Bug 2427121 (CVE-2025-68764)

Summary: CVE-2025-68764 kernel: NFS: Automounted filesystems should inherit ro,noexec,nodev,sync flags
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A security bypass vulnerability was found in the Linux kernel's NFS client implementation. When a filesystem is automounted, user-specified security-related mount flags such as "ro" (read-only), "noexec" (no execution), "nodev" (no device files), and "sync" are not properly inherited by the automounted filesystem. This allows operations that should be restricted by the parent mount options.
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Description OSIDB Bzimport 2026-01-05 10:02:46 UTC 
In the Linux kernel, the following vulnerability has been resolved:

NFS: Automounted filesystems should inherit ro,noexec,nodev,sync flags

When a filesystem is being automounted, it needs to preserve the
user-set superblock mount options, such as the "ro" flag.
Comment 1 Vipul Nair 2026-01-05 10:45:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026010516-CVE-2025-68764-107e@gregkh/T