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 8B6DC207E00 for ; Thu, 17 Sep 2026 16:29:59 +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=1789662600; cv=none; b=hx05C1yI8b2xZE7TN1J5kij4v+CMStYr2MGevcITu1bIwbsodeH+0E4cuK7g64dq1FHLIdoVUtuHG9p6Ef3limAJxBPN/mhBqsKjFKsAbN0N4SP1oWQE13cASx2K+otIGIbGbPnq1YGELHI+72o2tRgRzuLP+S+qO74f7eL5UhY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789662600; c=relaxed/simple; bh=PPBDx/h8Dmtq2u2P7OLngs7f8hxAXLxX0RbFEUGN/qU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=UrvEzYLP9vkuGAG6OwbgneZielkTehbHNAOzsy/14I295xupxtXf6HSidkKPE7nw4BYKyNVEezMNz7rhN+Tmhn91ZBsu6p4wObMQkY0QCP0R7BIdAioSC9FjDqQKCqA29ju+WXTLBXXeQSOxF+gJBjogddqe1kLDXs3sIFZvo94= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VaYprsoy; 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="VaYprsoy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E54AF1F00893; Thu, 17 Sep 2026 16:29:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789662599; bh=xYkjbfsaN0v1owuIxbFbY+BNPSsKABcimuER32eH+Ak=; h=From:To:Cc:Subject:Date:Reply-To; b=VaYprsoyemHos7gyFctfMzFpiJcRdw9agNUlWTBEnvIAJ1IgXE0uOvAG1mUqclL93 F3ZONvh2l15dfw+Sdb8aPUHXhy5TbA3V8Qrup0M57KeKZ9iSwSwQ8P2c3Gi7sx6IOh +0NeTgVCN+ce6vFwGj/06xFUl32mG4Z09E1ceFeY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-90409: drm/panthor: Add vm_bind region with kbo range overlap check Date: Thu, 17 Sep 2026 17:13:59 +0100 Message-ID: <2026091716-CVE-2026-90409-d736@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=2768; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=eRtA6gKcbork1NdxWrNQkKPNiD2AMYxBv2jci/etV4s=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlrBNZI+aZpa11VOZ10rMlTSv+7+L7fmwtb/dYmb/l32 fGLsu7XjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjIOzaGWcz1VbZ675ZI/PhQ mMBvZHn9xUbrRIZ5hraXGkwf6Uts+X6voWq3X4HkWUEdAA== 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/panthor: Add vm_bind region with kbo range overlap check When a VM is created, caller has to specify the range of the address space carve-out set aside for mapping kernel BO's. That means vm_bind mappings of UM-exposed BO's should not intersect with that region, but at the moment we're not checking this. At first, I thought of giving these values to drm_gpuvm_init() through its reserve_{offset, range} arguments, but it turns out that is meant for VM address spans that are not managed through the usual drm_gpuvm split/merge circuit, so storing the end of the user VA range at VM creation time and doing a quick check in the vm_bind ioctl path was the simplest workaround. The new check also makes sure vm_bind range doesn't overflow the size of a 64-bit unsigned integer. That was already being done further down the call stack inside drm_gpuvm_sm_map -> drm_gpuvm_range_valid, but it's best to fail early in the driver before GPUVM functions are invoked so that we won't waste time allocating vm_bind context resources. The Linux kernel CVE team has assigned CVE-2026-90409 to this issue. Affected and fixed versions =========================== Issue introduced in 6.10 with commit 647810ec247641eb5aec8caef818919a4518a0b1 and fixed in 7.2.6 with commit 761cf9c63274a5b711c3dc829601723215710d2d Issue introduced in 6.10 with commit 647810ec247641eb5aec8caef818919a4518a0b1 and fixed in 7.3-rc1 with commit 985f5e12f3cdf43030e13c2bbd154913133b5c3f 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-2026-90409 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/panthor/panthor_mmu.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/761cf9c63274a5b711c3dc829601723215710d2d https://git.kernel.org/stable/c/985f5e12f3cdf43030e13c2bbd154913133b5c3f