CVE-2026-45935
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Buffer Overflow in Linux Kernel NTFS3

Publication date: 2026-05-27

Last updated on: 2026-05-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot In the 'DeleteIndexEntryRoot' case of the 'do_action' function, the entry size ('esize') is retrieved from the log record without adequate bounds checking. Specifically, the code calculates the end of the entry ('e2') using: e2 = Add2Ptr(e1, esize); It then calculates the size for memmove using 'PtrOffset(e2, ...)', which subtracts the end pointer from the buffer limit. If 'esize' is maliciously large, 'e2' exceeds the used buffer size. This results in a negative offset which, when cast to size_t for memmove, interprets as a massive unsigned integer, leading to a heap buffer overflow. This commit adds a check to ensure that the entry size ('esize') strictly fits within the remaining used space of the index header before performing memory operations.
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Meta Information
Published
2026-05-27
Last Modified
2026-05-30
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-45935
EUVD
EUVD-2026-32219
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's NTFS3 filesystem driver, specifically in the 'DeleteIndexEntryRoot' case of the 'do_action' function.

The issue arises because the entry size ('esize') is read from a log record without proper bounds checking. If 'esize' is maliciously large, calculations that determine memory boundaries become incorrect, causing a pointer to exceed the buffer size.

This leads to a negative offset being cast to an unsigned size for a memory move operation (memmove), resulting in a heap buffer overflow.

The vulnerability was fixed by adding a check to ensure that 'esize' fits strictly within the remaining used space of the index header before any memory operations are performed.

Impact Analysis

This vulnerability can lead to a heap buffer overflow in the Linux kernel when processing NTFS filesystem operations.

Heap buffer overflows can cause system crashes, data corruption, or potentially allow an attacker to execute arbitrary code with kernel privileges.

Therefore, exploitation of this vulnerability could compromise system stability and security.

Mitigation Strategies

The vulnerability is a heap buffer overflow in the Linux kernel's ntfs3 filesystem driver caused by inadequate bounds checking in the DeleteIndexEntryRoot function.

To mitigate this vulnerability immediately, you should update your Linux kernel to a version that includes the fix for this issue, which adds proper bounds checking on the entry size before memory operations.

Until an update is applied, avoid mounting or accessing NTFS3 filesystems that could trigger this vulnerability.

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