CVE-2026-43178 — procfs: fix possible double mmput() in do_procmap_query()
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 b…
Published: 2026-05-06 · CVSS: 7.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7