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 5D2A0367283 for ; Sat, 15 Aug 2026 06:18:30 +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=1786774711; cv=none; b=jRrcA3+NgG53ZjuQvJF3g2QG7zB/mhF5zyQqyVn/8IjqUBXCjy7D/Cs5Cycr7565HTwUTbwigl/RTZl3PpPfb1LslVKP2xx0Pxi23nOx4aK7OIPKFsM68cn+OgQENFUOu9b49Te4TfoMnKG/OfkFX7vec3FI5G1J937350vIK9Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786774711; c=relaxed/simple; bh=i75dqUyXeHeP4fu7YoRF+MHHRJiOFvF8PhYGsI8InEM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=okb1p3giQLcWfj7nUiOYF03TPCFXje3ji9o6hPGYSNc3e7aQ9uFd3y+KzZEzge7ClFN6N56PgW0UNJw208uh96NOY/EVxGfvCsiobyoiAdgr9OXRcdl5aV/k7JYQWVtNFXeD2mYSk++jG8hhd4/M7eapDWJeCAND37qNpYRRGHI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xMiP2wGy; 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="xMiP2wGy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C0DF1F000E9; Sat, 15 Aug 2026 06:18:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786774710; bh=g401GBE2fmkpDh/1rtd1mHHIHgKQ93ic/X3pjywXcBE=; h=From:To:Cc:Subject:Date:Reply-To; b=xMiP2wGy9NiHcmowkFpRFPOpreVKPYZFBin5M4wI4w623wzWRH8T2ELO0nqlZ+Umb Lixh11xc9f0Y+12Va3KlBAz0G3YlpTjk/JEMWscYYm21IQJssOlnUcahsmOq7X0oY9 oo6H5wlhLIMWjv99zr0wcwyF5eL3u6Kh+wScc+lU= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72246: netfilter: flowtable: use correct direction to set up tunnel route Date: Sat, 15 Aug 2026 15:05:25 +0900 Message-ID: <2026081552-CVE-2026-72246-63e0@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=2261; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=+AKIW++En2X8ab/JqaIQ05IfpPlRtvAEkPMnIsF9adI=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDBcmVHln97XNn3pwysdX/SxZ9fVmXa//Jk7bdzj/l OmsrjWRHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRj1MYFlzrCgo0DZ/GdeiB +qanC2zOL/1ZocswPzSId3mCUthb3ZpFO98ssv575+ApIwA= 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: netfilter: flowtable: use correct direction to set up tunnel route The layer 2 encapsulation and layer 3 tunnel information in the xmit path is taken from the other tuple, because the tunnel information that is included in the tuple for hashtable lookups is also used to perform the egress encapsulation in the transmit path. This patch uses the correct direction when setting up the tunnel, the original proposed patch to address this fix uses the reversed direction. While at it, remove the redundant check to call dst_release() to drop the reference on the dst that was obtained from the forward path, which is not useful in the direct xmit path unless tunneling is performed. The Linux kernel CVE team has assigned CVE-2026-72246 to this issue. Affected and fixed versions =========================== Issue introduced in 7.2-rc3 with commit fa7395c02d95e51bad2952325d2d6503bfbad437 and fixed in 7.2-rc4 with commit 90941d9c925d66a482c9121919ec3546a6988c16 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-2026-72246 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/netfilter/nf_flow_table_core.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/392d033fd372268015bc5a54ba7c593ba44940d1 https://git.kernel.org/stable/c/90941d9c925d66a482c9121919ec3546a6988c16