What’s Vulnerable › Vulnerabilities

CVE-2025-71311: fs/ntfs3: Initialize new folios before use

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-14
• Weakness: CWE-908

Description

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Initialize new folios before use KMSAN reports an uninitialized value in longest_match_std(), invoked from ntfs_compress_write(). When new folios are allocated without being marked uptodate and ni_read_frame() is skipped because the caller expects the frame to be completely overwritten, some reserved folios may remain only partially filled, leaving the rest memory uninitialized.

Affected products

• Linux kernel: from 6.11 before 6.12.75; from 6.13 before 6.18.14; from 6.19 before 6.19.4 — fixed in 6.12.75, 6.18.14, 6.19.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.75, 6.18.14, 6.19.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/41d79f8e2a36622d148719bf7c18b46ac1264284
• https://git.kernel.org/stable/c/5a30cc03bde169ad558695b26da6ea7e55f6194a
• https://git.kernel.org/stable/c/dd6c81527d097b3b0bf5a15c2fdc9657d045144c
• https://git.kernel.org/stable/c/f223ebffa185cc8da934333c5a31ff2d4f992dc9

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