From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B8683C09E5 for ; Sat, 22 Aug 2026 15:39:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787413151; cv=none; b=moI8aPlTv2UdGKP9sZ6ueHGWaZHyA1d+E8gFKb/nSph9HUD5cn6c1FNQKTkNmPKNUqgZ5OQJeuP3vGsiI1sxObK/QGvceZzqhIZLSXt9CahgoSiXIUOO8OF3w5qA9LdwlUuNYoPGuwFOMqkYbKhht6MtqW0IL11tmPvczNHJMV8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787413151; c=relaxed/simple; bh=3jfHIlbRdtmCXamCn0LTUQiKNS5jgsjAXuXKIckXgBs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=q7Bosv3RGguULWhV9PDSWCPlyMYVWoYY60zAwSTf2UfU2qy2K7z6JgkZVUFoEGgOEl5w2L7eLfgD0KRi84bVwLXeDCrvvILPGdieXo2ty6cCRlN7a/pcEG2Tt4v0GIIzAvvramStYNPGzHvUcxN9y17nXbaOXFAoSRufLD2Nwdg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DH1yvKh7; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="DH1yvKh7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C9EF1F000E9; Sat, 22 Aug 2026 15:39:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787413149; bh=gUeXlxn25VUeUA12pwNVuTmkGtDBhHcdW8UV6CYVY0c=; h=From:To:Cc:Subject:Date:Reply-To; b=DH1yvKh7tZYwnG/Be+Oy2FVYZz0fhD1YjBZUjKtwHTLJ8du2QHuyOKZMqUSTsv8zC 2KVfHZcrOuTeCkJcu5fGybni6vt6BYtj5Yoy9ZN6Axh/zoJrWxVZtBLcQ6bSu8jysa m2MshEiqEJV78lUe4bxudTpShozzD8kUpN5nGhzo= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74701: net/openvswitch: check Ethernet header length in key_extract() Date: Sat, 22 Aug 2026 17:33:05 +0200 Message-ID: <2026082235-CVE-2026-74701-282b@gregkh> X-Mailer: git-send-email 2.55.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3969; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=N9LtpXXDKX0R1QeNjmxXoZaidPUS12bEEQ+lsX6zWzg=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmdB26wH1L3u3xSqrPqzbLMvqpLuxcXS9hOazomc2Lfi 9xZ6076dcSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEAh0YFpxMWRoXynRwKsNd d48dUYeNPbvq+xjm5788OdH9Zk2b7Ur73HtZGydeXO++HgA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: net/openvswitch: check Ethernet header length in key_extract() When a packet arrives on an ARPHRD_NONE device (e.g. TUN), ovs_flow_key_extract() trusts the user-provided skb->protocol field: if it is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and key_extract() is called without ensuring the skb has ETH_HLEN (14) bytes of linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes for MAC addresses and parse_ethertype() pulls 2 more, either of which triggers a kernel BUG in __skb_pull() when the linear area is too small. kernel BUG at include/linux/skbuff.h:2848! RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933 ovs_flow_key_extract+0x419/0xa70 ovs_vport_receive+0x222/0x390 netdev_frame_hook+0x3e0/0x630 tun_get_user+0x2d0c/0x38e0 Fixed by calling check_header() in key_extract() before accessing the Ethernet header. The Linux kernel CVE team has assigned CVE-2026-74701 to this issue. Affected and fixed versions =========================== Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 5.10.265 with commit e85278afd4890dd190ba3c7a1b1a712b801c9fe1 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 5.15.216 with commit 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 6.1.183 with commit 831471718f6e19aed1a330b03b53190a90e06466 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 6.6.152 with commit d8bea341b183190ce6c055ab0e64ab78eb9a7290 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 6.12.104 with commit 0b60b55652ba772b173dddc63f3851e1d2dd5927 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 6.18.45 with commit a8139285c8925efe59af28a9169bb2fda91bff15 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 7.1.9 with commit 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 Issue introduced in 4.10 with commit 217ac77a3c2524d999730b2a80b61fcc2d0f734a and fixed in 7.2 with commit cf6f8b29befb92173659bcef6a441d274947bfae Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-74701 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/openvswitch/flow.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1 https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466 https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290 https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927 https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15 https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae