From nobody Sat Jul 25 14:08:02 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1784287889; cv=none; d=zohomail.com; s=zohoarc; b=Hy2UiOETkzd1YFUWzzEnRuYTWDeW6wIrpBOFpz4TAIt+/hlPxIqa4/hc47R328sEw99MbFQCFT5MXmjFoRMkBCrJs/UElkwsUMdobWF0vD3ctMoS5+qCvI+9R4IYAi5KfxiFwn3NaJ/KuaFMnYWzXaVYyjx31VLI5cudTS+OzoQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1784287889; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=oDqxtqtQmLTe1nOXQhdjELhe62ddcFuq10Pf1MSlvFQ=; b=OplG9uC+NJ9sWJIJ/cSZbZyC8G7hXk7Wyh71GTzHXLQnqdhvdcMNubbeIns3pR/gZxWtfPNfqKtapu09vECqPmf6WvpeAet9Kd7gNuAlIb5Vg/1rWQ3ldu5GRGmNm+92Vb0LUnvXMJVTDLP+pBlEWXgRkFqEXLEkcdp7u5STkrs= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1784287889213748.9992965915852; Fri, 17 Jul 2026 04:31:29 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wkgmI-0007BV-Se; Fri, 17 Jul 2026 07:30:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wkglp-00076S-7C for qemu-devel@nongnu.org; Fri, 17 Jul 2026 07:30:23 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wkgll-0000Xj-RH for qemu-devel@nongnu.org; Fri, 17 Jul 2026 07:30:20 -0400 Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-659-0fLqfB_vP-SkcV9pqM1qyA-1; Fri, 17 Jul 2026 07:30:13 -0400 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 74F9E1955F7A; Fri, 17 Jul 2026 11:30:11 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.44.49.14]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 98A901955D9F; Fri, 17 Jul 2026 11:30:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1784287816; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=oDqxtqtQmLTe1nOXQhdjELhe62ddcFuq10Pf1MSlvFQ=; b=gJZuVnH6UrBU0lp+tbo+zoFHmvLSxvOPJWaW07EM0s5AZVEGEXRwYG+fYxxfK80oUsKAd6 x2xLsdMbt+aCyZ+rR7LrhJ/sarqa/DBx/3F95X1BQLO/fSPd4W2ZKt/WDsJJLs3pT1AnaQ 07SBOpwkTrUWsE3611G8BU4W6R7m/2o= X-MC-Unique: 0fLqfB_vP-SkcV9pqM1qyA-1 X-Mimecast-MFC-AGG-ID: 0fLqfB_vP-SkcV9pqM1qyA_1784287811 From: Thomas Huth To: qemu-devel@nongnu.org Cc: kraxel@redhat.com, Peter Maydell , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , qemu-stable@nongnu.org, "Daniel P . Berrange" , Mauro Matteo Cascella Subject: [PATCH] hw/usb/hcd-xhci-sysbus: Fix OOB heap access in xhci_sysbus_intr_raise() Date: Fri, 17 Jul 2026 13:30:06 +0200 Message-ID: <20260717113006.172612-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: permerror client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.01, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, T_SPF_PERMERROR=0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1784287891283158500 Content-Type: text/plain; charset="utf-8" From: Thomas Huth Some machines like the microvm machine instantiate a "sysbus-xhci" device with just 1 interrupt (by setting the "intrs" property to 1). xhci_sysbus_realize() then only allocates the s->irq array with one entry. Now the generic XHCI code has at least one code path that could call the xhci_sysbus_intr_raise() function with n > 1, so this function calls qemu_set_irq() with s->irq[n] pointing to a bad heap address. The qemu_set_irq() then tries to call an IRQ handler via a function pointer in that heap space - which either causes QEMU to die with a segmentation fault (if it's a bad address), or even worse runs some unexpected code if the destination of the pointer is executable code. Fix the problem by checking for valid interrupt numbers before calling qemu_set_irq(). Fixes: CVE-2026-16043 Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/4001 Reported-by: Tristan Madani Signed-off-by: Thomas Huth --- hw/usb/hcd-xhci-sysbus.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/hw/usb/hcd-xhci-sysbus.c b/hw/usb/hcd-xhci-sysbus.c index 19664c5985e..7ab2f8527bd 100644 --- a/hw/usb/hcd-xhci-sysbus.c +++ b/hw/usb/hcd-xhci-sysbus.c @@ -8,6 +8,7 @@ * SPDX-License-Identifier: GPL-2.0-or-later */ #include "qemu/osdep.h" +#include "qemu/log.h" #include "hw/core/qdev-properties.h" #include "migration/vmstate.h" #include "trace.h" @@ -20,7 +21,12 @@ static bool xhci_sysbus_intr_raise(XHCIState *xhci, int = n, bool level) { XHCISysbusState *s =3D container_of(xhci, XHCISysbusState, xhci); =20 - qemu_set_irq(s->irq[n], level); + if (n < xhci->numintrs) { + qemu_set_irq(s->irq[n], level); + } else { + qemu_log_mask(LOG_GUEST_ERROR, + "unexpected IRQ #%i raised on xhci\n", n); + } =20 return false; } --=20 2.55.0