Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.12.70, < 6.12.75 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3Patch
- https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94dPatch
- https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2fPatch
- https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaaPatch
FAQ
What is CVE-2026-43178?
CVE-2026-43178 is a vulnerability with a CVSS score of 7.8 (HIGH). 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_QUE...
How severe is CVE-2026-43178?
CVE-2026-43178 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43178?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.