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 7472C37187E for ; Sat, 15 Aug 2026 12:28:20 +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=1786796901; cv=none; b=Al7BYgpOmXBUlHRZ9hTQDDSuowMCVVcXweuCwreS+T6VMRYbxqUzRB8Qctp89QjJco5fzfNXXgwjwZLiolJrzdAUiEuMIXqu8ccX+o+lqlvkV7LI8PYrnJ4eN9UeyuT7xcMM2qaaeDc2Pd9Zzpz1uA9U7kuFLmV47prWgN8J19c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786796901; c=relaxed/simple; bh=aho5OYv/jWIhvGkZomaYdRT/iLgL4H0dcwPF+AbU4CU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=a8rS6SA1WHrilRURZrhwqngPoRoZeWvSx0xVlfcl2a5IwKCA9Q8mgGmbOBRd3gf35CY+00Tqt2Uqp+lohuAlZNpem4NF79JcWEEOJm2EjDLNx0+XcFtHsqzJZ4taP0io4TWpNa3i5z55HUIz+j6HFsbuWyD3/Y4flbgvHPd4Y/k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=P2sU3Phn; 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="P2sU3Phn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C60771F000E9; Sat, 15 Aug 2026 12:28:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786796900; bh=YcFuJTSJCCiF8xW3XwG1Qmt80uLC92Xhz/kCg32TZ88=; h=From:To:Cc:Subject:Date:Reply-To; b=P2sU3PhnrSe+xP2YUAtqgJgnIZm2JSTB9N+waqE8ND+d7Jy5TX1bON/mjaF4ohmJw RWY9zrMzmKpc9ENy0y5qOhdN8J12QUyEoRdzqVJAM89jjuaVxONqo7kAxPHUFR2G7B tRyeJCJq66A7mypVQirMt+9QEzssp28yh3XRPQqc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74443: drm/vmwgfx: bound DMA command body size against suffix pointer Date: Sat, 15 Aug 2026 21:25:24 +0900 Message-ID: <2026081529-CVE-2026-74443-8d88@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=3127; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=7pG7F9KDiI+uNvF1wHM22vO412D7wXF3jHgS2HJQYFw=; b=kA0DAAIRMUfUDdst+ykByyZiAGqAWrmhhgZq1YcTSL2bMObdLB9Tv/1fF9EvYSr7TMCX10xj6 YhdBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmqAWrkACgkQMUfUDdst+ymB0wCdGwfP zMi9eFH2UFty/DSkgNLXeSAAn36FM44ttZ/unGWdgTr+gaWmSs1q 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: bound DMA command body size against suffix pointer vmw_cmd_dma() locates the DMA suffix at (unsigned long) &cmd->body + header->size - sizeof(*suffix) without checking that header->size is large enough to contain both cmd->body and the suffix. An undersized header makes the suffix pointer underflow back into the previous command in the bounce buffer. The verifier later writes suffix->maximumOffset, clobbering verified fields of an already-relocated earlier command -- a TOCTOU on the device-visible command stream that lets one command rewrite another's GMR id, surface id, or other authenticated fields. Reject the command if the body is too small for the suffix to fit. The Linux kernel CVE team has assigned CVE-2026-74443 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.33 with commit 4e4ddd47774313accc86b233d6ca2c6a9037a671 and fixed in 6.6.151 with commit 036e16ada95389bdc30f41068af04c1d0872fad0 Issue introduced in 2.6.33 with commit 4e4ddd47774313accc86b233d6ca2c6a9037a671 and fixed in 6.12.103 with commit d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7 Issue introduced in 2.6.33 with commit 4e4ddd47774313accc86b233d6ca2c6a9037a671 and fixed in 6.18.44 with commit 7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6 Issue introduced in 2.6.33 with commit 4e4ddd47774313accc86b233d6ca2c6a9037a671 and fixed in 7.1.8 with commit 9759da60e38d7b9db44dc92713e4e0391883d221 Issue introduced in 2.6.33 with commit 4e4ddd47774313accc86b233d6ca2c6a9037a671 and fixed in 7.2-rc6 with commit f4f1db96bfd68b81053693ba53405b6f510ac16c 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-2026-74443 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/036e16ada95389bdc30f41068af04c1d0872fad0 https://git.kernel.org/stable/c/d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7 https://git.kernel.org/stable/c/7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6 https://git.kernel.org/stable/c/9759da60e38d7b9db44dc92713e4e0391883d221 https://git.kernel.org/stable/c/f4f1db96bfd68b81053693ba53405b6f510ac16c