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Vulnerability record · CVE-2026-45935 · published 27 May 2026

CVE-2026-45935: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.20% · top 91.0% CWE-125 · Out-of-bounds read Undergoing Analysis
7.8CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
24 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/36c03f7f177b34d51f1cf1d2304b1074607bf4b0 Patch
https://git.kernel.org/stable/c/78942172d5bff4d4afed8674abc09cc560ce44a0 Patch
https://git.kernel.org/stable/c/a584b9d1059b29e97e17c919274e9adfb846f2a0 Patch
https://git.kernel.org/stable/c/b271c9cb85927210b1b799e55ee7f702d12b4336 Patch
https://git.kernel.org/stable/c/b2bc7c44ed1779fc9eaab9a186db0f0d01439622 Patch
https://git.kernel.org/stable/c/c065541b71b79874c83d418a9acd18ad5826339b Patch
https://git.kernel.org/stable/c/f3b437a4c3e022a1449658ae9f3dd34859894513 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-45935), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.