CVE-2026-43178: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput() in do_procmap_query() When user provides incorrectly sized buffer for build ID for PROCMAP_QUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocked mmap_lock/per-VMA lock and did mmput(), so original goto out is now wrong and will double-mmput() mm_struct. Fix by jumping further to clean up only vm_file and name_buf.

Affected products

• Linux Linux Kernel: from 6.12.70, before 6.12.75 (fixed in 6.12.75); from 6.18.10, before 6.18.16 (fixed in 6.18.16); from 6.19.1, before 6.19.6 (fixed in 6.19.6); version 6.19 only

Published 2026-05-06. Last modified 2026-07-15.