CVE-2026-43178 | BDVDB-2026-330950 Detail
LinuxLinux
Description#
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: local.
Weaknesses#
- CWE-1341 Multiple Releases of Same Resource or Handle
References#
- https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa
- https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d
- https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f
- https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3
- https://access.redhat.com/security/cve/CVE-2026-43178
- https://bugzilla.redhat.com/show_bug.cgi?id=2467227
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43178.json
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.