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 D3037446BE0 for ; Wed, 26 Aug 2026 14:41:29 +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=1787755292; cv=none; b=I5gu/2LYdI2vAnQHc9yQUKFODQyVLQpF6h7T20PQkbQ1dM15JjIpDOyU8nJvsGmJVgvx3tMaek6pyZW0TksWkEzJxr8iSGYPD31Updjll4RifSEYgfSX/IqZxiB5qB/rKkOXO/9RnJuWJ64IN1NSlka4xZzSPWgnZBl0PcQemzA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787755292; c=relaxed/simple; bh=/d56jN2UQtS/hynFBVUESj3tEcC4OnvsR4khsn5Ivho=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=F4GPqj4CCrSdop8uzG5T50BJdc6Ux3W45ZmjopElFhkCoPU+xDH8hCVGTXvOctqH0/edvYoQWlT53+sJ1g3CbRmBWdtUxvqCORR4Yu9xNJKY0Krdfe4YRzWmiYFv4Zx2PqdrBMyHU5bW9pWN3ytRcxb5mgdskOPdLXLSAVM27po= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xFJkR/EX; 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="xFJkR/EX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C2501F000E9; Wed, 26 Aug 2026 14:41:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787755289; bh=IzwLGtMFzYdvnuQaKFYmeWyCuGsYTr8S0rbT/rzN7/M=; h=From:To:Cc:Subject:Date:Reply-To; b=xFJkR/EXLVL8xN0DaeUo4/KzMkqCSKOib9aXYgXDxE9hSLg7X8OFCS0BEzKP7mRSD GbEgnodfm+bbDEVpFneW1J0cvdIXnoUtt4oliE20ZPDlmXiiUwLmc3owc7Sb7+k452 9Bm5MRao+w94UY8s5IB+0Rr/rLeSftEUPaD+m5sY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80584: s390/qeth: validate user buffer length in SNMP and ARP query ioctls Date: Wed, 26 Aug 2026 16:38:20 +0200 Message-ID: <2026082616-CVE-2026-80584-5dae@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=3915; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=AMWXW/Pjmr93fEjzkgPcRMdP+5zq27drxrKoKn2mEv4=; b=owGbwMvMwCRo6H6F97bub03G02pJDFl9v2TuNemk9t+8ecPnzYZrR4yWz9vUY5syscjuza3tP unLd1hu7ohlYRBkYpAVU2T5so3n6P6KQ4pehranYeawMoEMYeDiFICJZKowLLj4U+3QgWWxtfOZ 12XtNErmmJJ6MpZhwQm/3SpFju85Hs6S28f3x3rVTJ7ntwE= 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: s390/qeth: validate user buffer length in SNMP and ARP query ioctls qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by a user-supplied length (udata_len) without checking a lower bound, then set udata_offset to a fixed non-zero value and pass both to a reply callback. The callback bounds-checks the copy with if ((udata_len - udata_offset) < len) Both fields are u32, so a udata_len smaller than udata_offset makes the subtraction wrap and the check pass, and the following memcpy() writes past the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from kzalloc(), which the existing NULL check does not catch. Reject buffers smaller than udata_offset before allocating, so the callback subtraction can no longer underflow. The Linux kernel CVE team has assigned CVE-2026-80584 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 5.10.266 with commit 9d00eeb2d27f4cc817c5e408760226d43f811ec6 Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 5.15.217 with commit 46443eaddebd84c51940857b11787229be169dec Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 6.1.184 with commit 91935843f9396a9e45253e2c0d4337ca1371754b Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 6.6.153 with commit cc423f4105fe145b33e1d7cad34245a798358f73 Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 6.12.105 with commit 3083818e67bcd656965797fbac9a3d6c1d44f78a Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 6.18.46 with commit a3083647747942ea32faf14560d6397ff3068046 Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 7.1.10 with commit 75fb3151513d7d9f77a8f9545418279b119c06b8 Issue introduced in 2.6.26 with commit 4a71df50047f0db65ea09b1be155852e81a45eba and fixed in 7.2 with commit d141f087b1af656f055d7c5793a3e87817ba0bbe 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-2026-80584 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/s390/net/qeth_core_main.c drivers/s390/net/qeth_l3_main.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/9d00eeb2d27f4cc817c5e408760226d43f811ec6 https://git.kernel.org/stable/c/46443eaddebd84c51940857b11787229be169dec https://git.kernel.org/stable/c/91935843f9396a9e45253e2c0d4337ca1371754b https://git.kernel.org/stable/c/cc423f4105fe145b33e1d7cad34245a798358f73 https://git.kernel.org/stable/c/3083818e67bcd656965797fbac9a3d6c1d44f78a https://git.kernel.org/stable/c/a3083647747942ea32faf14560d6397ff3068046 https://git.kernel.org/stable/c/75fb3151513d7d9f77a8f9545418279b119c06b8 https://git.kernel.org/stable/c/d141f087b1af656f055d7c5793a3e87817ba0bbe