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 B4FFA403129 for ; Sat, 15 Aug 2026 12:33:46 +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=1786797227; cv=none; b=lqzjDVhd8064O00Cx+q06zMP9sw5Dhiv5NE0niQsEZM7YmMrSwITtr2Uk7gzjQ3Nl/DmtyQIZV4FXVieng55GFJ5KdI34wuXWu/uJb02jh8JhZT/twl2l1WDHX4nf5IH17qrYSfUAxGtC6Jhq4Tbb+w2aExCdA7T6WH+sBewTB4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786797227; c=relaxed/simple; bh=n89BG2bfVxOTQBLM0Zs3nabyTS2Lggxb5WdwpJcN/v4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Ua93qc0kywd/yEq+UKpb2OrFt6Rp973OssCzGJst7iWS3UO1BlubP0FtzjIoc72L8+3bd6IAA3qc272j/XLMShDwwAp+Hat/o5PYxHL8IvorGoK5mlq+OeQ00s0YlJ0dEZL3Z0VMidDdJdU0SfNsL1pS8MVmt0k6JocqqihSfHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=k59Sam5R; 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="k59Sam5R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B3001F000E9; Sat, 15 Aug 2026 12:33:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786797226; bh=UXNX4vucMZl7z20Xov9YFntBq9krqXk+KBfH9KyM8Ag=; h=From:To:Cc:Subject:Date:Reply-To; b=k59Sam5RnrW8Wq1wQ7QLF1zo5ibZX9qFA/gFQ8zUwZws9kkC9KxhvN9t7XNgXX20n IxhfjZLAufltsqSQQ2jimPCSZoiN/CPWMF+yEMXKDXw33G6KXvv4pe0FIpik9Y6GQ9 iHwgFFoVHSaGPDeLBOiWLha2bhm3n80WP0V3pp0w= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74573: iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE Date: Sat, 15 Aug 2026 21:27:34 +0900 Message-ID: <2026081555-CVE-2026-74573-d1e9@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=2552; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=6vuZYF+ATzVmRrjDVtnpLdbji9nezcbjA6yDglC+pss=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNUZfdXt+x55vmZ/GkU0ZyklfgGZnK3/N8VefPXK70+ /RU8enJHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRcnaG+TFt37KyJ8v9rD77 VGn5+3/cN3wOaTLMlXzKImOlJb1EIfRfaJXmt5OFZWtPAAA= 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: iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE arm_vsmmu_vsid_to_sid() maps a guest's vSID to a single physical Stream ID taken from master->streams[0], assuming a device has exactly one stream. A device with several streams gets only its first one mapped, so a guest vSID invalidation cannot reach the others' ATC and IOTLB entries; a device with none makes master->streams a ZERO_SIZE_PTR, read out of bounds. Add an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP when master->num_streams is not one, rather than mapping it silently. The Linux kernel CVE team has assigned CVE-2026-74573 to this issue. Affected and fixed versions =========================== Issue introduced in 6.13 with commit d68beb276ba26cec47350a6d468e967673ee0c56 and fixed in 6.18.44 with commit 3808bab5d95ae79e333e11f6a73d178e084c645d Issue introduced in 6.13 with commit d68beb276ba26cec47350a6d468e967673ee0c56 and fixed in 7.1.8 with commit 0acbc621341aca4eb94d9c2f43e1ab273ff088f0 Issue introduced in 6.13 with commit d68beb276ba26cec47350a6d468e967673ee0c56 and fixed in 7.2-rc6 with commit c3b8ee84a965058b41275069d4696f37a8b14bf6 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-2026-74573 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/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.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/3808bab5d95ae79e333e11f6a73d178e084c645d https://git.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0 https://git.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6