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 726AB3C98AF for ; Mon, 10 Aug 2026 12:03:09 +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=1786363390; cv=none; b=K9oIc9LkJaZA5Oeb6zBuIEtMS6nsGbtSFC4hNYUGkKCeHovKlE8nkM3qvC8p8vjia8nSc7Olu9K0rRmdHmN3sp2zztOua/6AW+km7u65AeNK/i8/9c/GBToPOam+WfrtQvVOhEvx/ONy0Kn/dDlGPBFHdf5gxucXBIub12jlxPo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786363390; c=relaxed/simple; bh=rEoDfCfK1QnK+fXL7/9HsE9lSd/sgb3ZPctDkQKlRq0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=eK69Hm4QWZ453eGcCu/+PlpR7KGfLmIQlCLwViC+pQdKNz7yHtxNGRNKnzLl8unMEe0Sqo9cLENRCq2VZX8TeE6kYaM8gSJOFewhZ2R3DMgHXjprKXIiDmxPigsYGjvX2JRUfJ6ygKNIKA8c8t5jHV5ExF4ebDpMkdeUOMXzkVA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=XJaOb9gO; 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="XJaOb9gO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EAB511F000E9; Mon, 10 Aug 2026 12:03:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786363389; bh=1nAPYmOW5+JBwMKjvGToT+1Jc6SDK6lyc0QiYFb+qT8=; h=From:To:Cc:Subject:Date:Reply-To; b=XJaOb9gOQ9xWp9ekDy647wu9LIaFGPjvxRJWGH3h5+K0t3ctA+fWHAFTqU0kB4l20 nhsVpDTfkQElQ3akGo5hm+AJoAtCKeNBBAOFqR5I0dVWn7A63uZ8429dORFOTIYzA+ HoAq5lMnJlxE5Lo4rsTXaeWPVH0zCNQQpJDkK8rk= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-68142: geneve: require CAP_NET_ADMIN in the device netns for changelink Date: Mon, 10 Aug 2026 13:57:39 +0200 Message-ID: <2026081000-CVE-2026-68142-3fc3@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=3464; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=jEVtLimXy9O9bqRmGTdX01vD25boJQ/q17QFIJtmUrE=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmVe3oOdm3K9rQ0irr9K/54JY+P6I5NIm2Nq/yztjnVd mm4Z7h1xLIwCDIxyIopsnzZxnN0f8UhRS9D29Mwc1iZQIYwcHEKwESaXzDMYpaScAk7vyj9Adf2 cpv85VufNzQyMyzY/IXt+b6vu93fXFhmsvwcw/YHPCt8AA== 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: geneve: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns geneve->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in geneve->net can rewrite a geneve device whose underlay lives in geneve->net. geneve_changelink() applies the new configuration against geneve->net: geneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair reopen the underlay sockets in that netns (geneve_sock_add() uses geneve->net), so the same reasoning as the tunnel changelink series applies here. Gate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai). The Linux kernel CVE team has assigned CVE-2026-68142 to this issue. Affected and fixed versions =========================== Issue introduced in 4.14 with commit 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a and fixed in 6.6.148 with commit 2abdacc927c92fa6a9cc8341e8c9b88dcb561553 Issue introduced in 4.14 with commit 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a and fixed in 6.12.101 with commit 9de5518fc1fab583526a8f66b8e505c4864dc60a Issue introduced in 4.14 with commit 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a and fixed in 6.18.42 with commit f8c498585d2a08aa623748353c3e61467b7e9fd2 Issue introduced in 4.14 with commit 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a and fixed in 7.1.6 with commit 95f45e20f1b2cec13823f0f68060ab4b2261b2c1 Issue introduced in 4.14 with commit 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a and fixed in 7.2-rc5 with commit 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01 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-2026-68142 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: drivers/net/geneve.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/2abdacc927c92fa6a9cc8341e8c9b88dcb561553 https://git.kernel.org/stable/c/9de5518fc1fab583526a8f66b8e505c4864dc60a https://git.kernel.org/stable/c/f8c498585d2a08aa623748353c3e61467b7e9fd2 https://git.kernel.org/stable/c/95f45e20f1b2cec13823f0f68060ab4b2261b2c1 https://git.kernel.org/stable/c/8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01