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 D714B4052A5 for ; Fri, 4 Sep 2026 15:55:46 +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=1788537348; cv=none; b=RXh6fo5A11ir+Q8ftT9v/G+TXh6MDruZR6rWtgkeY5D/zo0jVanCiMYl+nzjA/DfRs9uWtfvlwgt+Iqq1oqpFhKaXiFg631xMu8ktlJZKpMN7oivvbhi/nagdNaWQmeDY4RmVcpiIZIvUtaSNqMEsiRN5Sy8s4xFNjY3VbClbOY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788537348; c=relaxed/simple; bh=tgrCiNddy2+UcRB8Q1FJJwS9sAH1lMInOtePdNs/+S4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=R5uKWeIH8Nrg3VJsVhAcQZgc7MTgKh2VKMtlpZH0xX8i8SdBbyckFrFXy7cygIYN93U+LUJYUlIJduYMsov7edpTTQW0oN7dFm2iHm2GI9Fy6WdidO5iV6gxSH7o+78jovPyt2/IIEErdNza1ipEKe3qKBWokT/H5dppa+oXKxY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sB3YFNTf; 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="sB3YFNTf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D8351F00A3D; Fri, 4 Sep 2026 15:55:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788537346; bh=+f7rEpFWAQq2vTLQPqbZT4HJidM5guFi9NVYi9OLgzg=; h=From:To:Cc:Subject:Date:Reply-To; b=sB3YFNTfpm3eoT422WaNkuMY8ytFIB/wLB2eZONU3Ihh1phMIPVKulMzSCXnXqTfH qj8WLkNWPG4NJ/G3NC8gXdei7MV+88CCU0C1ZkF1AAoLy1QdTiGsAa+X/t28wJ6MPp pAXtiTJE1DhymTeKlriqvdB1CtsMSsarF8+05GKc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80836: crypto: virtio - bound the akcipher result length Date: Fri, 4 Sep 2026 17:53:03 +0200 Message-ID: <2026090457-CVE-2026-80836-9774@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=2811; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=kpTDl277p3UsnCnVErJfQ7p3WDGqvuyETz6b5nMbV5g=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmzXkZucz9wkt/fXYv5zS2e9I05vJdnTOTNbWn5efTz/ TV7JHYndcSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEZuQxzC9JynD/vj5CU+vw RF3Z/TdebJrisZ9hnubiZK7oRN8jlw5eiS/+faDw5tv7nwA= 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: crypto: virtio - bound the akcipher result length virtio_crypto_dataq_akcipher_callback() sets the result length from the device-reported response length without bounding it to the destination buffer, which was allocated for the original request length. sg_copy_from_buffer() then reads that many bytes from the destination buffer; a backend reporting a larger length over-reads adjacent kernel heap into the caller's scatterlist (an out-of-bounds read). Clamp the reported length to the originally requested destination length. A conforming device reports no more than that, so valid results are unaffected. The Linux kernel CVE team has assigned CVE-2026-80836 to this issue. Affected and fixed versions =========================== Issue introduced in 5.19 with commit a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a and fixed in 6.18.49 with commit 5545de5050cbc3594506d74f2c392b0716cf8bca Issue introduced in 5.19 with commit a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a and fixed in 7.1.13 with commit 3fda114a42f1510a4ec8a0b17a0cfc997952ccc2 Issue introduced in 5.19 with commit a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a and fixed in 7.2.3 with commit 1f9f877b1ef1fbd4ee95571cddf39c8002cee252 Issue introduced in 5.19 with commit a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a and fixed in 7.3-rc1 with commit f77a956f6a19f9463ef1527c9d0cda50dded6b92 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-2026-80836 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/crypto/virtio/virtio_crypto_akcipher_algs.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/5545de5050cbc3594506d74f2c392b0716cf8bca https://git.kernel.org/stable/c/3fda114a42f1510a4ec8a0b17a0cfc997952ccc2 https://git.kernel.org/stable/c/1f9f877b1ef1fbd4ee95571cddf39c8002cee252 https://git.kernel.org/stable/c/f77a956f6a19f9463ef1527c9d0cda50dded6b92