fs/ntfs3: prevent uninitialized lcn caused by zero len

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Summary

CVECVE-2026-53029
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:14 UTC
Updated2026-06-24 17:17:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: prevent uninitialized lcn caused by zero len syzbot reported a uninit-value in ntfs_iomap_begin [1]. Since runs was not touched yet, run_lookup_entry() immediately fails and returns false, which makes the value of "*len" 0. Simultaneously, the new value and err value are also 0, causing the logic in attr_data_get_block_locked() to jump directly to ok, ultimately resulting in *lcn being triggered before it is set [1]. In ntfs_iomap_begin(), the check for a 0 value in clen is moved forward to before updating lcn to avoid this [1]. [1] BUG: KMSAN: uninit-value in ntfs_iomap_begin+0x8c0/0x1460 fs/ntfs3/inode.c:825 ntfs_iomap_begin+0x8c0/0x1460 fs/ntfs3/inode.c:825 iomap_iter+0x9b7/0x1540 fs/iomap/iter.c:110 Local variable lcn created at: ntfs_iomap_begin+0x15d/0x1460 fs/ntfs3/inode.c:786

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 10d7c95af043b45a85dc738c3271bf760ff3577e 485f750cac3d8bdf5552a0e3d79ce5e3a03ece49 git Not specified
CNA Linux Linux affected 10d7c95af043b45a85dc738c3271bf760ff3577e e98266e823a1fa06fe6499df61aeaac2fd6f7a49 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e98266e823a1fa06fe6499df61aeaac2fd6f7a49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/485f750cac3d8bdf5552a0e3d79ce5e3a03ece49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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