Bugzilla – Bug 1197423
VUL-0: CVE-2022-26356: xen: Racy interactions between dirty vram tracking and paging log dirty hypercalls (XSA-397)
Last modified: 2022-08-11 23:15:41 UTC
Every codestream is affected: - SUSE:SLE-11-SP1:Update:Teradata - SUSE:SLE-11-SP3:Update - SUSE:SLE-11-SP3:Update:Teradata - SUSE:SLE-11-SP4:Update - SUSE:SLE-12-SP2:Update - SUSE:SLE-12-SP3:Update - SUSE:SLE-12-SP4:Update - SUSE:SLE-12-SP5:Update - SUSE:SLE-15:Update - SUSE:SLE-15-SP1:Update - SUSE:SLE-15-SP2:Update - SUSE:SLE-15-SP3:Update - SUSE:SLE-15-SP4:Update Note that SUSE:SLE-11-SP1:Update:Teradata is EoL in the end of this month
Public! https://xenbits.xen.org/xsa/advisory-397.html Xen Security Advisory CVE-2022-26356 / XSA-397 version 2 Racy interactions between dirty vram tracking and paging log dirty hypercalls UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Activation of log dirty mode done by XEN_DMOP_track_dirty_vram (was named HVMOP_track_dirty_vram before Xen 4.9) is racy with ongoing log dirty hypercalls. A suitably timed call to XEN_DMOP_track_dirty_vram can enable log dirty while another CPU is still in the process of tearing down the structures related to a previously enabled log dirty mode (XEN_DOMCTL_SHADOW_OP_OFF). This is due to lack of mutually exclusive locking between both operations and can lead to entries being added in already freed slots, resulting in a memory leak. IMPACT ====== An attacker can cause Xen to leak memory, eventually leading to a Denial of Service (DoS) affecting the entire host. VULNERABLE SYSTEMS ================== All Xen versions from at least 4.0 onwards are vulnerable. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only domains controlling an x86 HVM guest using Hardware Assisted Paging (HAP) can leverage the vulnerability. On common deployments this is limited to domains that run device models on behalf of guests. MITIGATION ========== Using only PV or PVH guests and/or running HVM guests in shadow mode will avoid the vulnerability. CREDITS ======= This issue was discovered by Roger Pau Monné of Citrix. RESOLUTION ========== 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. xsa397.patch xen-unstable xsa397-4.16.patch Xen 4.16.x - Xen 4.15.x xsa397-4.14.patch Xen 4.14.x - Xen 4.13.x xsa397-4.12.patch Xen 4.12.x $ sha256sum xsa397* 49c663e2bb9131dbc2488e12487f79bdf0dafd51a32413cbf3964e39d8779cae xsa397.patch 24f95f47b79739c9cb5b9110137c802989356c82d0aa27963b5ac7e33f667285 xsa397-4.12.patch 9af14f90ba10d074425eb6072a6c648082c92c1cf8b6f881f57ed2fc13d6e49d xsa397-4.14.patch ff5dd3b7a8dbf349c3b832b7916322c0296fa59c7f9cd2ba30858989add5f65c xsa397-4.16.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches 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 (except to other members of the predisclosure list) or deployment of mitigations is prohibited. 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
This is an autogenerated message for OBS integration: This bug (1197423) was mentioned in https://build.opensuse.org/request/show/967124 Factory / xen
Backports and submissions to SLE12-SP2 complete. No further work planned.
SUSE-SU-2022:1285-1: An update that fixes 9 vulnerabilities is now available. Category: security (important) Bug References: 1196915,1197423,1197425,1197426 CVE References: CVE-2021-26401,CVE-2022-0001,CVE-2022-0002,CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: SUSE OpenStack Cloud Crowbar 9 (src): xen-4.11.4_28-2.73.1 SUSE OpenStack Cloud 9 (src): xen-4.11.4_28-2.73.1 SUSE Linux Enterprise Server for SAP 12-SP4 (src): xen-4.11.4_28-2.73.1 SUSE Linux Enterprise Server 12-SP4-LTSS (src): xen-4.11.4_28-2.73.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:1300-1: An update that fixes 9 vulnerabilities is now available. Category: security (important) Bug References: 1194267,1196915,1197423,1197425,1197426 CVE References: CVE-2021-26401,CVE-2022-0001,CVE-2022-0002,CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: SUSE Manager Server 4.1 (src): xen-4.13.4_08-150200.3.50.1 SUSE Manager Retail Branch Server 4.1 (src): xen-4.13.4_08-150200.3.50.1 SUSE Manager Proxy 4.1 (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise Server for SAP 15-SP2 (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise Server 15-SP2-LTSS (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise Server 15-SP2-BCL (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise Realtime Extension 15-SP2 (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise Micro 5.0 (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise High Performance Computing 15-SP2-LTSS (src): xen-4.13.4_08-150200.3.50.1 SUSE Linux Enterprise High Performance Computing 15-SP2-ESPOS (src): xen-4.13.4_08-150200.3.50.1 SUSE Enterprise Storage 7 (src): xen-4.13.4_08-150200.3.50.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:1359-1: An update that fixes 9 vulnerabilities is now available. Category: security (important) Bug References: 1196915,1197423,1197425,1197426 CVE References: CVE-2021-26401,CVE-2022-0001,CVE-2022-0002,CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: SUSE Linux Enterprise Server for SAP 15 (src): xen-4.10.4_34-150000.3.74.1 SUSE Linux Enterprise High Performance Computing 15-LTSS (src): xen-4.10.4_34-150000.3.74.1 SUSE Linux Enterprise High Performance Computing 15-ESPOS (src): xen-4.10.4_34-150000.3.74.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:1375-1: An update that fixes 10 vulnerabilities is now available. Category: security (important) Bug References: 1182846,1196915,1197423,1197425,1197426 CVE References: CVE-2021-20257,CVE-2021-26401,CVE-2022-0001,CVE-2022-0002,CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: SUSE Linux Enterprise Server 12-SP2-BCL (src): xen-4.7.6_22-43.88.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:1408-1: An update that fixes 9 vulnerabilities is now available. Category: security (important) Bug References: 1196915,1197423,1197425,1197426 CVE References: CVE-2021-26401,CVE-2022-0001,CVE-2022-0002,CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: SUSE OpenStack Cloud Crowbar 8 (src): xen-4.9.4_28-3.103.1 SUSE OpenStack Cloud 8 (src): xen-4.9.4_28-3.103.1 SUSE Linux Enterprise Server for SAP 12-SP3 (src): xen-4.9.4_28-3.103.1 SUSE Linux Enterprise Server 12-SP3-LTSS (src): xen-4.9.4_28-3.103.1 SUSE Linux Enterprise Server 12-SP3-BCL (src): xen-4.9.4_28-3.103.1 HPE Helion Openstack 8 (src): xen-4.9.4_28-3.103.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:1505-1: An update that fixes 6 vulnerabilities is now available. Category: security (moderate) Bug References: 1197423,1197425,1197426 CVE References: CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: SUSE Linux Enterprise Software Development Kit 12-SP5 (src): xen-4.12.4_22-3.66.1 SUSE Linux Enterprise Server 12-SP5 (src): xen-4.12.4_22-3.66.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:1506-1: An update that fixes 6 vulnerabilities is now available. Category: security (moderate) Bug References: 1197423,1197425,1197426 CVE References: CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361 JIRA References: Sources used: openSUSE Leap 15.3 (src): xen-4.14.4_04-150300.3.24.1 SUSE Linux Enterprise Module for Server Applications 15-SP3 (src): xen-4.14.4_04-150300.3.24.1 SUSE Linux Enterprise Module for Basesystem 15-SP3 (src): xen-4.14.4_04-150300.3.24.1 SUSE Linux Enterprise Micro 5.2 (src): xen-4.14.4_04-150300.3.24.1 SUSE Linux Enterprise Micro 5.1 (src): xen-4.14.4_04-150300.3.24.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:2158-1: An update that fixes 9 vulnerabilities is now available. Category: security (important) Bug References: 1197423,1197425,1197426,1199965,1199966 CVE References: CVE-2022-26356,CVE-2022-26357,CVE-2022-26358,CVE-2022-26359,CVE-2022-26360,CVE-2022-26361,CVE-2022-26362,CVE-2022-26363,CVE-2022-26364 JIRA References: Sources used: SUSE Linux Enterprise Server for SAP 15-SP1 (src): xen-4.12.4_24-150100.3.72.1 SUSE Linux Enterprise Server 15-SP1-LTSS (src): xen-4.12.4_24-150100.3.72.1 SUSE Linux Enterprise Server 15-SP1-BCL (src): xen-4.12.4_24-150100.3.72.1 SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS (src): xen-4.12.4_24-150100.3.72.1 SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS (src): xen-4.12.4_24-150100.3.72.1 SUSE Enterprise Storage 6 (src): xen-4.12.4_24-150100.3.72.1 SUSE CaaS Platform 4.0 (src): xen-4.12.4_24-150100.3.72.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.