{"id":"USN-4909-1","summary":"linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities","details":"Loris Reiff discovered that the BPF implementation in the Linux kernel did\nnot properly validate attributes in the getsockopt BPF hook. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-20194)\n\nOlivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schönherr\ndiscovered that the Xen paravirtualization backend in the Linux kernel did\nnot properly propagate errors to frontend drivers in some situations. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26930)\n\nJan Beulich discovered that multiple Xen backends in the Linux kernel did\nnot properly handle certain error conditions under paravirtualization. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26931)\n\nIt was discovered that the network block device (nbd) driver in the Linux\nkernel contained a use-after-free vulnerability during device setup. A\nlocal attacker with access to the nbd device could use this to cause a\ndenial of service (system crash) or possibly execute arbitrary code.\n(CVE-2021-3348)\n","modified":"2026-02-10T04:42:08Z","published":"2021-04-13T21:55:19Z","related":["UBUNTU-CVE-2021-20194","UBUNTU-CVE-2021-26930","UBUNTU-CVE-2021-26931","UBUNTU-CVE-2021-3348"],"upstream":["CVE-2021-20194","CVE-2021-26930","CVE-2021-26931","CVE-2021-3348","UBUNTU-CVE-2021-20194","UBUNTU-CVE-2021-26930","UBUNTU-CVE-2021-26931","UBUNTU-CVE-2021-3348"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4909-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3348"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-20194"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26930"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26931"}],"affected":[{"package":{"name":"linux-aws-5.4","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/linux-aws-5.4@5.4.0-1043.45~18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-1043.45~18.04.1"}]}],"versions":["5.4.0-1018.18~18.04.1","5.4.0-1020.20~18.04.2","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","5.4.0-1029.30~18.04.1","5.4.0-1030.31~18.04.1","5.4.0-1032.33~18.04.1","5.4.0-1034.35~18.04.1","5.4.0-1035.37~18.04.1","5.4.0-1037.39~18.04.1","5.4.0-1038.40~18.04.1","5.4.0-1039.41~18.04.1","5.4.0-1041.43~18.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-aws-5.4-cloud-tools-5.4.0-1043"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-aws-5.4-headers-5.4.0-1043"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-aws-5.4-tools-5.4.0-1043"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-buildinfo-5.4.0-1043-aws"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-cloud-tools-5.4.0-1043-aws"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-headers-5.4.0-1043-aws"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-image-5.4.0-1043-aws"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-modules-5.4.0-1043-aws"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-modules-extra-5.4.0-1043-aws"},{"binary_version":"5.4.0-1043.45~18.04.1","binary_name":"linux-tools-5.4.0-1043-aws"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-3348","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-20194","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2021-26930","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2021-26931","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4909-1.json"}},{"package":{"name":"linux-azure-5.4","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/linux-azure-5.4@5.4.0-1044.46~18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.0-1044.46~18.04.1"}]}],"versions":["5.4.0-1020.20~18.04.1","5.4.0-1022.22~18.04.1","5.4.0-1023.23~18.04.1","5.4.0-1025.25~18.04.1","5.4.0-1026.26~18.04.1","5.4.0-1031.32~18.04.1","5.4.0-1032.33~18.04.1","5.4.0-1034.35~18.04.1","5.4.0-1035.36~18.04.1","5.4.0-1036.38~18.04.1","5.4.0-1039.41~18.04.1","5.4.0-1040.42~18.04.1","5.4.0-1041.43~18.04.1","5.4.0-1043.45~18.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-azure-5.4-cloud-tools-5.4.0-1044"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-azure-5.4-headers-5.4.0-1044"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-azure-5.4-tools-5.4.0-1044"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-buildinfo-5.4.0-1044-azure"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-cloud-tools-5.4.0-1044-azure"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-headers-5.4.0-1044-azure"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-image-unsigned-5.4.0-1044-azure"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-modules-5.4.0-1044-azure"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-modules-extra-5.4.0-1044-azure"},{"binary_version":"5.4.0-1044.46~18.04.1","binary_name":"linux-tools-5.4.0-1044-azure"}],"availability":"No 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