CVE-2026-43178In 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_QUER…
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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
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-415, CWE-1341
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
linux linux_kernel linux:linux_kernel | from 6.12.70 before 6.12.75; from 6.18.10 before 6.18.16; from 6.19.1 before 6.19.6; 6.19 | NVD |
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
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.