What’s Vulnerable › Vulnerabilities

CVE-2025-68728: ntfs3: fix uninit memory after failed mi_read in mi_format_new

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-24 · updated 2026-10-13

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix uninit memory after failed mi_read in mi_format_new Fix a KMSAN un-init bug found by syzkaller. ntfs_get_bh() expects a buffer from sb_getblk(), that buffer may not be uptodate. We do not bring the buffer uptodate before setting it as uptodate. If the buffer were to not be uptodate, it could mean adding a buffer with un-init data to the mi record. Attempting to load that record will trigger KMSAN. Avoid this by setting the buffer as uptodate, if it’s not already, by overwriting it.

Affected products

• Linux kernel: 5.15 — fixed in 6.19

How to fix

Upgrade to a fixed version: Linux kernel 6.19. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/46f2a881e5a7311d41551edb3915e4d4e8802341
• https://git.kernel.org/stable/c/73e6b9dacf72a1e7a4265eacca46f8f33e0997d6
• https://git.kernel.org/stable/c/7ce8f2028dfccb2161b905cf8ab85cdd9e93909c
• https://git.kernel.org/stable/c/81ffe9a265df3e41534726b852ab08792e3d374d
• https://git.kernel.org/stable/c/8bf729b96303bb862d7c6dc05edcf51274ae04cf
• https://git.kernel.org/stable/c/afb144bc8e920db43a23e996eb0a6f9bdea84341
• https://git.kernel.org/stable/c/c70b3abfd530c7f574bc25a5f84707e6fdf0def8

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