From nobody Sat Jun 13 07:30:02 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1781006484733705.0801273937997; Tue, 9 Jun 2026 05:01:24 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1332661.1595142 (Exim 4.92) (envelope-from ) id 1wWv8j-0006eO-Ce; Tue, 09 Jun 2026 12:01:05 +0000 Received: by outflank-mailman (output) from mailman id 1332661.1595142; Tue, 09 Jun 2026 12:01:05 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1wWv8j-0006d2-8z; Tue, 09 Jun 2026 12:01:05 +0000 Received: by outflank-mailman (input) for mailman id 1332661; Tue, 09 Jun 2026 12:01:04 +0000 Received: from mx.expurgate.net ([195.190.135.10]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1wWv8i-0006aL-4M; Tue, 09 Jun 2026 12:01:04 +0000 Received: from mx.expurgate.net (helo=localhost) by mx.expurgate.net with esmtp id 1wWv8h-004DW7-H0; Tue, 09 Jun 2026 14:01:03 +0200 Received: from [10.42.69.5] (helo=localhost) by localhost with ESMTP (eXpurgate MTA 0.9.1) (envelope-from ) id 6a28007f-bab6-0a2a0a5309dd-0a2a45059c60-2 for ; Tue, 09 Jun 2026 14:01:03 +0200 Received: from [104.130.215.37] (helo=mail.xenproject.org) by tlsNG-c201ff.mxtls.expurgate.net with ESMTPS (eXpurgate 4.56.1) (envelope-from ) id 6a28007d-aaa8-0a2a45050019-6882d725a77a-3 for ; Tue, 09 Jun 2026 14:01:03 +0200 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.96) (envelope-from ) id 1wWv8b-001enz-0T; Tue, 09 Jun 2026 12:00:56 +0000 Received: from andrewcoop by xenbits.xenproject.org with local (Exim 4.96) (envelope-from ) id 1wWv8a-00CQaD-2W; Tue, 09 Jun 2026 12:00:56 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Authentication-Results: eu.smtp.expurgate.cloud; none Content-Type: multipart/mixed; boundary="=separator"; charset="utf-8" Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.510 (Entity 5.510) To: xen-announce@lists.xen.org, xen-devel@lists.xen.org, xen-users@lists.xen.org, oss-security@lists.openwall.com From: Xen.org security team CC: Xen.org security team Subject: Xen Security Advisory 491 v2 (CVE-2026-42487) - x86 HVM I/O port list traversal Message-Id: Date: Tue, 09 Jun 2026 12:00:56 +0000 X-purgate-ID: tlsNG-c201ff/1781006463-DB563443-07B5885F/0/0 X-purgate-type: clean X-purgate-size: 23868 X-Zoho-Virus-Status: 1 X-Zoho-AV-Stamp: zmail-av-0.2.10.1.5.2/280.973.71 X-ZM-MESSAGEID: 1781006487055154100 --=separator Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Reviewed-by: Roger Pau Monn=C3=A9 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2026-42487 / XSA-491 version 2 x86 HVM I/O port list traversal UPDATES IN VERSION 2 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Public release. ISSUE DESCRIPTION =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D HVM guest I/O port accesses are subject to either emulation or at least translation. Translations are managed by the device model (via XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed at any time. Traversal of those lists (while handling guest I/O port accesses) therefore needs synchronizing with updates, which was missing so far. IMPACT =3D=3D=3D=3D=3D=3D A device model of a HVM guest can cause a hypervisor crash, causing a Denial of Service (DoS) of the entire host. Privilege escalation and information leaks cannot be ruled out. VULNERABLE SYSTEMS =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D All Xen versions from at least 3.2 onwards are vulnerable. Earlier versions have not been inspected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only entities controlling HVM guests can leverage the vulnerability. These are device models running in either a stub domain or de-privileged in Dom0. MITIGATION =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Running only PV or PVH guests will avoid the vulnerability. (Switching from a device model stub domain or a de-privileged device model to a fully privileged Dom0 device model does NOT mitigate this vulnerability. Rather, it simply recategorises the vulnerability to hostile management code, regarding it "as designed"; thus it merely reclassifies these issues as "not a bug". The security of a Xen system using stub domains is still better than with a qemu-dm running as a Dom0 process. Users and vendors of stub qemu dm systems should not change their configuration to use a Dom0 qemu process.) CREDITS =3D=3D=3D=3D=3D=3D=3D This issue was discovered by Jan Beulich of SUSE. RESOLUTION =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Applying the appropriate attached patch resolves this issue. Note that patches for released versions are generally prepared to apply to the stable branches, and may not apply cleanly to the most recent release tarball. Downstreams are encouraged to update to the tip of the stable branch before applying these patches. xsa491.patch xen-unstable xsa491-4.21.patch Xen 4.21.x - Xen 4.17.x $ sha256sum xsa491* 23a90da1c71389083351846169fc565a671b44f5f4ba838b18fc0fa6d7582bf8 xsa491.pa= tch 443674f42a092b953b6ba4d91cfa19bfbee0077dfcd5a39ae53368e40ed23aac xsa491-4.= 21.patch $ DEPLOYMENT DURING EMBARGO =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) For more information about permissible uses of embargoed information, consult the Xen Project community's agreed Security Policy: http://www.xenproject.org/security-policy.html -----BEGIN PGP SIGNATURE----- iQFABAEBCAAqFiEEI+MiLBRfRHX6gGCng/4UyVfoK9kFAmon+4gMHHBncEB4ZW4u b3JnAAoJEIP+FMlX6CvZGqMIAJ3p3v2yhpMhVPL7ClsuYuz8ks1cVHn4d4971wCS gao1KbD+k8xjiqrR5pdCO/cHViXmajPk7sV4NwOsSmW1KQ8ejQrps3v16/IOTIjp JzcDRqk2J6IurQE819kIe0B7vQlgfElK1ZUq070DljChzBwcuWnaXywacgh/eofo SpElIHLtlM9RPmPTPaAI5inEIANb2Rrqdgt6yUg3XqSUN77h4ma8GLZH+Tt2x6Zg HN9BjZcSmcRkOwWK80g30rQ0ZltSSh0ExM5Jhk0vtulbK5BeO7dAphElwbBjAwb2 RjuoQhvS4QkvCEZGpUIiFJKtxlixhqZZl9CFYm0b4Xe/aJA=3D =3D8fKa -----END PGP SIGNATURE----- --=separator Content-Type: application/octet-stream; name="xsa491.patch" Content-Disposition: attachment; filename="xsa491.patch" Content-Transfer-Encoding: base64 RnJvbTogSmFuIEJldWxpY2ggPGpiZXVsaWNoQHN1c2UuY29tPgpTdWJqZWN0 OiB4ODYvSFZNOiBhZGQgbG9ja2luZyB0byBJL08gcG9ydCB0cmFuc2xhdGlv 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