In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability.
総合評価: CVE-2021-26342 は低リスク（17.5/100）。CVSS 深刻度は低。悪用される可能性が高い（EPSS 0.21%、12 パーセンタイル） 推奨対応: 総合リスクは低く緊急対応は不要です。通常の保守サイクルでパッチを適用し、CVSS / EPSS が上昇したら優先度を見直してください。
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 | 0.06% | 0.21% | +0.16% |
| 2 | 2025-03-30 | 0.04% | 0.06% | +0.01% |
| 3 | 2025-03-29 | — | 0.04% | — |
EPSS の全履歴 （全 6 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 |
|---|---|---|---|---|---|---|
| 3.3 | 3.1 | LOW |
|
1.8 | 1.4 | [email protected] |
| 2.1 | 2.0 | LOW |
|
3.9 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
suse
|
medium | CVE-2021-26342 severity moderate: SUSE including 436 source package names (kernel-firmware, kernel-firmware-20170530-21.34.1, …), 756 product×package rows across 60 product lines (Container rancher/elemental-teal-rt/5.3, Container rancher/elemental-teal-rt/5.4, … (60 product lines)): Fixed 755, Known Not Affected 1. | https://www.suse.com/security/cve/CVE-2021-26342/ |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| amd | epyc_7763_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7763_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7713p_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7713p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7713_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7713_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7663_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7663_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7643_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7643_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_75f3_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7543p_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7543_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7513_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7453_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_74f3_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7443p_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7443_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7413_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_73f3_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7343_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7313p_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7313_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_72f3_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7773x_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7773x_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7473x_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7473x_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7573x_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7573x_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7373x_firmware | < milanpi-sp3_1.0.0.7 | cpe:2.3:o:amd:epyc_7373x_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7001_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7001_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7251_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7251_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7261_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7261_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7281_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7281_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7301_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7301_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7351_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7351_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7351p_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7351p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7371_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7371_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7401_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7401_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7401p_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7401p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7451_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7451_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7501_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7501_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7551_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7551_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7551p_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7551p_firmware:*:*:*:*:*:*:*:* |
| amd | epyc_7601_firmware | < naplespi-sp3_1.0.0.h | cpe:2.3:o:amd:epyc_7601_firmware:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028 | Vendor Advisory |