The Linux kernel through 3.14.5 does not properly consider the presence of hugetlb entries, which allows local users to cause a denial of service (memory corruption or system crash) by accessing certain memory locations, as demonstrated by triggering a race condition via numa_maps read operations during hugepage migration, related to fs/proc/task_mmu.c and mm/mempolicy.c.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 1.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type: Allows disruption of service
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[linux-kernel] 20140318 [PATCH RESEND -mm 1/2] mm: add !pte_present() check on existing hugetlb_entry callbacks
[oss-security] 20140602 CVE-2014-3940 - Linux kernel - missing check during hugepage migration