CVE-2020-25221

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This can be triggered by any 64-bit process that can use ptrace() or process_vm_readv(), aka CID-9fa2dd946743.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-672

Affected software

No affected versions have been published.

Timeline

Published
Sep 10, 2020
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2020-25221: High severity, CVSS 7.8 | Vulnix