原文の説明
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is intentional: at the bridge ebtables hooks the Ethernet header is addressed through skb_mac_header()/eth_hdr(), while skb->data points at the Ethernet payload. Asking skb_ensure_writable() for ETH_HLEN bytes would check the payload, not the Ethernet header, and would reintroduce the small packet regression fixed by commit 63137bc5882a. However, the optional ARP sender hardware address rewrite is different. It writes through skb_store_bits() at an offset relative to skb->data: skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN) skb_header_pointer() only safely reads the ARP header; it does not make the later sender hardware address range writable. If that range is still held in a nonlinear skb fragment backed by a splice-imported file page, skb_store_bits() maps the frag page and copies the new MAC address directly into it. Ensure the ARP SHA range is writable before reading the ARP header and before calling skb_store_bits().
悪用確認済み（CISA KEV）
- KEV 追加日
- 2026-09-18
- 対応期限（米連邦機関）
- 2026-09-21
- ランサムウェアでの使用
- Unknown
- 必要な対応
- 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.
詳細
- 公開日
- 2026-06-25
- 最終更新
- 2026-09-19
- CVSS ベクター
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H- EPSS（30日以内の悪用確率）
- 0.93% (パーセンタイル 61)
参考資料
- cve.org/CVE-2026-53266
- nvd.nist.gov/vuln/detail/CVE-2026-53266
- git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87
- git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b
- git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0
- git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b
- git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093
- git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d
- git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5
- git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49
本製品は NVD API のデータを使用していますが、NVD による承認または認定を受けたものではありません。CVE® は The MITRE Corporation の登録商標です。CVE レコードは CVE Program の利用規約に基づいて使用しています。