CVE-2026-43178
procfs: fix possible double mmput() in do_procmap_query()
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
3th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 6, 2026 |
| Last Updated | May 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
b9b97e6aeb534315f9646b2090d1a5024c6a4e82 < f9fe092084cd04deea18747f58a2304026e76aaa cbc03ce3e6ce7e21214c3f02218213574c1a2d08 < 8adaff87db143583e08eec4f4e7788f1ef8af94d b5cbacd7f86f4f62b8813688c8e73be94e8e1951 < 90f5e87c9b75833b9ef3a4415b92c0247f28ab2f b5cbacd7f86f4f62b8813688c8e73be94e8e1951 < 61dc9f776705d6db6847c101b98fa4f0e9eb6fa3 6.12.70 < 6.12.75 6.18.10 < 6.18.16
Linux / Linux
6.19
References
git.kernel.org: https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa git.kernel.org: https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d git.kernel.org: https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f git.kernel.org: https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3