CVE-2026-43178

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.

Score

CVSS 3.1 7.8 High

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-05-06

Last modified

2026-08-05

Weaknesses

CWE-1341, CWE-415

Affected products

• Linux Kernel (Linux)
• Enterprise Linux (Redhat)

References

• https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3
• https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d
• https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f
• https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa
• 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