{"id":"USN-5210-2","aliases":[],"status":"published","title":"linux, linux-gcp, linux-gcp-5.4, linux-hwe-5.4 regression","description":"USN-5210-1 fixed vulnerabilities in the Linux kernel. Unfortunately,\nthat update introduced a regression that caused failures to boot in\nenvironments with AMD Secure Encrypted Virtualization (SEV) enabled.\nThis update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Nadav Amit discovered that the hugetlb implementation in the Linux kernel\n did not perform TLB flushes under certain conditions. A local attacker\n could use this to leak or alter data from other processes that use huge\n pages. (CVE-2021-4002)\n\n It was discovered that the Linux kernel did not properly enforce certain\n types of entries in the Secure Boot Forbidden Signature Database (aka dbx)\n protection mechanism. An attacker could use this to bypass UEFI Secure Boot\n restrictions. (CVE-2020-26541)\n\n It was discovered that a race condition existed in the overlay file system\n implementation in the Linux kernel. A local attacker could use this to\n cause a denial of service (system crash). (CVE-2021-20321)\n\n It was discovered that the NFC subsystem in the Linux kernel contained a\n use-after-free vulnerability in its NFC Controller Interface (NCI)\n implementation. A local attacker could possibly use this to cause a denial\n of service (system crash) or execute arbitrary code. (CVE-2021-3760)\n\n It was discovered that an integer overflow could be triggered in the eBPF\n implementation in the Linux kernel when preallocating objects for stack\n maps. A privileged local attacker could use this to cause a denial of\n service or possibly execute arbitrary code. (CVE-2021-41864)\n\n It was discovered that the KVM implementation for POWER8 processors in the\n Linux kernel did not properly keep track if a wakeup event could be\n resolved by a guest. An attacker in a guest VM could possibly use this to\n cause a denial of service (host OS crash). (CVE-2021-43056)\n\n It was discovered that the ISDN CAPI implementation in the Linux kernel\n contained a race condition in certain situations that could trigger an\n array out-of-bounds bug. A privileged local attacker could possibly use\n this to cause a denial of service or execute arbitrary code.\n (CVE-2021-43389)","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2022-01-12T21:06:02Z","modified":"2026-04-22T10:19:55Z","fixes":[{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-gcp-5.4","fixed_in":["5.4.0-1060.64~18.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-hwe-5.4","fixed_in":["5.4.0-94.106~18.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux","fixed_in":["5.4.0-94.106"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-gcp","fixed_in":["5.4.0-1060.64"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-gcp-5.4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-1060.64~18.04.1"}]}],"versions":["5.4.0-1019.19~18.04.2","5.4.0-1021.21~18.04.1","5.4.0-1022.22~18.04.1","5.4.0-1024.24~18.04.1","5.4.0-1025.25~18.04.1","5.4.0-1028.29~18.04.1","5.4.0-1029.31~18.04.1","5.4.0-1030.32~18.04.1","5.4.0-1032.34~18.04.1","5.4.0-1033.35~18.04.1","5.4.0-1034.37~18.04.1","5.4.0-1036.39~18.04.1","5.4.0-1037.40~18.04.1","5.4.0-1038.41~18.04.1","5.4.0-1040.43~18.04.1","5.4.0-1041.44~18.04.1","5.4.0-1042.45~18.04.1","5.4.0-1043.46~18.04.1","5.4.0-1044.47~18.04.2","5.4.0-1046.49~18.04.1","5.4.0-1049.53~18.04.1","5.4.0-1051.55~18.04.1","5.4.0-1052.56~18.04.1","5.4.0-1053.57~18.04.1","5.4.0-1055.59~18.04.1","5.4.0-1056.60~18.04.1","5.4.0-1057.61~18.04.1","5.4.0-1058.62~18.04.1","5.4.0-1059.63~18.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-hwe-5.4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-94.106~18.04.1"}]}],"versions":["5.4.0-37.41~18.04.1","5.4.0-39.43~18.04.1","5.4.0-40.44~18.04.1","5.4.0-42.46~18.04.1","5.4.0-45.49~18.04.2","5.4.0-47.51~18.04.1","5.4.0-48.52~18.04.1","5.4.0-51.56~18.04.1","5.4.0-52.57~18.04.1","5.4.0-53.59~18.04.1","5.4.0-54.60~18.04.1","5.4.0-56.62~18.04.1","5.4.0-58.64~18.04.1","5.4.0-59.65~18.04.1","5.4.0-60.67~18.04.1","5.4.0-62.70~18.04.1","5.4.0-64.72~18.04.1","5.4.0-65.73~18.04.1","5.4.0-66.74~18.04.2","5.4.0-67.75~18.04.1","5.4.0-70.78~18.04.1","5.4.0-71.79~18.04.1","5.4.0-72.80~18.04.1","5.4.0-73.82~18.04.1","5.4.0-74.83~18.04.1","5.4.0-77.86~18.04.1","5.4.0-80.90~18.04.1","5.4.0-81.91~18.04.1","5.4.0-84.94~18.04.1","5.4.0-86.97~18.04.1","5.4.0-87.98~18.04.1","5.4.0-89.100~18.04.1","5.4.0-90.101~18.04.1","5.4.0-91.102~18.04.1","5.4.0-92.103~18.04.2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-94.106"}]}],"versions":["5.3.0-18.19","5.3.0-24.26","5.4.0-9.12","5.4.0-18.22","5.4.0-21.25","5.4.0-24.28","5.4.0-25.29","5.4.0-26.30","5.4.0-28.32","5.4.0-29.33","5.4.0-31.35","5.4.0-33.37","5.4.0-37.41","5.4.0-39.43","5.4.0-40.44","5.4.0-42.46","5.4.0-45.49","5.4.0-47.51","5.4.0-48.52","5.4.0-51.56","5.4.0-52.57","5.4.0-53.59","5.4.0-54.60","5.4.0-56.62","5.4.0-58.64","5.4.0-59.65","5.4.0-60.67","5.4.0-62.70","5.4.0-64.72","5.4.0-65.73","5.4.0-66.74","5.4.0-67.75","5.4.0-70.78","5.4.0-71.79","5.4.0-72.80","5.4.0-73.82","5.4.0-74.83","5.4.0-77.86","5.4.0-80.90","5.4.0-81.91","5.4.0-84.94","5.4.0-86.97","5.4.0-88.99","5.4.0-89.100","5.4.0-90.101","5.4.0-91.102","5.4.0-92.103"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-gcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-1060.64"}]}],"versions":["5.3.0-1004.4","5.3.0-1009.10","5.3.0-1011.12","5.4.0-1005.5","5.4.0-1007.7","5.4.0-1008.8","5.4.0-1009.9","5.4.0-1011.11","5.4.0-1015.15","5.4.0-1018.18","5.4.0-1019.19","5.4.0-1021.21","5.4.0-1022.22","5.4.0-1024.24","5.4.0-1025.25","5.4.0-1028.29","5.4.0-1029.31","5.4.0-1030.32","5.4.0-1032.34","5.4.0-1033.35","5.4.0-1034.37","5.4.0-1036.39","5.4.0-1037.40","5.4.0-1038.41","5.4.0-1040.43","5.4.0-1041.44","5.4.0-1042.45","5.4.0-1043.46","5.4.0-1044.47","5.4.0-1046.49","5.4.0-1049.53","5.4.0-1051.55","5.4.0-1052.56","5.4.0-1053.57","5.4.0-1055.59","5.4.0-1056.60","5.4.0-1057.61","5.4.0-1058.62","5.4.0-1059.63"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-5210-2","tags":["advisory"]},{"url":"https://launchpad.net/bugs/1956575","tags":["report"]}],"sources":{"osv":[{"id":"USN-5210-2","title":"linux, linux-gcp, linux-gcp-5.4, linux-hwe-5.4 regression","description":"USN-5210-1 fixed vulnerabilities in the Linux kernel. Unfortunately,\nthat update introduced a regression that caused failures to boot in\nenvironments with AMD Secure Encrypted Virtualization (SEV) enabled.\nThis update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Nadav Amit discovered that the hugetlb implementation in the Linux kernel\n did not perform TLB flushes under certain conditions. A local attacker\n could use this to leak or alter data from other processes that use huge\n pages. (CVE-2021-4002)\n\n It was discovered that the Linux kernel did not properly enforce certain\n types of entries in the Secure Boot Forbidden Signature Database (aka dbx)\n protection mechanism. An attacker could use this to bypass UEFI Secure Boot\n restrictions. (CVE-2020-26541)\n\n It was discovered that a race condition existed in the overlay file system\n implementation in the Linux kernel. A local attacker could use this to\n cause a denial of service (system crash). (CVE-2021-20321)\n\n It was discovered that the NFC subsystem in the Linux kernel contained a\n use-after-free vulnerability in its NFC Controller Interface (NCI)\n implementation. A local attacker could possibly use this to cause a denial\n of service (system crash) or execute arbitrary code. (CVE-2021-3760)\n\n It was discovered that an integer overflow could be triggered in the eBPF\n implementation in the Linux kernel when preallocating objects for stack\n maps. A privileged local attacker could use this to cause a denial of\n service or possibly execute arbitrary code. (CVE-2021-41864)\n\n It was discovered that the KVM implementation for POWER8 processors in the\n Linux kernel did not properly keep track if a wakeup event could be\n resolved by a guest. An attacker in a guest VM could possibly use this to\n cause a denial of service (host OS crash). (CVE-2021-43056)\n\n It was discovered that the ISDN CAPI implementation in the Linux kernel\n contained a race condition in certain situations that could trigger an\n array out-of-bounds bug. A privileged local attacker could possibly use\n this to cause a denial of service or execute arbitrary code.\n (CVE-2021-43389)\n","status":"published","published":"2022-01-12T21:06:02Z","modified":"2026-04-22T10:19:55.130864Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}