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 65B62582BBA for ; Fri, 11 Sep 2026 19:52:06 +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=1789156337; cv=none; b=bUuH6Lglzl1TKMhuH1GEXVMdT4GE42RZYwy1xacu9iaij6/xpjMh4ZYAwRk3r6VQsKaDlVsb2HL8cPTQ8ryuUDckbiXDnT9cLX3Ov/RJIZf1wKLuTIGsgNT0wmI36gQQ6+EZ5pda1DXZBaF8ALVnyQzqEc4CqvJH04GRu2CzeyA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156337; c=relaxed/simple; bh=McN1LQO3dHvb6frF9Ip+4/K87vUeFYtSOOKEI0TS0i0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=XECVLeF7NM041a5tIltd3DjKsm94ETds3i2LJ+E41P3WbAMszo7AJ69iePKVhMjmbT4aKgPxuTNzmGJbMUvleu/LlsZP/OrN32GM3ukjXRGYxSY0aUZ774nrUMjSNx6WDEivAlk/WzQ8JpmWbS5Yb4ZeWj6DWHMp+acfVJI7yac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Mr7JvrpA; 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="Mr7JvrpA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66F321F00898; Fri, 11 Sep 2026 19:52:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156324; bh=uLXMRNDShUnIiHBjF6f/Ns5HjmNklOP7DoykJ8Eq6xg=; h=From:To:Cc:Subject:Date:Reply-To; b=Mr7JvrpATb97BHFzhMXbsfnxxMjCA+TzLzF4hUuWmaY3ohWOunGSZ9PRkBn+vHeq9 as+M20FMsnG0QRqVgOFN9bFzBinPvyNe9+R8Y8DTbCnbhsP221Eji+YnciJwFhJAKS Tr7ry4auDjNolkOpP3/lEXeXICOgV6ZQAWzVqSlg= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89445: iommufd: Fix UAF in selftest IOPF reporting Date: Fri, 11 Sep 2026 21:42:14 +0200 Message-ID: <2026091157-CVE-2026-89445-c2c8@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=2882; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=iIKiVb5RaCt3pd4KyZckigVkAQJkiej7ErTuWWBTX/o=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIj07Yx4e33Rozd3s2fELA5d+XOZ+aLOxqo1z3uYFB 48tu5JyvCOWhUGQiUFWTJHlyzaeo/srDil6GdqehpnDygQyhIGLUwAm0tXFMJu15vk/C+uAlYxK a297+sqVLglXOMywYPKn5WEVm2x13z9zkbwgtjLJJn36ZQA= 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: iommufd: Fix UAF in selftest IOPF reporting IOMMUFD selftest TRIGGER_IOPF borrows an attach handle from group->pasid_array without synchronizing against PASID detach, then a concurrent iommu_report_device_fault() can dereference that borrowed handle's domain pointer after the detach erases the handle and frees the backing struct iommufd_attach_handle. TRIGGER_IOPF then dereferences the freed handle, causing a UAF. Fix by adding a iopf_rwsem in mock_dev to follow the expected design of a real driver. Hold its read side across the whole iommu_report_device_fault() call, and its write side around every path that attaches, detaches, or replaces a device domain. This can block new reports and drains in-flight reports before an old attach handle or the IOPF fault parameter can be removed. Also take the write side while registering a mock device, since it can invoke the mock driver's default-domain attach callback. The Linux kernel CVE team has assigned CVE-2026-89445 to this issue. Affected and fixed versions =========================== Issue introduced in 6.11 with commit ddee19971081b42615d62f4fdada21274708ed4d and fixed in 6.18.50 with commit cab2895729516799384d48560e6fca105fb3f927 Issue introduced in 6.11 with commit ddee19971081b42615d62f4fdada21274708ed4d and fixed in 7.2.4 with commit e27e90bde68b2ab92e63ed19caad1ef57188bea0 Issue introduced in 6.11 with commit ddee19971081b42615d62f4fdada21274708ed4d and fixed in 7.3-rc1 with commit 8c07df7cdfcf52f1ff276c588612aabc6c6b8399 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-2026-89445 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/iommufd/selftest.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/cab2895729516799384d48560e6fca105fb3f927 https://git.kernel.org/stable/c/e27e90bde68b2ab92e63ed19caad1ef57188bea0 https://git.kernel.org/stable/c/8c07df7cdfcf52f1ff276c588612aabc6c6b8399