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 B006B3B4EB7 for ; Fri, 4 Sep 2026 17:13:40 +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=1788542021; cv=none; b=A1pgBhr94TE8UWiOaEDhZiFuFQhojo1qBUwkZ0nbisj0Oa0NAtS+qRjroi49JtTRz8aH1mspzv+QqwWdHU6QAvuyxGSkzUu/b7iB9AS6PtF5RkSICmYD6XnxdXrGz6eidYgxeAhx3JVNUSpfd8kruCJUtgw9BARZGQWVl+B8NY8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788542021; c=relaxed/simple; bh=Osk66LPkPy4jfscnu8SsRx2TIKC96jQF4cxg6ou5Cv4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=AuTM4WMRl3viW0YI5ScGSTD9ynEl+pfbZ4ZfoDChKM6K+HtdKILpMs5gb4oCIrlXhVW3wEgq7oo0YaJYHMoSSm6tywBTXR6oEAktWGzHH0ejQkwfxwqrXXzsVj0G4MbtPTjRHUkdyYx8VZVpJt3x6Vx5eFWYpUeOqYq+1G7rDa8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PhFxPov6; 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="PhFxPov6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB58C1F00A3D; Fri, 4 Sep 2026 17:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788542020; bh=IWczXpcZRZ5G+RfXaH9oqjqlbNW+T4vKZDHFhXQIkdo=; h=From:To:Cc:Subject:Date:Reply-To; b=PhFxPov6b83F/yRb7zMDASFDth8PsFqX22T15XACznKAJ+p8FwlILRmUnw/rl5RQw EErzlyuwX5UfxOUpvw64KqXMSAa4Dtd/KPBiN9cq8uOFKoeHMyjNhwpxqUzzg+Rmhn Amg+AVn4AjfEgRb7fMkcLFBtHYceav77Whjb+5dQ= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80901: ipvs: fix the checksum validations Date: Fri, 4 Sep 2026 19:09:42 +0200 Message-ID: <2026090431-CVE-2026-80901-3ce1@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=3868; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=WACzRPbHiZhX1mTshDfoebUEwt0Yyp/qoLtnF29dZvw=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmzfnv/lC8tli3IWMbK3/Gu8/36+qCZT5UvfE9gPfHa5 9/GpRO/dsSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEfjExzPdsEWq4JnK+wYWl +h1viF6uTvtORYZ59pnfjnoqTOf78YJ/2/RtWpvN7zB2AwA= 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: ipvs: fix the checksum validations ip_vs_in_icmp_v6() is missing checksum validation for ICMPv6 packets from clients. In fact, as for TCP/UDP we should validate the checksum for ICMP packets only when we mangle the packets on MASQ or on reply for tunnel. Also, Sashiko points out that handle_response_icmp() being common for IPv4 and IPv6 is missing the pseudo-header calculation while validating ICMPv6 messages from real servers which is a problem if checksum is not validated by the hardware. Fix the problems by creating ip_vs_checksum_common_check() helper and use it for TCP/UDP/ICMP both for IPv4 and IPv6. Rely on the nf_checksum() for validating the ICMP messages but use it also for TCP and UDP. Use correct IP offset for IP_VS_DBG_RL_PKT for TCP/UDP/SCTP. IPVS packets (TCP/UDP/SCTP/ICMP) do not need checksum validation on LOCAL_OUT (local clients or local real servers) and on FORWARD (traffic from servers on LAN). Do it only on LOCAL_IN, in case nf_checksum() is not called on PRE_ROUTING. Also, ip_vs_checksum_complete() can be marked static. The Linux kernel CVE team has assigned CVE-2026-80901 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.1.183 with commit d418d73acf8be62744dc47359dfdde8c2148845d Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.6.151 with commit b3869d9b54e76dff64118dee4c8fd9302fcd5171 Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.12.103 with commit 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0 Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.18.44 with commit 00eb23829fd08df1b5e057cb6b625996a70e7e65 Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 7.1.8 with commit 5558a85add073215b298f3e044ff9a6d86d714ae Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 7.2 with commit e876b75b9020a97bbdc79721e7fc749024891c65 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-2026-80901 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: include/net/ip_vs.h net/netfilter/ipvs/ip_vs_core.c net/netfilter/ipvs/ip_vs_proto_sctp.c net/netfilter/ipvs/ip_vs_proto_tcp.c net/netfilter/ipvs/ip_vs_proto_udp.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/d418d73acf8be62744dc47359dfdde8c2148845d https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171 https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0 https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65 https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65