{"cve":"CVE-2020-25221","nvd":{"published":"2020-09-10T14:15:17.590","modified":"2026-06-17T03:06:36.877","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-672"],"references":["http://www.openwall.com/lists/oss-security/2020/09/10/4","https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7","https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a","https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2","https://security.netapp.com/advisory/ntap-20201001-0003/"],"products":["linux:linux_kernel","netapp:cloud_backup","netapp:hci_compute_node","netapp:solidfire\\,_enterprise_sds_\\&_hci_storage_node","netapp:solidfire_\\&_hci_management_node","netapp:solidfire_baseboard_management_controller"],"source":"nvd","synced_at":"2026-10-19T21:09:20.498348299+00:00"},"epss":{"cve":"CVE-2020-25221","score":0.00668,"percentile":0.51922,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}