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CVE-2025-21999 is a use-after-free vulnerability in the Linux kernel procfs implementation. A race between kernel module removal and inode instantiation allows proc_get_inode() to dereference module-owned proc_ops after the owning module has been freed. Retaining the proc directory entry does not preserve the lifetime of the module's operations structure. The vulnerable regular-file processing can access proc_read_iter through this stale pointer, causing a kernel page fault. The fix stores the information needed for inode instantiation in the proc directory entry before registration, avoiding subsequent dereferences of module-owned operations.
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A Linux kernel use-after-free vulnerability caused by a race between module unloading and /proc inode instantiation. proc_get_inode() can dereference module-owned proc_ops after the module has been freed, causing a kernel fault. The fix stores information needed for inode instantiation before proc_register(), avoiding the unsafe dereference. The advisory assigns a CVSS v3 score of 7.8 and recommends updating the Echo linux package and related packages to version 6.1.133-1 or later.
A high-severity local Linux kernel use-after-free vulnerability in proc_get_inode() caused by a race condition between module unloading and /proc inode creation. It affects Google COS packages sys-kernel/csql-kernel-6_1 and sys-kernel/lakitu-kernel-5_15 before the specified security update.
A Linux kernel use-after-free vulnerability in proc_get_inode().
A Linux kernel use-after-free vulnerability in proc_get_inode().
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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