landlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork()

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Summary

CVECVE-2026-46057
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:25 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ead9079f75696a028aea8860787770c80eddb8f9 2fcde49092aac55d5beef43fdd3633217672f7d1 git Not specified
CNA Linux Linux affected ead9079f75696a028aea8860787770c80eddb8f9 1c513b8a00df13d231021e74ad92babb3fedf64a git Not specified
CNA Linux Linux affected ead9079f75696a028aea8860787770c80eddb8f9 874c8f83826c95c62c21d9edfe9ef43e5c346724 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1c513b8a00df13d231021e74ad92babb3fedf64a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2fcde49092aac55d5beef43fdd3633217672f7d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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