GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.
総合評価: CVE-2020-15706 は中リスク（46.6/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.98%、57 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 | 0.04% | 0.98% | +0.93% |
| 2 | 2026-06-10 | 0.06% | 0.04% | -0.02% |
| 3 | 2025-11-21 | — | 0.06% | — |
EPSS の全履歴 （全 12 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 |
|---|---|---|---|---|---|---|
| 6.4 | 3.1 | MEDIUM |
|
0.5 | 5.9 | [email protected] |
| 6.4 | 3.1 | MEDIUM |
|
0.5 | 5.9 | [email protected] |
| 4.4 | 2.0 | MEDIUM |
|
3.4 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2020-15706: 1 source package rows (grub); 7 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 0. | https://security.alpinelinux.org/vuln/CVE-2020-15706 |
debian
|
not yet assigned | CVE-2020-15706 not yet assigned priority: Debian including 1 source packages (grub2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2020-15706 |
gentoo
|
normal | CVE-2020-15706: 1 GLSA(s) (202104-05), 1 atom(s) (sys-devel/grub); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-15706 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2020-15706 |
suse
|
medium | CVE-2020-15706 severity moderate: SUSE including 440 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 672 product×package rows across 77 product lines (HPE Helion OpenStack 8, Image SLES12-SP5-Azure-BYOS, … (77 product lines)): Fixed 515, Known Affected 157. | https://www.suse.com/security/cve/CVE-2020-15706/ |
ubuntu
|
high | CVE-2020-15706 high priority: Ubuntu including 3 source packages (grub2, grub2-signed, grub2-unsigned), 43 status rows across 15 suites (bionic, focal, groovy, hirsute, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 30, released 8, needs-triage 3, DNE 1, needed 1. | https://ubuntu.com/security/CVE-2020-15706 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| gnu | grub2 | <= 2.04 | cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* |
| redhat | enterprise_linux_atomic_host | — | cpe:2.3:a:redhat:enterprise_linux_atomic_host:-:*:*:*:*:*:*:* |
| redhat | openshift_container_platform | 4.0 | cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 14.04 | cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* |
| canonical | ubuntu_linux | 16.04 | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 18.04 | cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 20.04 | cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 7.0 | cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 8.0 | cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* |
| suse | suse_linux_enterprise_server | 11 | cpe:2.3:o:suse:suse_linux_enterprise_server:11:*:*:*:*:*:*:* |
| suse | suse_linux_enterprise_server | 12 | cpe:2.3:o:suse:suse_linux_enterprise_server:12:*:*:*:*:*:*:* |
| suse | suse_linux_enterprise_server | 15 | cpe:2.3:o:suse:suse_linux_enterprise_server:15:*:*:*:*:*:*:* |
| microsoft | windows_10 | — | cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* |
| microsoft | windows_10 | 1607 | cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* |
| microsoft | windows_10 | 1709 | cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* |
| microsoft | windows_10 | 1803 | cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* |
| microsoft | windows_10 | 1809 | cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* |
| microsoft | windows_10 | 1903 | cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* |
| microsoft | windows_10 | 1909 | cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* |
| microsoft | windows_10 | 2004 | cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:* |
| microsoft | windows_8.1 | — | cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* |
| microsoft | windows_rt_8.1 | — | cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* |
| microsoft | windows_server_2012 | — | cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* |
| microsoft | windows_server_2012 | r2 | cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 | — | cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 | 1903 | cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 | 1909 | cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 | 2004 | cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:* |
| microsoft | windows_server_2019 | — | cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* |
| opensuse | leap | 15.1 | cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* |
| opensuse | leap | 15.2 | cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 16.04 | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* |