Linux Kernel up to 7.1.7/7.2-rc5 ntfs ntfs_rl_realloc/ntfs_rl_realloc_nofail integer overflow

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.1.7/7.2-rc5. This impacts the function ntfs_rl_realloc/ntfs_rl_realloc_nofail of the component ntfs. The manipulation results in integer overflow. This vulnerability is cataloged as CVE-2026-74570. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.7/7.2-rc5. It has been classified as very critical. Affected is the function ntfs_rl_realloc/ntfs_rl_realloc_nofail of the component ntfs. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ntfs: harden runlist realloc size calculations Add a shared helper to safely convert runlist element counts to byte sizes using overflow checks, and use it in both ntfs_rl_realloc() and ntfs_rl_realloc_nofail().

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-74570 since 08/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 7.1.8 or 7.2-rc6 eliminates this vulnerability. Applying the patch 57e7b8bf7b02a0140463fea786e5172cbdf2da2f/8bed376124ab4505b70083a2b91f2c7ef6d51e24 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.2-rc1
• 7.2-rc2
• 7.2-rc3
• 7.2-rc4
• 7.2-rc5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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