CVE-2026-46023

Description

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.

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EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

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

Frequently Asked Questions

What is CVE-2026-46023? +

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.

How do I check if I'm vulnerable to CVE-2026-46023? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.