{"id":"CVE-2018-7550","aliases":["DEBIAN-CVE-2018-7550","DLA-1350-1","DLA-1351-1","DLA-1497-1","DSA-4213-1","EUVD-2018-19277","GHSA-6q85-h749-54pf","GHSA-f49v-45qp-cv53","RHSA-2018:1369","RHSA-2018:1643","RHSA-2018:1644","RHSA-2018:1645","RHSA-2018:1646","RHSA-2018:2462","SUSE-SU-2018:0762-1","SUSE-SU-2018:0831-1","SUSE-SU-2018:1077-1","SUSE-SU-2018:1177-1","SUSE-SU-2018:1181-1","SUSE-SU-2018:1202-1","SUSE-SU-2018:1203-1","SUSE-SU-2018:1308-1","SUSE-SU-2018:2340-1","UBUNTU-CVE-2018-7550","USN-3649-1"],"status":"published","title":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local...","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory 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load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2018-03-01T00:00:00Z","modified":"2024-08-05T06:31:04.536Z","updated_at":"2026-11-02T14:35:09.908186Z"}],"euvd":[{"id":"EUVD-2018-19277","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2018-03-01T00:00:00Z","modified":"2024-08-05T06:31:04Z","updated_at":"2026-11-03T02:40:05.625439Z"}],"ghsa":[{"id":"GHSA-6q85-h749-54pf","title":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local...","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2022-05-13T01:14:40Z","modified":"2024-01-31T00:30:17Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:55:30.717237Z"}],"nvd":[{"id":"CVE-2018-7550","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2018-03-01T17:29:00.523Z","modified":"2026-06-17T02:03:21.317Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-125","CWE-787"],"updated_at":"2026-11-02T14:04:23.783914Z"}],"osv":[{"id":"CVE-2018-7550","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2018-03-01T17:29:00.523Z","modified":"2026-10-24T10:30:55.818822312Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:09.74357Z"},{"id":"DEBIAN-CVE-2018-7550","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2018-03-01T17:29:00.523Z","modified":"2026-10-23T18:03:58.597660064Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:31.170944Z"},{"id":"RHSA-2018:1369","title":"Red Hat Security Advisory: qemu-kvm-rhev security and bug fix update","status":"published","published":"2024-09-13T19:48:12Z","modified":"2026-06-29T10:20:08Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"RHSA-2018:1643","title":"Red Hat Security Advisory: qemu-kvm-rhev security update","status":"published","published":"2024-09-29T17:15:51Z","modified":"2026-06-29T10:20:29Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"RHSA-2018:1644","title":"Red Hat Security Advisory: qemu-kvm-rhev security update","status":"published","published":"2024-09-29T17:15:57Z","modified":"2026-06-29T10:20:29Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"RHSA-2018:1645","title":"Red Hat Security Advisory: qemu-kvm-rhev security update","status":"published","published":"2024-09-29T17:16:03Z","modified":"2026-06-29T10:20:30Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"RHSA-2018:1646","title":"Red Hat Security Advisory: qemu-kvm-rhev security update","status":"published","published":"2024-09-29T17:16:09Z","modified":"2026-06-29T10:20:30Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:04.822845Z"},{"id":"RHSA-2018:2462","title":"Red Hat Security Advisory: qemu-kvm security and bug fix update","status":"published","published":"2024-09-13T19:49:55Z","modified":"2026-06-29T10:21:44Z","cvss":[{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:05.383061Z"},{"id":"UBUNTU-CVE-2018-7550","description":"The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.","status":"published","published":"2018-03-01T00:00:00Z","modified":"2026-02-04T03:05:18.498996Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"},{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:18.772093Z"},{"id":"DLA-1350-1","title":"qemu-kvm - security update","status":"published","published":"2018-04-17T00:00:00Z","modified":"2026-03-09T01:01:14.106482Z","updated_at":"2026-11-02T15:46:09.336894Z"},{"id":"DLA-1351-1","title":"qemu - security update","status":"published","published":"2018-04-17T00:00:00Z","modified":"2026-03-09T01:00:59.398185Z","updated_at":"2026-11-02T15:46:09.336894Z"},{"id":"DLA-1497-1","title":"qemu - security update","status":"published","published":"2018-09-06T00:00:00Z","modified":"2026-03-09T01:23:01.174268Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DSA-4213-1","title":"qemu - security update","status":"published","published":"2018-05-29T00:00:00Z","modified":"2026-03-09T02:10:12.301124Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"SUSE-SU-2018:0762-1","title":"Security update for qemu","description":"This update for qemu fixes the following issues:\n\nThis update has the next round of Spectre v2 related patches, which\nnow integrate with corresponding changes in libvirt. (CVE-2017-5715\nbsc#1068032)\n\nThe January 2018 release of qemu initially addressed the Spectre v2\nvulnerability for KVM guests by exposing the spec-ctrl feature\nfor all x86 vcpu types, which was the quick and dirty approach,\nbut not the proper solution.\n\nWe replaced our initial patch by the patches from upstream.\n\nThis update defines spec_ctrl and ibpb cpu feature flags as well as new\ncpu models which are clones of existing models with either -IBRS or -IBPB\nadded to the end of the model name. These new vcpu models explicitly\ninclude the new feature(s), whereas the feature flags can be added\nto the cpu parameter as with other features. In short, for continued\nSpectre v2 protection, ensure that either the appropriate cpu feature\nflag is added to the QEMU command-line, or one of the new cpu models is\nused.\n\nAlthough migration from older versions is supported, the new cpu\nfeatures won't be properly exposed to the guest until it is restarted\nwith the cpu features explicitly added. A reboot is insufficient.\n\nA warning patch is added which attempts to detect a migration\nfrom a qemu version which had the quick and dirty fix (it only\ndetects certain cases, but hopefully is helpful.)\nFor additional information on Spectre v2 as it relates to QEMU,\nsee:\n        https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/\n\nA patch is added to continue to detect Spectre v2 mitigation\nfeatures (as shown by cpuid), and if found provide that feature\nto guests, even if running on older KVM (kernel) versions which\ndo not yet expose that feature to QEMU. (bsc#1082276)\n\nThese two patches will be removed when we can reasonably assume\neveryone is running with the appropriate updates.\n\nSpectre fixes for IBM Z Series were included by providing more hw features\nto guests (bsc#1076813)\n\nAlso security fixes for the following CVE issues are included:\n\n- CVE-2017-17381: The Virtio Vring implementation in QEMU allowed local OS guest users to cause a denial of service (divide-by-zero error and QEMU process crash) by unsetting vring alignment while updating Virtio rings. (bsc#1071228)\n- CVE-2017-16845: The PS2 driver in Qemu did not validate 'rptr' and 'count' values during guest migration, leading to out-of-bounds access. (bsc#1068613)\n- CVE-2017-15119: The Network Block Device (NBD) server in Quick Emulator (QEMU), was vulnerable to a denial of service issue. It could occur if a client sent large option requests, making the server waste CPU time on reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other requests, resulting in DoS. (bsc#1070144)\n- CVE-2017-18043: Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allowed a user to cause a denial of service (Qemu process crash). (bsc#1076775)\n- CVE-2018-5683: The VGA driver in Qemu allowed local OS guest privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) by leveraging improper memory address validation. (bsc#1076114)\n- CVE-2018-7550: The multiboot functionality in Quick Emulator (aka QEMU) allowed local guest OS users to execute arbitrary code on the QEMU host via an out-of-bounds read or write memory access. (bsc#1083291)\n- CVE-2017-15124: VNC server implementation in Quick Emulator (QEMU) was found to be vulnerable to an unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A malicious remote VNC client could use this flaw to cause DoS to the server host. (bsc#1073489)\n\nAdditional bugs fixed:\n\n- Fix pcihp for 1.6 and older machine types (bsc#1074572)\n- Fix packaging dependencies (coreutils) for qemu-ksm package (bsc#1040202)\n","status":"published","published":"2018-03-21T16:41:39Z","modified":"2026-02-04T02:54:59.254158Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:0831-1","title":"Security update for qemu","description":"\n  \nThis update for qemu fixes the following issues:\n\nThis update has the next round of Spectre v2 related patches, which\nnow integrate with corresponding changes in libvirt. (CVE-2017-5715\nbsc#1068032)\n\nThe January 2018 release of qemu initially addressed the Spectre v2\nvulnerability for KVM guests by exposing the spec-ctrl feature\nfor all x86 vcpu types, which was the quick and dirty approach,\nbut not the proper solution.\n\nWe replaced our initial patch by the patches from upstream.\n\nThis update defines spec_ctrl and ibpb cpu feature flags as well as new\ncpu models which are clones of existing models with either -IBRS or -IBPB\nadded to the end of the model name. These new vcpu models explicitly\ninclude the new feature(s), whereas the feature flags can be added\nto the cpu parameter as with other features. In short, for continued\nSpectre v2 protection, ensure that either the appropriate cpu feature\nflag is added to the QEMU command-line, or one of the new cpu models is\nused.\n\nAlthough migration from older versions is supported, the new cpu\nfeatures won't be properly exposed to the guest until it is restarted\nwith the cpu features explicitly added. A reboot is insufficient.\n\nA warning patch is added which attempts to detect a migration\nfrom a qemu version which had the quick and dirty fix (it only\ndetects certain cases, but hopefully is helpful.)\nFor additional information on Spectre v2 as it relates to QEMU,\nsee:\n\thttps://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/\n\nA patch is added to continue to detect Spectre v2 mitigation\nfeatures (as shown by cpuid), and if found provide that feature\nto guests, even if running on older KVM (kernel) versions which\ndo not yet expose that feature to QEMU. (bsc#1082276)\n\nThese two patches will be removed when we can reasonably assume\neveryone is running with the appropriate updates.\n\n\nAlso security fixes for the following CVE issues are included:\n\n- CVE-2017-15119: The Network Block Device (NBD) server in Quick Emulator (QEMU), was vulnerable to a denial of service issue. It could occur if a client sent large option requests, making the server waste CPU time on reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other requests, resulting in DoS. (bsc#1070144)\n- CVE-2017-15124: VNC server implementation in Quick Emulator (QEMU) was found to be vulnerable to an unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A malicious remote VNC client could use this flaw to cause DoS to the server host. (bsc#1073489)\n- CVE-2017-16845: The PS2 driver in Qemu did not validate 'rptr' and 'count' values during guest migration, leading to out-of-bounds access. (bsc#1068613)\n- CVE-2017-17381: The Virtio Vring implementation in QEMU allowed local OS guest users to cause a denial of service (divide-by-zero error and QEMU process crash) by unsetting vring alignment while updating Virtio rings. (bsc#1071228)\n- CVE-2017-18030: A problem in the Cirrus driver in Qemu allowed local OS guest privileged users to cause a denial of service (out-of-bounds array access and QEMU process crash) via vectors related to negative pitch. (bsc#1076179)\n- CVE-2017-18043: Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allowed a user to cause a denial of service (Qemu process crash). (bsc#1076775)\n- CVE-2018-5683: The VGA driver in Qemu allowed local OS guest privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) by leveraging improper memory address validation. (bsc#1076114)\n- CVE-2018-7550: The multiboot functionality in Quick Emulator (aka QEMU) allowed local guest OS users to execute arbitrary code on the QEMU host via an out-of-bounds read or write memory access. (bsc#1083291)  \n\nAlso the following bugs were fixed:\n\n- Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which we've\n  carried since the initial Spectre v2 patch was added. EDX bit\n  27 of CPUID Leaf 07H, Sub-leaf 0 provides status on STIBP, and\n  not the PRED_CMD MSR. Exposing the STIBP CPUID feature bit to the\n  guest is wrong in general, since the VM doesn't directly control\n  the scheduling of physical hyperthreads. This is left strictly to\n  the L0 hypervisor.\n\n- Spectre fixes for IBM Z series by providing more hw features to guests\n  (bsc#1076814)\n- Pre-add group kvm for qemu-tools (bsc#1040202)\n- the qemu-tools package also needs a prerequire of group management\n  tools, from the shadow package. (bsc#1085598)\n\n\n","status":"published","published":"2018-03-27T14:28:56Z","modified":"2026-02-04T03:59:03.989751Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:1077-1","title":"Security update for kvm","description":"This update for kvm fixes the following issues:\n\n- This update has the next round of Spectre v2 related patches,\n  which now integrates with corresponding changes in libvirt. A\n  January 2018 release of qemu initially addressed the Spectre v2\n  vulnerability for KVM guests by exposing the spec-ctrl feature\n  for all x86 vcpu types, which was the quick and dirty approach,\n  but not the proper solution. We remove that initial patch and now\n  rely on patches from upstream. This update defines spec_ctrl and\n  ibpb cpu feature flags as well as new cpu models which are clones\n  of existing models with either -IBRS or -IBPB added to the end of\n  the model name. These new vcpu models explicitly include the new\n  feature(s), whereas the feature flags can be added to the cpu\n  parameter as with other features. In short, for continued Spectre\n  v2 protection, ensure that either the appropriate cpu feature\n  flag is added to the QEMU command-line, or one of the new cpu\n  models is used. Although migration from older versions is\n  supported, the new cpu features won't be properly exposed to the\n  guest until it is restarted with the cpu features explicitly\n  added. A reboot is insufficient.\n- A warning patch is added which attempts to detect a migration\n  from a qemu version which had the quick and dirty fix (it only\n  detects certain cases, but hopefully is helpful.)\n  For additional information on Spectre v2 as it relates to QEMU,\n  see: https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/\n  (CVE-2017-5715 bsc#1068032)\n- A patch is added to continue to detect Spectre v2 mitigation\n  features (as shown by cpuid), and if found provide that feature\n  to guests, even if running on older KVM (kernel) versions which\n  do not yet expose that feature to QEMU. (bsc#1082276)\n  These two patches will be removed when we can reasonably assume\n  everyone is running with the appropriate updates.\n\n- Security fixes for the following CVE issues:\n  (bsc#1076114 CVE-2018-5683)\n  (bsc#1083291 CVE-2018-7550)\n- This patch is already included, add here for CVE track\n  (bsc#1076179 CVE-2017-18030)\n\n- Toolchain changes have cause the built size of pxe-virtio.rom to\n  exceed 64K. Tweak rarely used strings in code to reduce size of\n  the binary so it fits again.\n\n- Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which we've\n  carried since the initial Spectre v2 patch was added. EDX bit\n  27 of CPUID Leaf 07H, Sub-leaf 0 provides status on STIBP, and\n  not the PRED_CMD MSR. Exposing the STIBP CPUID feature bit to the\n  guest is wrong in general, since the VM doesn't directly control\n  the scheduling of physical hyperthreads. This is left strictly to\n  the L0 hypervisor.\n","status":"published","published":"2018-04-25T12:14:56Z","modified":"2026-02-04T02:16:27.890731Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:1177-1","title":"Security update for xen","description":"This update for xen fixes several issues.\n\nThese security issues were fixed:\n\n- CVE-2018-8897: Prevent mishandling of debug exceptions on x86 (XSA-260, bsc#1090820)\n- Handle HPET timers in IO-APIC mode correctly to prevent malicious or buggy\n  HVM guests from causing a hypervisor crash or potentially privilege\n  escalation/information leaks (XSA-261, bsc#1090822)\n- Prevent unbounded loop, induced by qemu allowing an attacker to permanently\n  keep a physical CPU core busy (XSA-262, bsc#1090823)\n- CVE-2018-10472: x86 HVM guest OS users (in certain configurations) were able\n  to read arbitrary dom0 files via QMP live insertion of a CDROM, in conjunction\n  with specifying the target file as the backing file of a snapshot\n  (bsc#1089152).\n- CVE-2018-10471: x86 PV guest OS users were able to cause a denial of service\n  (out-of-bounds zero write and hypervisor crash) via unexpected INT 80\n  processing, because of an incorrect fix for CVE-2017-5754 (bsc#1089635).\n- CVE-2018-7550: The load_multiboot function allowed local guest OS users to\n  execute arbitrary code on the host via a mh_load_end_addr value greater than\n  mh_bss_end_addr, which triggers an out-of-bounds read or write memory access\n  (bsc#1083292).\n\nThis non-security issue was fixed:\n\n- bsc#1072834: Prevent unchecked MSR access error\n- bsc#1057493: Prevent DomU crashes\n- bsc#1086107: Fixed problems with backports for XSA-246 and XSA-247\n  ","status":"published","published":"2018-05-09T11:30:52Z","modified":"2026-02-04T04:30:09.282807Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:1181-1","title":"Security update for xen","description":"This update for xen fixes several issues.\n\nThese security issues were fixed:\n\n- CVE-2018-8897: Prevent mishandling of debug exceptions on x86 (XSA-260, bsc#1090820)\n- Handle HPET timers in IO-APIC mode correctly to prevent malicious or buggy\n  HVM guests from causing a hypervisor crash or potentially privilege\n  escalation/information leaks (XSA-261, bsc#1090822)\n- Prevent unbounded loop, induced by qemu allowing an attacker to permanently\n  keep a physical CPU core busy (XSA-262, bsc#1090823)\n- CVE-2018-10472: x86 HVM guest OS users (in certain configurations) were able\n  to read arbitrary dom0 files via QMP live insertion of a CDROM, in conjunction\n  with specifying the target file as the backing file of a snapshot\n  (bsc#1089152).\n- CVE-2018-10471: x86 PV guest OS users were able to cause a denial of service\n  (out-of-bounds zero write and hypervisor crash) via unexpected INT 80\n  processing, because of an incorrect fix for CVE-2017-5754 (bsc#1089635).\n- CVE-2018-7550: The load_multiboot function allowed local guest OS users to\n  execute arbitrary code on the host via a mh_load_end_addr value greater than\n  mh_bss_end_addr, which triggers an out-of-bounds read or write memory access\n  (bsc#1083292).\n\nThese non-security issues were fixed:\n\n- bsc#1072834: Prevent unchecked MSR access error\n- bsc#1035442: Increase the value of LIBXL_DESTROY_TIMEOUT from 10 to 100\n  seconds, allowing for more domUs to be shutdown in parallel\n- bsc#1057493: Prevent DomU crash\n\n  ","status":"published","published":"2018-05-09T11:31:36Z","modified":"2026-02-04T02:32:08.710451Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"SUSE-SU-2018:1202-1","title":"Security update for xen","description":"This update for xen fixes several issues.\n\nThese security issues were fixed:\n\n- CVE-2018-8897: Prevent mishandling of debug exceptions on x86 (XSA-260, bsc#1090820)\n- Handle HPET timers in IO-APIC mode correctly to prevent malicious or buggy\n  HVM guests from causing a hypervisor crash or potentially privilege\n  escalation/information leaks (XSA-261, bsc#1090822)\n- Prevent unbounded loop, induced by qemu allowing an attacker to permanently\n  keep a physical CPU core busy (XSA-262, bsc#1090823)\n- CVE-2018-10472: x86 HVM guest OS users (in certain configurations) were able\n  to read arbitrary dom0 files via QMP live insertion of a CDROM, in conjunction\n  with specifying the target file as the backing file of a snapshot\n  (bsc#1089152).\n- CVE-2018-10471: x86 PV guest OS users were able to cause a denial of service\n  (out-of-bounds zero write and hypervisor crash) via unexpected INT 80\n  processing, because of an incorrect fix for CVE-2017-5754 (bsc#1089635).\n- CVE-2018-7550: The load_multiboot function allowed local guest OS users to\n  execute arbitrary code on the host via a mh_load_end_addr value greater than\n  mh_bss_end_addr, which triggers an out-of-bounds read or write memory access\n  (bsc#1083292).\n  ","status":"published","published":"2018-05-10T10:43:03Z","modified":"2026-02-04T04:23:51.255159Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"SUSE-SU-2018:1203-1","title":"Security update for xen","description":"This update for xen fixes several issues.\n\nThese security issues were fixed:\n\n- CVE-2018-8897: Prevent mishandling of debug exceptions on x86 (XSA-260, bsc#1090820)\n- Handle HPET timers in IO-APIC mode correctly to prevent malicious or buggy\n  HVM guests from causing a hypervisor crash or potentially privilege\n  escalation/information leaks (XSA-261, bsc#1090822)\n- Prevent unbounded loop, induced by qemu allowing an attacker to permanently\n  keep a physical CPU core busy (XSA-262, bsc#1090823)\n- CVE-2018-10472: x86 HVM guest OS users (in certain configurations) were able\n  to read arbitrary dom0 files via QMP live insertion of a CDROM, in conjunction\n  with specifying the target file as the backing file of a snapshot\n  (bsc#1089152).\n- CVE-2018-10471: x86 PV guest OS users were able to cause a denial of service\n  (out-of-bounds zero write and hypervisor crash) via unexpected INT 80\n  processing, because of an incorrect fix for CVE-2017-5754 (bsc#1089635).\n- CVE-2018-7550: The load_multiboot function allowed local guest OS users to\n  execute arbitrary code on the host via a mh_load_end_addr value greater than\n  mh_bss_end_addr, which triggers an out-of-bounds read or write memory access\n  (bsc#1083292).\n  ","status":"published","published":"2018-05-10T15:10:54Z","modified":"2026-02-04T03:47:51.690288Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"SUSE-SU-2018:1308-1","title":"Security update for kvm","description":"\n  \nThis update for kvm fixes the following issues:\n\nThis update has the next round of Spectre v2 related patches,\nwhich now integrates with corresponding changes in libvirt. A\nJanuary 2018 release of qemu initially addressed the Spectre v2\nvulnerability for KVM guests by exposing the spec-ctrl feature\nfor all x86 vcpu types, which was the quick and dirty approach,\nbut not the proper solution. We remove that initial patch and now\nrely on patches from upstream. This update defines spec_ctrl and\nibpb cpu feature flags as well as new cpu models which are clones\nof existing models with either -IBRS or -IBPB added to the end of\nthe model name. These new vcpu models explicitly include the new\nfeature(s), whereas the feature flags can be added to the cpu\nparameter as with other features. In short, for continued Spectre\nv2 protection, ensure that either the appropriate cpu feature\nflag is added to the QEMU command-line, or one of the new cpu\nmodels is used. Although migration from older versions is\nsupported, the new cpu features won't be properly exposed to the\nguest until it is restarted with the cpu features explicitly\nadded. A reboot is insufficient.\n\nA warning patch is added which attempts to detect a migration\nfrom a qemu version which had the quick and dirty fix (it only\ndetects certain cases, but hopefully is helpful.)\n\nFor additional information on Spectre v2 as it relates to QEMU,\nsee:\n\thttps://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/\n\n(CVE-2017-5715 bsc#1068032)\n\nA patch is added to continue to detect Spectre v2 mitigation\nfeatures (as shown by cpuid), and if found provide that feature\nto guests, even if running on older KVM (kernel) versions which\ndo not yet expose that feature to QEMU. (bsc#1082276)\n\nAdditional security fixes:\n\n- CVE-2018-5683: An out-of-bounds read in vga_draw_text routine was fixed which could lead to crashes or information leakage. (bsc#1076114)\n- CVE-2018-7550: multiboot OOB access while loading kernel image was fixed that could lead to crashes (bsc#1083291)\n- CVE-2017-18030: An out-of-bounds access in cirrus_invalidate_region routine could lead to crashes or information leakage (bsc#1076179)\n\n- Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which we've\n  carried since the initial Spectre v2 patch was added. EDX bit\n  27 of CPUID Leaf 07H, Sub-leaf 0 provides status on STIBP, and\n  not the PRED_CMD MSR. Exposing the STIBP CPUID feature bit to the\n  guest is wrong in general, since the VM doesn't directly control\n  the scheduling of physical hyperthreads. This is left strictly to\n  the L0 hypervisor.\n","status":"published","published":"2018-05-16T13:59:32Z","modified":"2026-02-04T03:20:01.048225Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"SUSE-SU-2018:2340-1","title":"Security update for qemu","description":"This update for qemu to version 2.11.2 fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2018-11806: Fix heap buffer overflow issue that can happen while reassembling fragmented datagrams (bsc#1096223).\n- CVE-2018-3639: Mitigation functionality for Speculative Store Bypass issue in x86 (bsc#1087082).\n- CVE-2018-7550: Fix out of bounds read and write memory access, potentially leading to code execution (bsc#1083291)\n\nBug fixes:\n\n- bsc#1091695: SEV guest will not lauchh with  qemu-system-x86_64 version 2.11.1.\n- bsc#1094898: qemu-guest-agent service doesn't work in version Leap 15.0.\n- bsc#1094725: `virsh blockresize` does not work with Xen qdisks.\n- bsc#1094913: QEMU crashes when starting a guest with more than 7.999TB.\n","status":"published","published":"2018-08-15T13:45:55Z","modified":"2026-02-04T04:06:31.478313Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"USN-3649-1","title":"qemu vulnerabilities","description":"Cyrille Chatras discovered that QEMU incorrectly handled certain PS2 values\nduring migration. An attacker could possibly use this issue to cause QEMU\nto crash, resulting in a denial of service, or possibly execute arbitrary\ncode. This issue only affected Ubuntu 18.04 LTS. (CVE-2017-16845)\n\nCyrille Chatras discovered that QEMU incorrectly handled multiboot. An\nattacker could use this issue to cause QEMU to crash, resulting in a denial\nof service, or possibly execute arbitrary code on the host. In the default\ninstallation, when QEMU is used with libvirt, attackers would be isolated\nby the libvirt AppArmor profile. (CVE-2018-7550)\n\nRoss Lagerwall discovered that QEMU incorrectly handled the Cirrus VGA\ndevice. A privileged attacker inside the guest could use this issue to\ncause QEMU to crash, resulting in a denial of service. This issue only\naffected Ubuntu 17.10 and Ubuntu 18.04 LTS. (CVE-2018-7858)\n","status":"published","published":"2018-05-16T12:03:54Z","modified":"2026-02-10T04:41:20Z","updated_at":"2026-11-02T16:58:13.496563Z"}]}}