CVE-2026-46023

Summary

In the Linux kernel, the following vulnerability has been resolved:

dm mirror: fix integer overflow in create_dirty_log()

The argument count calculation in create_dirty_log() performs *args_used = 2 + param_count before validating against argc. When a user provides a param_count close to UINT_MAX via the device mapper table string, this unsigned addition wraps around to a small value, causing the subsequent argc < *args_used check to be bypassed.

The overflowed param_count is then passed as argc to dm_dirty_log_create(), where it can cause out-of-bounds reads on the argv array.

Fix by comparing param_count against argc - 2 before performing the addition, following the same pattern used by parse_features() in the same file. Since argc >= 2 is already guaranteed, the subtraction is safe.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/e5e0ae3237584ebef510366c4cb3d5cc7c22b610
• https://git.kernel.org/stable/c/249c831183fb806c8e3b14c7c4c1d2fb68cf37fb
• https://git.kernel.org/stable/c/ae59b3025609d5a0a39cf5b2b94e2467f6231573
• https://git.kernel.org/stable/c/35f6b3281efd44d19110574663bc17a610bc73b9
• https://git.kernel.org/stable/c/47dad9eea75d33212d3d2cea10e7ed6a1bfc0713
• https://git.kernel.org/stable/c/87c99a50e0fdc68a5b9b52a94d49452cd3ff02ca
• https://git.kernel.org/stable/c/17a08791d428885d00e510864283a7b839792368
• https://git.kernel.org/stable/c/4c788c6f921b22f9b6c3f316c4a071c05683e7de

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