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14
linux-azure (Ubuntu package) - update to 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-ibm (Ubuntu package) - update to 7.0.0-1009.9
linux-azure-fde (Ubuntu package) - update to 7.0.0-1009.9

• https://git.kernel.org/stable/c/1c513b8a00df13d231021e74ad92babb3fedf64a
• https://git.kernel.org/stable/c/2fcde49092aac55d5beef43fdd3633217672f7d1
• https://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724

• Improper control of a resource through its lifetime in Linux kernel selftests landlock
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure