{"id":"LSN-0081-1","summary":"Kernel Live Patch Security Notice","details":"Maxim Levitsky discovered that the KVM hypervisor implementation for AMD\nprocessors in the Linux kernel did not properly prevent a guest VM from\nenabling AVIC in nested guest VMs. An attacker in a guest VM could use this\nto write to portions of the host's physical memory.(CVE-2021-3653)\n\nMaxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor\nimplementation for AMD processors in the Linux kernel allowed a guest VM to\ndisable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a\nguest VM could use this to read or write portions of the host's physical\nmemory.(CVE-2021-3656)\n\nAndy Nguyen discovered that the netfilter subsystem in the Linux kernel\ncontained an out-of-bounds write in its setsockopt() implementation. A\nlocal attacker could use this to cause a denial of service (system crash)\nor possibly execute arbitrary code.(CVE-2021-22555)\n\nIt was discovered that the virtual file system implementation in the Linux\nkernel contained an unsigned to signed integer conversion error. A local\nattacker could use this to cause a denial of service (system crash) or\nexecute arbitrary code.(CVE-2021-33909)","modified":"2025-12-15T10:15:37.657510Z","published":"2021-09-13T07:12:04Z","upstream":["CVE-2021-22555","CVE-2021-33909","CVE-2021-3653","CVE-2021-3656","UBUNTU-CVE-2021-22555","UBUNTU-CVE-2021-33909","UBUNTU-CVE-2021-3653","UBUNTU-CVE-2021-3656"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/LSN-0081-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3653"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3656"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-22555"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33909"}],"affected":[{"package":{"name":"linux-lts-xenial","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/linux-lts-xenial@4.4.0-214.246~14.04.1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-214.246~14.04.1"}]}],"versions":["4.4.0-13.29~14.04.1","4.4.0-14.30~14.04.2","4.4.0-15.31~14.04.1","4.4.0-18.34~14.04.1","4.4.0-21.37~14.04.1","4.4.0-22.39~14.04.1","4.4.0-22.40~14.04.1","4.4.0-24.43~14.04.1","4.4.0-28.47~14.04.1","4.4.0-31.50~14.04.1","4.4.0-34.53~14.04.1","4.4.0-36.55~14.04.1","4.4.0-38.57~14.04.1","4.4.0-42.62~14.04.1","4.4.0-45.66~14.04.1","4.4.0-47.68~14.04.1","4.4.0-51.72~14.04.1","4.4.0-53.74~14.04.1","4.4.0-57.78~14.04.1","4.4.0-59.80~14.04.1","4.4.0-62.83~14.04.1","4.4.0-63.84~14.04.2","4.4.0-64.85~14.04.1","4.4.0-66.87~14.04.1","4.4.0-67.88~14.04.1","4.4.0-70.91~14.04.1","4.4.0-71.92~14.04.1","4.4.0-72.93~14.04.1","4.4.0-75.96~14.04.1","4.4.0-78.99~14.04.2","4.4.0-79.100~14.04.1","4.4.0-81.104~14.04.1","4.4.0-83.106~14.04.1","4.4.0-87.110~14.04.1","4.4.0-89.112~14.04.1","4.4.0-91.114~14.04.1","4.4.0-92.115~14.04.1","4.4.0-93.116~14.04.1","4.4.0-96.119~14.04.1","4.4.0-97.120~14.04.1","4.4.0-98.121~14.04.1","4.4.0-101.124~14.04.1","4.4.0-103.126~14.04.1","4.4.0-104.127~14.04.1","4.4.0-108.131~14.04.1","4.4.0-109.132~14.04.1","4.4.0-111.134~14.04.1","4.4.0-112.135~14.04.1","4.4.0-116.140~14.04.1","4.4.0-119.143~14.04.1","4.4.0-121.145~14.04.1","4.4.0-124.148~14.04.1","4.4.0-127.153~14.04.1","4.4.0-128.154~14.04.1","4.4.0-130.156~14.04.1","4.4.0-131.157~14.04.1","4.4.0-133.159~14.04.1","4.4.0-134.160~14.04.1","4.4.0-135.161~14.04.1","4.4.0-137.163~14.04.1","4.4.0-138.164~14.04.1","4.4.0-139.165~14.04.1","4.4.0-140.166~14.04.1","4.4.0-141.167~14.04.1","4.4.0-142.168~14.04.1","4.4.0-143.169~14.04.2","4.4.0-144.170~14.04.1","4.4.0-146.172~14.04.1","4.4.0-148.174~14.04.1","4.4.0-150.176~14.04.1","4.4.0-151.178~14.04.1","4.4.0-154.181~14.04.1","4.4.0-157.185~14.04.1","4.4.0-159.187~14.04.1","4.4.0-161.189~14.04.1","4.4.0-164.192~14.04.1","4.4.0-165.193~14.04.1","4.4.0-166.195~14.04.1","4.4.0-168.197~14.04.1","4.4.0-169.198~14.04.1","4.4.0-170.199~14.04.1","4.4.0-171.200~14.04.1","4.4.0-173.203~14.04.1","4.4.0-174.204~14.04.1","4.4.0-176.206~14.04.1","4.4.0-177.207~14.04.1","4.4.0-178.208~14.04.1","4.4.0-179.209~14.04.1","4.4.0-184.214~14.04.1","4.4.0-185.215~14.04.1","4.4.0-186.216~14.04.1","4.4.0-187.217~14.04.1","4.4.0-189.219~14.04.1","4.4.0-190.220~14.04.1","4.4.0-193.224~14.04.1","4.4.0-194.226~14.04.1","4.4.0-197.229~14.04.1","4.4.0-198.230~14.04.1","4.4.0-200.232~14.04.1","4.4.0-201.233~14.04.1","4.4.0-203.235~14.04.1","4.4.0-204.236~14.04.1","4.4.0-206.238~14.04.1","4.4.0-208.240~14.04.1","4.4.0-209.241~14.04.1","4.4.0-210.242~14.04.1","4.4.0-211.243~14.04.1","4.4.0-212.244~14.04.1","4.4.0-213.245~14.04.1"],"ecosystem_specific":{"module_name_regex":"lkp_Ubuntu_4_4_0[_|\\d]+_(?:generic|lowlatency)_(\\d+)","availability":"Livepatch 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