CVE-2026-46057
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.
Affected versions
Linux kernel versions
6.15
and later are affected. Fixed in
6.18.27,
7.0.4,
7.1-rc1
and their respective stable series.
References
The following references provide additional information about CVE-2026-46057 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
-
PatchKernel patch commithttps://git.kernel.org/stable/c/1c513b8a00df13d231021e74ad92babb3fedf64a
-
PatchKernel patch commithttps://git.kernel.org/stable/c/2fcde49092aac55d5beef43fdd3633217672f7d1
-
PatchKernel patch commithttps://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724
Frequently asked questions
-
What is CVE-2026-46057?
CVE-2026-46057 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.15 onward and has been patched in 6.18.27, 7.0.4 and 7.1-rc1. CVE-2026-46057 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
-
Is there a patch available for CVE-2026-46057?
Yes — CVE-2026-46057 has been patched. Fixed versions include 6.18.27, 7.0.4 and 7.1-rc1. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
-
Is CVE-2026-46057 actively exploited?
No — CVE-2026-46057 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.