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.
総合評価: CVE-2020-25221 は中リスク（48.1/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.67%、47 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.19% | 0.67% | +0.47% |
| 2 | 2025-11-21 | 0.14% | 0.19% | +0.05% |
| 3 | 2025-11-18 | — | 0.14% | — |
EPSS の全履歴 （全 11 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | [email protected] |
| 7.2 | 2.0 | HIGH |
|
3.9 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2020-25221 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2020-25221 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2020-25221 |
suse
|
high | CVE-2020-25221 severity important: SUSE including 14 source package names (kernel-default, kernel-default-base, …), 257 product×package rows across 55 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (55 product lines)): Known Not Affected 257. | https://www.suse.com/security/cve/CVE-2020-25221/ |
ubuntu
|
medium | CVE-2020-25221 medium priority: Ubuntu including 38 source packages (linux, linux-aws, …), 228 status rows across 6 suites (bionic, focal, groovy, trusty, upstream, xenial): DNE 124, not-affected 48, released 38, ignored 18. | https://ubuntu.com/security/CVE-2020-25221 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| linux | linux_kernel | >= 5.7.0, < 5.8.7 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| netapp | cloud_backup | — | cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* |
| netapp | solidfire\,_enterprise_sds_\&_hci_storage_node | — | cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:*:*:*:*:*:*:* |
| netapp | solidfire_\&_hci_management_node | — | cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:* |
| netapp | hci_compute_node | — | cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:* |
| netapp | solidfire_baseboard_management_controller | — | cpe:2.3:h:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://www.openwall.com/lists/oss-security/2020/09/10/4 | Mailing List Third Party Advisory |
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 | Release Notes Vendor Advisory |
| https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a | Issue Tracking Patch Vendor Advisory |
| https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 | Issue Tracking Patch Vendor Advisory |
| https://security.netapp.com/advisory/ntap-20201001-0003/ | Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2020/09/08/4 | Mailing List Patch Third Party Advisory |