Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.5%
CVSS Severity
CVSS v3 Score 7.8
References
Products affected by CVE-2026-43178
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cpe:2.3:o:linux:linux_kernel:6.12.70
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cpe:2.3:o:linux:linux_kernel:6.12.72
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cpe:2.3:o:linux:linux_kernel:6.12.74
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cpe:2.3:o:linux:linux_kernel:6.18.10
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cpe:2.3:o:linux:linux_kernel:6.18.11
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cpe:2.3:o:linux:linux_kernel:6.18.13
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cpe:2.3:o:linux:linux_kernel:6.18.14
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cpe:2.3:o:linux:linux_kernel:6.19
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cpe:2.3:o:linux:linux_kernel:6.19.1
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cpe:2.3:o:linux:linux_kernel:6.19.3
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cpe:2.3:o:linux:linux_kernel:6.19.4