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 7C26926AF4 for ; Sat, 15 Aug 2026 12:28:26 +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=1786796907; cv=none; b=gGGriKMMeG4PEHoLYKG24VSo/ruFFHTeuEJN66NLk2TM9XwKc80rpHrZo1PXVt696OWXK6dTDZsiYb7ZU51Nc3PxL9GS1Vj4Aebinp59y9Tx+dJIg5+NcKRF9Cy0w+8qJFgJOhiYCP4oOXZGdWePowNTOFtHWz/VDyv02BYfveY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786796907; c=relaxed/simple; bh=jDTFiXzAnsGXdQ2/5We5+7LjvD+SPq9GcftMIOifYds=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=B3VOZCZQEk5UowPS8mXPoXTM+FscTzTXNh9Tw73oLZfVtEm3ib3hMUi7T8O8Ptq62QpDd9ZD2ThfkZ7+WOW/tN7ZdIviarybcvV0Fp/4ujGf0r2M9aIpCTw+mE1S2YeppqDb4ClSYy01XdyW0SW+H+vTta0yKN/Ndk3OU9QV/y4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PUhNtNp3; 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="PUhNtNp3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 896E51F000E9; Sat, 15 Aug 2026 12:28:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786796906; bh=VXpYL5bYG5kC5oLiq2QDPbKZWzLOntD83oM98dwbnnM=; h=From:To:Cc:Subject:Date:Reply-To; b=PUhNtNp3PXMQfEUj5KuGo3gyBu3AEQXgpvm2eOc/l0wiOBgMHr7V3S/ZbAd6EA5Sw HJnU6fFBm/gWcbI9qKElaOME739YlWvIRENBU+BiV8UReu6KLdOnU0nUUEyd0cVWyJ y12b2EfGNQ+qfrIW8GmUx2VmcYXHdLUXYFjNTJtw= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74445: drm/vmwgfx: reject DX_BIND_QUERY without a DX context Date: Sat, 15 Aug 2026 21:25:26 +0900 Message-ID: <2026081529-CVE-2026-74445-05de@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=3107; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=Dwgip5BB3znXfI6ozsy6U9A52QYgYW03Dk6Hv4MTQks=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNUTt5M76w7pEtvGi4m0NvSoS/matByr74oo5D90tNJ P9FNMV3xLIwCDIxyIopsnzZxnN0f8UhRS9D29Mwc1iZQIYwcHEKwEQeTWVYsFPxoe4P3h8n1c2r T8/YrVV4Tj05iGGe+peQ7cKuVusDFr0LtP2wsTxXx/AcAA== 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/vmwgfx: reject DX_BIND_QUERY without a DX context vmw_cmd_dx_bind_query() unconditionally dereferences sw_context->dx_ctx_node->ctx. Userspace can trigger a NULL pointer dereference from any render-node fd by submitting an execbuf with dx_context_handle == SVGA3D_INVALID_ID and a SVGA_3D_CMD_DX_BIND_QUERY opcode in the command stream: dx_ctx_node is left NULL and the kernel oopses on the assignment. The same NULL is then re-read in vmw_resources_reserve() via vmw_context_get_dx_query_mob(). All sibling DX handlers fail-close on a missing dx_ctx_node using VMW_GET_CTX_NODE(). Use the same pattern here, returning -EINVAL up front before any relocation state is published. The Linux kernel CVE team has assigned CVE-2026-74445 to this issue. Affected and fixed versions =========================== Issue introduced in 4.20 with commit 9c079b8ce8bf8e0394149eb39c78b04285644bcc and fixed in 6.6.151 with commit 7eae011829f94a76470ec76f016805f508437755 Issue introduced in 4.20 with commit 9c079b8ce8bf8e0394149eb39c78b04285644bcc and fixed in 6.12.103 with commit 0634d50e8b398c25bd07c96b048e484d22688c26 Issue introduced in 4.20 with commit 9c079b8ce8bf8e0394149eb39c78b04285644bcc and fixed in 6.18.44 with commit e479240a1e076ba1104236331abd62400bf1d495 Issue introduced in 4.20 with commit 9c079b8ce8bf8e0394149eb39c78b04285644bcc and fixed in 7.1.8 with commit 6b1eb0b63cc153e1c0cb5ab8350950119be11947 Issue introduced in 4.20 with commit 9c079b8ce8bf8e0394149eb39c78b04285644bcc and fixed in 7.2-rc6 with commit 55ec09c9ce10b1272802c7ab6c1be2ea0dbc68db 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-2026-74445 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/vmwgfx/vmwgfx_execbuf.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/7eae011829f94a76470ec76f016805f508437755 https://git.kernel.org/stable/c/0634d50e8b398c25bd07c96b048e484d22688c26 https://git.kernel.org/stable/c/e479240a1e076ba1104236331abd62400bf1d495 https://git.kernel.org/stable/c/6b1eb0b63cc153e1c0cb5ab8350950119be11947 https://git.kernel.org/stable/c/55ec09c9ce10b1272802c7ab6c1be2ea0dbc68db