CVE-2025-39964（linux linux kernel）の深刻度・悪用状況・対象バージョン
5.5 警告（CVSS 3.x） 悪用確認済み（CISA KEV） EPSS 取得中…
概要
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.
実際の攻撃で悪用されています。 CISA KEV への追加日: 2026-09-18。対象製品を使っている場合は最優先で対策してください。
CISA の要求対応: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA の要求対応: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| linux | linux_kernel | ≥ 2.6.38 かつ < 5.10.245 |
| linux | linux_kernel | ≥ 5.11 かつ < 5.15.194 |
| linux | linux_kernel | ≥ 5.16 かつ < 6.1.154 |
| linux | linux_kernel | ≥ 6.2 かつ < 6.6.108 |
| linux | linux_kernel | ≥ 6.7 かつ < 6.12.49 |
| linux | linux_kernel | ≥ 6.13 かつ < 6.16.9 |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | 6.17 |
| siemens | simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware | ≥ 3.1.6 |
| siemens | simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware | ≥ 3.1.6 |
基本情報
- 公開日
- 2025-10-13
- 最終更新
- 2026-10-19
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-362
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2025-39964 を検索 できます。
参考情報
- https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce Patch
- https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 Patch
- https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 Patch
- https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042 Patch
- https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84 Patch
- https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d Patch
- https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9 Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39964 US Government Resource
- NVD: CVE-2025-39964
- CVE.org: CVE-2025-39964
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。