Medium 5.5Published Mar 18, 2026

CVE-2025-71266fs: ntfs3: check return value of indx_find to avoid infinite loop

Updated under an hour ago (Oct 27, 2026, 11:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: check return value of indx_find to avoid infinite loop We found an infinite loop bug in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A malformed dentry in the ntfs3 filesystem can cause the kernel to hang during the lookup operations. By setting the HAS_SUB_NODE flag in an INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the VCN pointer, an attacker can cause the indx_find() function to repeatedly read the same block, allocating 4 KB of memory each time. The kernel lacks VCN loop detection and depth limits, causing memory exhaustion and an OOM crash. This patch adds a return value check for fnd_push() to prevent a memory exhaustion vulnerability caused by infinite loops. When the index exceeds the size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find() function checks this return value and stops processing, preventing further memory allocation.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	82cae269cfa953032fbb8980a7d554d60fb00b17 builds before 14c3188afbedfd5178bbabb8002487ea14b37b56; from 82cae269cfa953032fbb8980a7d554d60fb00b17 before 435d34719db0e130f6f0c621d67ed524cc1a7d10; 82cae269cfa953032fbb8980a7d554d60fb00b17 builds before 68e32694be231c1cdb99b7637a657314e88e1a96; from 82cae269cfa953032fbb8980a7d554d60fb00b17 before 398e768d1accd1f5645492ab996005d7aa84a5b0; from 82cae269cfa953032fbb8980a7d554d60fb00b17 before b0ea441f44ce64fa514a415d4a9e6e2b06e7946c; 82cae269cfa953032fbb8980a7d554d60fb00b17 builds before 0ad7a1be44479503dbe5c699759861ef5b8bd70c; from 82cae269cfa953032fbb8980a7d554d60fb00b17 before 1732053c8a6b360e2d5afb1b34fe9779398b072c	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.15.1 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 5.15	NVD

References

References

https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56	patch
https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10	patch
https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96	patch
https://git.kernel.org/stable/c/398e768d1accd1f5645492ab996005d7aa84a5b0	patch
https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c	patch
https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c	patch
https://git.kernel.org/stable/c/1732053c8a6b360e2d5afb1b34fe9779398b072c	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.