CVE-2026-72471

Summary

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: prevent potential lcn remains uninitialized

The target VCN being sought was not found within runs[0], causing run_lookup() to return false. This causes run_lookup_entry() to return false, which in turn results in a len value of 0, and the new parameter passed to attr_data_get_block() is NULL. Collectively, these factors ultimately cause attr_data_get_block_locked() to exit prematurely without initializing lcn, thereby triggering [1].

To prevent [1], the clen check within ni_seek_data_or_hole() has been moved to occur before the lcn check.

[1] BUG: KMSAN: uninit-value in ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862 ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862 ntfs_llseek+0x22a/0x4a0 fs/ntfs3/file.c:1530 vfs_llseek fs/read_write.c:391 [inline]

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/7ae7e98b71438c494532492cbf58fc0d7f7988bb
• https://git.kernel.org/stable/c/57ac2831c8e0f168090d38e3de758c6a59db44db

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