CVE-2026-46062
Analyzed Analyzed - Analysis Complete
Integer Overflow in Linux Kernel NTFS3 Driver

Publication date: 2026-05-27

Last updated on: 2026-06-16

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix integer overflow in run_unpack() volume boundary check The volume boundary check `lcn + len > sbi->used.bitmap.nbits` uses raw addition which can wrap around for large lcn and len values, bypassing the validation. Use check_add_overflow() as is already done for the adjacent prev_lcn + dlcn and vcn64 + len checks added by commit 3ac37e100385 ("ntfs3: Fix integer overflow in run_unpack()"). Found by fuzzing with a source-patched harness (LibAFL + QEMU).
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Meta Information
Published
2026-05-27
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46062
EUVD
EUVD-2026-32444
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.7 (inc) to 6.12.86 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.175 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.140 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.27 (exc)
linux linux_kernel From 6.19 (inc) to 7.0.4 (exc)
linux linux_kernel From 5.15 (inc) to 5.15.209 (exc)
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Exploitability
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CWE ID Description
CWE-190 The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
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Executive Summary

This vulnerability is an integer overflow issue in the Linux kernel's ntfs3 driver, specifically in the run_unpack() function's volume boundary check.

The problem occurs because the volume boundary check uses raw addition (lcn + len) which can wrap around for large values, allowing the validation to be bypassed.

The fix involves using a safer addition check function, check_add_overflow(), to prevent this wraparound, as was done for similar checks in related code.

Impact Analysis

This vulnerability in the Linux kernel's ntfs3 driver involves an integer overflow in the run_unpack() volume boundary check. The flawed addition can wrap around for large values, bypassing validation. This could potentially lead to incorrect handling of NTFS volume data, which might cause system instability, data corruption, or security issues related to improper volume boundary checks.

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