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CVE-2025-21796 is a use-after-free vulnerability in the Linux kernel NFS server's ACL handling. When retrieval of acl_default fails, acl_access and acl_default are released, but acl_access retains a pointer to a released POSIX ACL object. Subsequent cleanup in nfs3svc_release_getacl can trigger a reference-count underflow and use-after-free warning. Systems configured with panic_on_warn can experience a kernel panic.
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A use-after-free vulnerability in the Linux kernel NFS server's ACL handling. Failure to clear ACL pointers after releasing them can cause reference-count underflow and a kernel panic. The advisory identifies affected Google Container-Optimized OS kernel packages and reports a CVSS v3 base score of 7.8 (High).
Linux kernel NFSD ACL reference cleanup flaw.
A Linux kernel NFS server use-after-free vulnerability involving POSIX ACL cleanup. Improperly retained acl_access/acl_default pointers after releasing ACL objects can trigger a refcount underflow and potentially a kernel panic.
A high-severity Linux kernel NFS server (nfsd) use-after-free/refcount-underflow vulnerability caused by stale ACL pointers after POSIX ACL release. It can lead to kernel warnings and, where panic_on_warn is enabled, a kernel panic/denial of service.
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Cross-references every affected SKU, including bundled OEM variants.
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