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CVE-2026-46023

dm mirror: fix integer overflow in create_dirty_log()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86, and 2 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux 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 Linux

    2.6.12

  • KernelLinux

    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

References 8

git.kernel.org