PT-2026-26043 · Linux+1 · Linux Kernel+1

Published 2025-01-01 · Updated 2026-04-20 · CVE-2025-71266

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

AV:L/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the ntfs3 file system that can lead to a Denial-of-Service (DoS) condition. A specially crafted dentry within the ntfs3 filesystem can cause the kernel to hang during lookup operations. An attacker can manipulate the HAS SUB NODE flag in an INDEX ENTRY and the VCN pointer to 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, leading to memory exhaustion and an Out-of-Memory (OOM) crash. The issue stems from the absence of a return value check for fnd push(), which can result in infinite loops. The fnd push() function returns -EINVAL when the index exceeds the size of the fnd->nodes array, but the indx find() function did not previously check this return value.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

BDU:2026-04644

CVE-2025-71266

Affected Products

Linux Kernel

Ntfs3

References · 25

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71266.json · Exploit
• https://osv.dev/vulnerability/BELL-CVE-2025-71266 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-71266 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2025-71266 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-71266 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-71266 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-71266 · Security Note
• https://ubuntu.com/security/CVE-2025-71266 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-04644 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2025-71266 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-71266 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-71266 · Vendor Advisory
• https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56 · Note
• https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96 · Note
• https://dbugs.ptsecurity.com/vulnerability/PT-2026-26043 · Note