CVE-2026-46057
LowCVSS 3.3Exploitation Probability (EPSS)
Low risk6th percentile — higher than 6% of all known CVEs
Summary
A vulnerability in the Linux kernel related to the inheritance of LOG_SUBDOMAINS_OFF during fork() operations has been resolved. The issue was that the Landlock security blob was not copied when the source credential had no assigned domain, leading to unexpected audit results in child processes.
Risk Assessment
Organizations may be exposed to unauthorized disclosure of information in audit logs, potentially leading to compliance and data security issues. Child processes may not adhere to expected security policies, increasing the risk of attacks.
Recommendation
It is recommended to update the Linux kernel to the latest version to eliminate this vulnerability. Additionally, security configurations related to the use of Landlock should be reviewed and adjusted.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: landlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork() hook_cred_transfer() only copies the Landlock security blob when the source credential has a domain. This is inconsistent with landlock_restrict_self() which can set LOG_SUBDOMAINS_OFF on a credential without creating a domain (via the ruleset_fd=-1 path): the field is committed but not preserved across fork() because the child's prepare_creds() calls hook_cred_transfer() which skips the copy when domain is NULL. This breaks the documented use case where a process mutes subdomain logs before forking sandboxed children: the children lose the muting and their domains produce unexpected audit records. Fix this by unconditionally copying the Landlock credential blob.