{"id":"CVE-2018-18021","aliases":["DEBIAN-CVE-2018-18021","DLA-1715-1","DSA-4313-1","EUVD-2018-9760","GHSA-6vp5-5gv4-mcqp","RHSA-2018:3656","UBUNTU-CVE-2018-18021","USN-3821-1","USN-3821-2","USN-3931-1","USN-3931-2"],"status":"published","title":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles...","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","severity":{"version":"3.0","score":7.1,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00593,"percentile":0.48653,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2018-10-07T00:00:00Z","modified":"2026-11-06T13:48:39Z","fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["4.18.10-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["4.18.10-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["4.18.10-2"],"sources":["osv"]},{"ecosystem":"Ubuntu:14.04:LTS","package":"linux-lts-xenial","fixed_in":["4.4.0-139.165~14.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux","fixed_in":["4.4.0-139.165"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-aws-hwe","fixed_in":["4.15.0-1035.37~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-hwe","fixed_in":["4.15.0-47.50~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-oracle","fixed_in":["4.15.0-1010.12~16.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-raspi2","fixed_in":["4.4.0-1100.108"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"linux-snapdragon","fixed_in":["4.4.0-1104.109"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:FIPS-updates:16.04:LTS","package":"linux-fips","fixed_in":["4.4.0-1008.10"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux","fixed_in":["4.15.0-47.50"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-oracle","fixed_in":["4.15.0-1010.12"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-raspi2","fixed_in":["4.15.0-1033.35"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.10-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.10-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.10-2"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"linux-4.9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9.144-3.1~deb8u1"}]}],"versions":["4.9.110-1~deb8u1"],"bundled":27},{"source":"osv","ecosystem":"Debian:9","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9.110-3+deb9u6"}]}],"versions":["4.9.107-1","4.9.110-1","4.9.110-2","4.9.110-3","4.9.110-3+deb9u1","4.9.110-3+deb9u2","4.9.110-3+deb9u3","4.9.110-3+deb9u4","4.9.110-3+deb9u5","4.9.30-2","4.9.30-2+deb9u1","4.9.30-2+deb9u2","4.9.30-2+deb9u2~bpo8+1","4.9.30-2+deb9u3","4.9.30-2+deb9u4","4.9.30-2+deb9u5","4.9.30-2+deb9u5~bpo8+1","4.9.47-1","4.9.51-1","4.9.51-1~bpo8+1","4.9.65-1","4.9.65-2","4.9.65-3","4.9.65-3+deb9u1","4.9.65-3+deb9u1~bpo8+1","4.9.65-3+deb9u2","4.9.65-3+deb9u2~bpo8+1","4.9.65-3~bpo8+1","4.9.80-1","4.9.80-2","4.9.82-1+deb9u2","4.9.82-1+deb9u3","4.9.82-1+deb9u3~bpo8+1","4.9.88-1","4.9.88-1+deb9u1","4.9.88-1+deb9u1~bpo8+1","4.9.88-1~bpo8+1"],"bundled":2},{"source":"osv","ecosystem":"Red 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Advisory","advisory"]},{"url":"https://usn.ubuntu.com/3931-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","web"]},{"url":"https://usn.ubuntu.com/3931-2/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-18021","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6vp5-5gv4-mcqp"},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-18021","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://access.redhat.com/articles/3714391","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1631205","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1635475","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2018/rhsa-2018_3656.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2018-17182","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-17182","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-17182","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2018-18021","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-18021","tags":["advisory","report"]},{"url":"https://ubuntu.com/security/CVE-2018-18021","tags":["report"]},{"url":"https://git.kernel.org/linus/d26c25a9d19b5976b319af528886f89cf455692d","tags":["report"]},{"url":"https://git.kernel.org/linus/2a3f93459d689d990b3ecfbe782fec89b97d3279","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3821-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-3821-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-3931-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-3931-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-10880","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-13053","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-13096","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-14609","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-14617","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-17972","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-14678","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-19824","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-3459","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-3460","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-6974","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-7221","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-7222","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-7308","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-8912","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-8980","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-9213","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2018-18021","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2018-10-07T06:00:00Z","modified":"2024-08-05T11:01:14.808Z","updated_at":"2026-11-02T14:35:11.799349Z"}],"euvd":[{"id":"EUVD-2018-9760","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2018-10-07T06:00:00Z","modified":"2024-08-05T11:01:14Z","updated_at":"2026-11-03T02:39:37.172177Z"}],"ghsa":[{"id":"GHSA-6vp5-5gv4-mcqp","title":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles...","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2022-05-14T01:14:00Z","modified":"2023-02-02T05:03:20Z","cvss":[{"version":"3.0","score":7.1,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:51:37.12522Z"}],"nvd":[{"id":"CVE-2018-18021","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2018-10-07T06:29:00.273Z","modified":"2026-06-17T01:46:41.707Z","cvss":[{"version":"3.0","score":7.1,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":3.6,"vector":"AV:L/AC:L/Au:N/C:N/I:P/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:04:42.52179Z"}],"osv":[{"id":"CVE-2018-18021","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2018-10-07T06:29:00.273Z","modified":"2026-03-15T22:19:34.304316Z","cvss":[{"version":"3.0","score":7.1,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:08.834469Z"},{"id":"DEBIAN-CVE-2018-18021","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2018-10-07T06:29:00.273Z","modified":"2026-10-23T18:03:55.631736068Z","cvss":[{"version":"3.0","score":7.1,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:30.57382Z"},{"id":"RHSA-2018:3656","title":"Red Hat Security Advisory: kernel-alt security and bug fix update","status":"published","published":"2024-09-16T01:50:30Z","modified":"2026-06-29T10:22:55Z","cvss":[{"version":"3.0","score":7,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:05.383061Z"},{"id":"UBUNTU-CVE-2018-18021","description":"arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.","status":"published","published":"2018-10-07T00:00:00Z","modified":"2026-11-06T13:48:39.802875177Z","cvss":[{"version":"3.0","score":7.1,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-06T14:21:51.912045Z"},{"id":"DLA-1715-1","title":"linux-4.9 - security update","status":"published","published":"2019-03-14T00:00:00Z","modified":"2026-03-09T01:21:20.541349Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DSA-4313-1","title":"linux - security update","status":"published","published":"2018-10-08T00:00:00Z","modified":"2026-03-09T02:09:03.383383Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"USN-3821-1","title":"linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities","description":"Wen Xu discovered that the ext4 filesystem implementation in the Linux\nkernel did not properly ensure that xattr information remained in inode\nbodies. An attacker could use this to construct a malicious ext4 image\nthat, when mounted, could cause a denial of service (system crash).\n(CVE-2018-10880)\n\nIt was discovered that the alarmtimer implementation in the Linux kernel\ncontained an integer overflow vulnerability. A local attacker could use\nthis to cause a denial of service. (CVE-2018-13053)\n\nWen Xu discovered that the f2fs filesystem implementation in the Linux\nkernel did not properly validate metadata. An attacker could use this to\nconstruct a malicious f2fs image that, when mounted, could cause a denial\nof service (system crash). (CVE-2018-13096)\n\nWen Xu and Po-Ning Tseng discovered that the btrfs filesystem\nimplementation in the Linux kernel did not properly handle relocations in\nsome situations. An attacker could use this to construct a malicious btrfs\nimage that, when mounted, could cause a denial of service (system crash).\n(CVE-2018-14609)\n\nWen Xu discovered that the HFS+ filesystem implementation in the Linux\nkernel did not properly handle malformed catalog data in some situations.\nAn attacker could use this to construct a malicious HFS+ image that, when\nmounted, could cause a denial of service (system crash). (CVE-2018-14617)\n\nJann Horn discovered that the procfs file system implementation in the\nLinux kernel did not properly restrict the ability to inspect the kernel\nstack of an arbitrary task. A local attacker could use this to expose\nsensitive information. (CVE-2018-17972)\n\nIt was discovered that the KVM implementation in the Linux kernel on ARM\n64bit processors did not properly handle some ioctls. An attacker with the\nprivilege to create KVM-based virtual machines could use this to cause a\ndenial of service (host system crash) or execute arbitrary code in the\nhost. (CVE-2018-18021)\n","status":"published","published":"2018-11-14T22:20:25Z","modified":"2026-06-03T14:03:42.702870213Z","updated_at":"2026-11-02T16:58:14.019824Z"},{"id":"USN-3821-2","title":"linux-lts-xenial, linux-aws vulnerabilities","description":"USN-3821-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04\nLTS. This update provides the corresponding updates for the Linux\nHardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu\n14.04 LTS.\n\nWen Xu discovered that the ext4 filesystem implementation in the Linux\nkernel did not properly ensure that xattr information remained in inode\nbodies. An attacker could use this to construct a malicious ext4 image\nthat, when mounted, could cause a denial of service (system crash).\n(CVE-2018-10880)\n\nIt was discovered that the alarmtimer implementation in the Linux kernel\ncontained an integer overflow vulnerability. A local attacker could use\nthis to cause a denial of service. (CVE-2018-13053)\n\nWen Xu discovered that the f2fs filesystem implementation in the Linux\nkernel did not properly validate metadata. An attacker could use this to\nconstruct a malicious f2fs image that, when mounted, could cause a denial\nof service (system crash). (CVE-2018-13096)\n\nWen Xu and Po-Ning Tseng discovered that the btrfs filesystem\nimplementation in the Linux kernel did not properly handle relocations in\nsome situations. An attacker could use this to construct a malicious btrfs\nimage that, when mounted, could cause a denial of service (system crash).\n(CVE-2018-14609)\n\nWen Xu discovered that the HFS+ filesystem implementation in the Linux\nkernel did not properly handle malformed catalog data in some situations.\nAn attacker could use this to construct a malicious HFS+ image that, when\nmounted, could cause a denial of service (system crash). (CVE-2018-14617)\n\nJann Horn discovered that the procfs file system implementation in the\nLinux kernel did not properly restrict the ability to inspect the kernel\nstack of an arbitrary task. A local attacker could use this to expose\nsensitive information. (CVE-2018-17972)\n\nIt was discovered that the KVM implementation in the Linux kernel on ARM\n64bit processors did not properly handle some ioctls. An attacker with the\nprivilege to create KVM-based virtual machines could use this to cause a\ndenial of service (host system crash) or execute arbitrary code in the\nhost. (CVE-2018-18021)\n","status":"published","published":"2018-11-14T22:36:19Z","modified":"2026-06-03T14:04:11.343665932Z","updated_at":"2026-11-02T16:58:14.019824Z"},{"id":"USN-3931-1","title":"linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle, linux-raspi2 vulnerabilities","description":"M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not\nproperly set up all arguments to an error handler callback used when\nrunning as a paravirtualized guest. An unprivileged attacker in a\nparavirtualized guest VM could use this to cause a denial of service (guest\nVM crash). (CVE-2018-14678)\n\nIt was discovered that the KVM implementation in the Linux kernel on ARM\n64bit processors did not properly handle some ioctls. An attacker with the\nprivilege to create KVM-based virtual machines could use this to cause a\ndenial of service (host system crash) or execute arbitrary code in the\nhost. (CVE-2018-18021)\n\nMathias Payer and Hui Peng discovered a use-after-free vulnerability in the\nAdvanced Linux Sound Architecture (ALSA) subsystem. A physically proximate\nattacker could use this to cause a denial of service (system crash).\n(CVE-2018-19824)\n\nShlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information\nleak in the Bluetooth implementation of the Linux kernel. An attacker\nwithin Bluetooth range could use this to expose sensitive information\n(kernel memory). (CVE-2019-3459, CVE-2019-3460)\n\nJann Horn discovered that the KVM implementation in the Linux kernel\ncontained a use-after-free vulnerability. An attacker in a guest VM with\naccess to /dev/kvm could use this to cause a denial of service (guest VM\ncrash). (CVE-2019-6974)\n\nJim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in\nthe KVM subsystem of the Linux kernel, when using nested virtual machines.\nA local attacker in a guest VM could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code in the host system.\n(CVE-2019-7221)\n\nFelix Wilhelm discovered that an information leak vulnerability existed in\nthe KVM subsystem of the Linux kernel, when nested virtualization is used.\nA local attacker could use this to expose sensitive information (host\nsystem memory to a guest VM). (CVE-2019-7222)\n\nJann Horn discovered that the eBPF implementation in the Linux kernel was\ninsufficiently hardened against Spectre V1 attacks. A local attacker could\nuse this to expose sensitive information. (CVE-2019-7308)\n\nIt was discovered that a use-after-free vulnerability existed in the user-\nspace API for crypto (af_alg) implementation in the Linux kernel. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2019-8912)\n\nIt was discovered that the Linux kernel did not properly deallocate memory\nwhen handling certain errors while reading files. A local attacker could\nuse this to cause a denial of service (excessive memory consumption).\n(CVE-2019-8980)\n\nJann Horn discovered that the mmap implementation in the Linux kernel did\nnot properly check for the mmap minimum address in some situations. A local\nattacker could use this to assist exploiting a kernel NULL pointer\ndereference vulnerability. (CVE-2019-9213)\n","status":"published","published":"2019-04-02T19:29:26Z","modified":"2026-09-07T14:06:42.876248128Z","updated_at":"2026-11-02T16:58:14.019824Z"},{"id":"USN-3931-2","title":"linux-hwe, linux-aws-hwe, linux-azure, linux-gcp, linux-oracle vulnerabilities","description":"USN-3931-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04\nLTS. This update provides the corresponding updates for the Linux\nHardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu\n16.04 LTS and for the Linux Azure kernel for Ubuntu 14.04 LTS.\n\nM. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not\nproperly set up all arguments to an error handler callback used when\nrunning as a paravirtualized guest. An unprivileged attacker in a\nparavirtualized guest VM could use this to cause a denial of service (guest\nVM crash). (CVE-2018-14678)\n\nIt was discovered that the KVM implementation in the Linux kernel on ARM\n64bit processors did not properly handle some ioctls. An attacker with the\nprivilege to create KVM-based virtual machines could use this to cause a\ndenial of service (host system crash) or execute arbitrary code in the\nhost. (CVE-2018-18021)\n\nMathias Payer and Hui Peng discovered a use-after-free vulnerability in the\nAdvanced Linux Sound Architecture (ALSA) subsystem. A physically proximate\nattacker could use this to cause a denial of service (system crash).\n(CVE-2018-19824)\n\nShlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information\nleak in the Bluetooth implementation of the Linux kernel. An attacker\nwithin Bluetooth range could use this to expose sensitive information\n(kernel memory). (CVE-2019-3459, CVE-2019-3460)\n\nJann Horn discovered that the KVM implementation in the Linux kernel\ncontained a use-after-free vulnerability. An attacker in a guest VM with\naccess to /dev/kvm could use this to cause a denial of service (guest VM\ncrash). (CVE-2019-6974)\n\nJim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in\nthe KVM subsystem of the Linux kernel, when using nested virtual machines.\nA local attacker in a guest VM could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code in the host system.\n(CVE-2019-7221)\n\nFelix Wilhelm discovered that an information leak vulnerability existed in\nthe KVM subsystem of the Linux kernel, when nested virtualization is used.\nA local attacker could use this to expose sensitive information (host\nsystem memory to a guest VM). (CVE-2019-7222)\n\nJann Horn discovered that the eBPF implementation in the Linux kernel was\ninsufficiently hardened against Spectre V1 attacks. A local attacker could\nuse this to expose sensitive information. (CVE-2019-7308)\n\nIt was discovered that a use-after-free vulnerability existed in the user-\nspace API for crypto (af_alg) implementation in the Linux kernel. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2019-8912)\n\nIt was discovered that the Linux kernel did not properly deallocate memory\nwhen handling certain errors while reading files. A local attacker could\nuse this to cause a denial of service (excessive memory consumption).\n(CVE-2019-8980)\n\nJann Horn discovered that the mmap implementation in the Linux kernel did\nnot properly check for the mmap minimum address in some situations. A local\nattacker could use this to assist exploiting a kernel NULL pointer\ndereference vulnerability. (CVE-2019-9213)\n","status":"published","published":"2019-04-02T20:50:50Z","modified":"2026-09-07T14:06:18.052198609Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}