What’s Vulnerable › Vulnerabilities

CVE-2023-52631: fs/ntfs3: Fix an NULL dereference bug

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2024-04-02 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix an NULL dereference bug The issue here is when this is called from ntfs_load_attr_list(). The "size" comes from le32_to_cpu(attr->res.data_size) so it can't overflow on a 64bit systems but on 32bit systems the "+ 1023" can overflow and the result is zero. This means that the kmalloc will succeed by returning the ZERO_SIZE_PTR and then the memcpy() will crash with an Oops on the next line.

Affected products

• Linux kernel: from 5.15 before 5.15.149; from 5.16 before 6.1.78; from 6.2 before 6.6.17; from 6.7 before 6.7.5; 6.8-rc1, 6.8-rc2, 6.8-rc3 — fixed in 5.15.149, 6.1.78, 6.6.17, 6.7.5

How to fix

Upgrade to a fixed version: Linux kernel 5.15.149, 6.1.78, 6.6.17, 6.7.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/686820fe141ea0220fc6fdfc7e5694f915cf64b2
• https://git.kernel.org/stable/c/ae4acad41b0f93f1c26cc0fc9135bb79d8282d0b
• https://git.kernel.org/stable/c/b2dd7b953c25ffd5912dda17e980e7168bebcf6c
• https://git.kernel.org/stable/c/ec1bedd797588fe38fc11cba26d77bb1d9b194c6
• https://git.kernel.org/stable/c/fb7bcd1722bc9bc55160378f5f99c01198fd14a7
• https://git.kernel.org/stable/c/686820fe141ea0220fc6fdfc7e5694f915cf64b2
• https://git.kernel.org/stable/c/ae4acad41b0f93f1c26cc0fc9135bb79d8282d0b
• https://git.kernel.org/stable/c/b2dd7b953c25ffd5912dda17e980e7168bebcf6c
• https://git.kernel.org/stable/c/ec1bedd797588fe38fc11cba26d77bb1d9b194c6
• https://git.kernel.org/stable/c/fb7bcd1722bc9bc55160378f5f99c01198fd14a7

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