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CVE-2025-38396 is a security regression in Linux kernel secretmem anonymous-inode handling. The S_PRIVATE flag was not cleared after alloc_anon_inode(), causing Linux Security Module (LSM), including SELinux, checks to be bypassed for secretmem file descriptors. The correction fixes the secretmem bypass and exports anon_inode_make_secure_inode() so KVM guest_memfd can create anonymous inodes with an appropriate security context, replacing anonymous-inode allocation followed by manual security-context initialization through inode_init_security_anon().
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A Linux kernel security regression leaves the S_PRIVATE flag set on secretmem anonymous inodes, bypassing LSM/SELinux security checks for secretmem file descriptors. The fix uses anon_inode_make_secure_inode() to ensure proper security context initialization and exports it for KVM guest_memfd. The advisory reports a CVSS v3 base score of 7.8, with local access and low privileges required.
A Linux kernel security regression allows secretmem file descriptors to bypass LSM/SELinux security checks because the S_PRIVATE flag is not cleared. The fix exports and uses anon_inode_make_secure_inode() to create anonymous inodes with proper security context. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required.
Linux kernel secretmem Linux Security Module bypass involving anon inode security labeling.
A Linux kernel security regression affecting secretmem file descriptors: an uncleared S_PRIVATE flag could bypass LSM/SELinux security checks. The referenced Google COS kernel packages are fixed in version 18244.448.50 or later.
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Cross-references every affected SKU, including bundled OEM variants.
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