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 074E03815D0 for ; Thu, 25 Jun 2026 08:43:14 +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=1782376995; cv=none; b=dZ7IB9jRU9jOSAbLEWrT9EXR8nmcwaCXlXbqDPy0cyttgpFx34pQHth0M7GT/RyjByosFue7mamCePUjC6DgfKwxtMEJIwDM5eFdm7A0+Sd18SX3FsB5dP0sc34Cb9SMqO5BRwbqhnzPKnUsdN9WKnFsWis6VzMqPZRxVUbVqUs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782376995; c=relaxed/simple; bh=pTn/DsH0IsFs7Cz6qj058XIQLm37nLc9SKVqarQ2s3g=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=hI1AJAH+ygP+WpWn8XcbmPyp3ggwscHHMSJp87FH9zgvMNrdubjujX1DmtSQHAOWr8BrbBhptx7vGzYRYEzaRLKnGgdjNF1IRzuJJAAm/lXBDmp97hQyPEvpJik4Tns0OfolFEFPu/3++nBwM+DN3nlMzv0LuW1iccF3yjMz3XU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NUJZIcIM; 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="NUJZIcIM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C9911F000E9; Thu, 25 Jun 2026 08:43:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1782376993; bh=W0jFAONWCDWfaOyB/M0hiH9lLauIXLIncMiBjEaYlEM=; h=From:To:Cc:Subject:Date:Reply-To; b=NUJZIcIM3o0XgfP7cYGs3MeDNd2zR3NSKt4Uf1GM7ZHtxZTtYjWbAni0RJT9JD/cV kfnY4X0JumFmauR8qPOy192de2iSI+3t0PBG5+Y3h4MCeJu28EYNoFCT/peBMkXPq7 4DNjSwhI9yJnF1Y3yF7yIKYjLAytAy2iEkNR11kM= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-53137: drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size Date: Thu, 25 Jun 2026 09:39:45 +0100 Message-ID: <2026062543-CVE-2026-53137-e711@gregkh> X-Mailer: git-send-email 2.54.0 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=3831; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=BajxdUEHELc5RWLjeW+M8sLGst0HoKnTdVyLBQwsZoI=; b=owGbwMvMwCRo6H6F97bub03G02pJDFk2L/0v7Xs2yzpWYdtJh0Mrp0q03mWb3tA181vgwkMry jk6Mo2WdMSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEPn9hmJ92ukRt+n4N8aNm 3iydaXGBSiXMjQxz+NVfS23tZpq1nlG48fTWKx+5JB+GAgA= 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: drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size [Why & How] During HDCP 2.x repeater authentication over HDMI, the driver reads the sink's RxStatus register and extracts a 10-bit message size field (max value 1023). This value is used as the read length for the ReceiverID list without being clamped to the size of the destination buffer rx_id_list[177]. A malicious HDMI repeater could advertise a message size larger than the buffer, causing an out-of-bounds write during the I2C read. Clamp the read length in mod_hdcp_read_rx_id_list() to the size of the rx_id_list buffer, matching the approach already used in the DP branch. (cherry picked from commit 229212219e4247d9486f8ba41ef087358490be09) The Linux kernel CVE team has assigned CVE-2026-53137 to this issue. Affected and fixed versions =========================== Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 5.10.259 with commit 3c4444aec06c74fbc05661f370954ac814963c38 Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 5.15.210 with commit 91fb41218c413989d8b6c837748751454b452d68 Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 6.1.176 with commit 964e50ef7b8f09815a7d05b8326af700f8d5bc96 Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 6.6.143 with commit 79e0273272a05fb26f9b1e55bf1a52eefc3b7b35 Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 6.12.94 with commit bfba882cfcd08f6540f72f48e786b6404f5d2c5b Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 6.18.36 with commit 1906064d50d194a145486e5caf3db3e708b6f6ef Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 7.0.13 with commit 98cfb7530ea91d8e5e928285cdce58e1131f6e83 Issue introduced in 5.6 with commit eff682f83c9c2030761e7536c5d97e1b20f71c15 and fixed in 7.1 with commit f0f3981c43b32cadfe373d636d9e9ca522bb3702 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-2026-53137 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/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.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/3c4444aec06c74fbc05661f370954ac814963c38 https://git.kernel.org/stable/c/91fb41218c413989d8b6c837748751454b452d68 https://git.kernel.org/stable/c/964e50ef7b8f09815a7d05b8326af700f8d5bc96 https://git.kernel.org/stable/c/79e0273272a05fb26f9b1e55bf1a52eefc3b7b35 https://git.kernel.org/stable/c/bfba882cfcd08f6540f72f48e786b6404f5d2c5b https://git.kernel.org/stable/c/1906064d50d194a145486e5caf3db3e708b6f6ef https://git.kernel.org/stable/c/98cfb7530ea91d8e5e928285cdce58e1131f6e83 https://git.kernel.org/stable/c/f0f3981c43b32cadfe373d636d9e9ca522bb3702