CVE-2026-43178
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedMay 6, 2026
First seenMay 6, 2026
Weakness typeCWE-1341CWE-1341
How to fix
Update
- linux linux_kernel6.12.75, 6.18.16, 6.19.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.12.70 ≤ v < 6.12.75, 6.18.10 ≤ v < 6.18.16, 6.19.1 ≤ v < 6.19.6, 6.19 | 6.12.75, 6.18.16, 6.19.6 |
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