CVE-2026-46300（linux linux kernel）の深刻度・悪用状況・対象バージョン
概要
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
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 | ≥ 3.9 かつ ≤ 5.10.257 |
| linux | linux_kernel | ≥ 5.11 かつ < 5.15.208 |
| linux | linux_kernel | ≥ 5.16 かつ < 6.1.174 |
| linux | linux_kernel | ≥ 6.2 かつ < 6.6.141 |
| linux | linux_kernel | ≥ 6.7 かつ < 6.12.91 |
| linux | linux_kernel | ≥ 6.13 かつ < 6.18.33 |
| linux | linux_kernel | ≥ 6.19 かつ < 7.0.10 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| siemens | simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware | ≥ 3.1.5 かつ ≤ 3.1.6 |
| redhat | openshift_container_platform | ≥ 4.12 かつ < 4.12.91 |
| redhat | openshift_container_platform | ≥ 4.13 かつ < 4.13.67 |
| redhat | openshift_container_platform | ≥ 4.14 かつ < 4.14.68 |
基本情報
- 公開日
- 2026-05-23
- 最終更新
- 2026-10-29
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-787 CWE-456 CWE-123
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-2026-46300 を検索 できます。
参考情報
- https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c Patch
- https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 Patch
- https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 Patch
- https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a Patch
- https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e Patch
- https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 Patch
- https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 Patch
- https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 Patch
- http://www.openwall.com/lists/oss-security/2026/05/13/5 Mailing List
- http://www.openwall.com/lists/oss-security/2026/05/21/11 Mailing List
- http://www.openwall.com/lists/oss-security/2026/05/21/12 Mailing List
- http://www.openwall.com/lists/oss-security/2026/05/21/13 Mailing List
- NVD: CVE-2026-46300
- CVE.org: CVE-2026-46300
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。