CVE-2026-46023
dm mirror: fix integer overflow in create_dirty_log()
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.
INFO
Published Date :
May 27, 2026, 2:17 p.m.
Last Modified :
June 1, 2026, 5:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to include the fix for dm mirror.
- Ensure param_count is validated before addition.
- Compare param_count against argc - 2.
References to Advisories, Solutions, and Tools
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CVE-2026-46023.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46023 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46023
weaknesses.
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 01, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/249c831183fb806c8e3b14c7c4c1d2fb68cf37fb Added Reference https://git.kernel.org/stable/c/ae59b3025609d5a0a39cf5b2b94e2467f6231573 Added Reference https://git.kernel.org/stable/c/e5e0ae3237584ebef510366c4cb3d5cc7c22b610 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 27, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/17a08791d428885d00e510864283a7b839792368 Added Reference https://git.kernel.org/stable/c/35f6b3281efd44d19110574663bc17a610bc73b9 Added Reference https://git.kernel.org/stable/c/47dad9eea75d33212d3d2cea10e7ed6a1bfc0713 Added Reference https://git.kernel.org/stable/c/4c788c6f921b22f9b6c3f316c4a071c05683e7de Added Reference https://git.kernel.org/stable/c/87c99a50e0fdc68a5b9b52a94d49452cd3ff02ca