CVE-2025-68349
Null Pointer Dereference in Linux Kernel NFSv4 Causes Crash
Publication date: 2025-12-24
Last updated on: 2025-12-24
Assigner: kernel.org
Description
Description
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in the Linux kernel's NFSv4/pNFS subsystem involves improper handling of the NFS_INO_LAYOUTCOMMIT flag in the function pnfs_mark_layout_stateid_invalid. Specifically, if the layout is null during certain operations (such as write_inode -> nfs4_write_inode -> pnfs_layoutcommit_inode), the system may attempt to reference a null layout because the NFS_INO_LAYOUTCOMMIT flag was not cleared properly. This can lead to a crash. The fix involves clearing the NFS_INO_LAYOUTCOMMIT flag to prevent referencing a null layout.
How can this vulnerability impact me? :
This vulnerability can cause the Linux kernel to crash during NFSv4/pNFS operations when the layout is null but still referenced due to the uncleared NFS_INO_LAYOUTCOMMIT flag. Such crashes can lead to system instability, potential denial of service, and disruption of file system operations relying on NFSv4/pNFS.