{"schemaVersion":3,"id":"USN-4887-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.3, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe, linux-hwe-5.4, linux-hwe-5.8, linux-kvm, linux-oem-5.10, linux-oem-5.6, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux-raspi2-5.3 vulnerabilities\n\nDe4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux\nkernel did not properly handle mod32 destination register truncation when\nthe source register was known to be 0. A local attacker could use this to\nexpose sensitive information (kernel memory) or possibly execute arbitrary\ncode. (CVE-2021-3444)\n\nAdam Nichols discovered that heap overflows existed in the iSCSI subsystem\nin the Linux kernel. A local attacker could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code. (CVE-2021-27365)\n\nPiotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not\nproperly compute a speculative execution limit on pointer arithmetic in\nsome situations. A local attacker could use this to expose sensitive\ninformation (kernel memory). (CVE-2020-27171)\n\nPiotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not\nproperly apply speculative execution limits on some pointer types. A local\nattacker could use this to expose sensitive information (kernel memory).\n(CVE-2020-27170)\n\nAdam Nichols discovered that the iSCSI subsystem in the Linux kernel did\nnot properly restrict access to iSCSI transport handles. A local attacker\ncould use this to cause a denial of service or expose sensitive information\n(kernel pointer addresses). (CVE-2021-27363)\n\nAdam Nichols discovered that an out-of-bounds read existed in the iSCSI\nsubsystem in the Linux kernel. A local attacker could use this to cause a\ndenial of service (system crash) or expose sensitive information (kernel\nmemory). (CVE-2021-27364)","dates":{"published":"2021-03-23T21:57:53.000Z","modified":"2026-06-03T13:33:57.218Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"linux","name":"linux","label":"linux","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux","purlType":"deb","versions":[{"text":"< 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5.3.0-1038.40","eol":null,"hubHref":null}],"affectedCount":22,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4887-1","label":"ubuntu.com/security/notices/USN-4887-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-27170","label":"ubuntu.com/security/CVE-2020-27170","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-27171","label":"ubuntu.com/security/CVE-2020-27171","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-3444","label":"ubuntu.com/security/CVE-2021-3444","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-27363","label":"ubuntu.com/security/CVE-2021-27363","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-27364","label":"ubuntu.com/security/CVE-2021-27364","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-27365","label":"ubuntu.com/security/CVE-2021-27365","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-27170","CVE-2020-27171","CVE-2021-27363","CVE-2021-27364","CVE-2021-27365","CVE-2021-3444"],"downstream":[],"duplicates":[],"related":["CVE-2020-27170","CVE-2020-27171","CVE-2021-27363","CVE-2021-27364","CVE-2021-27365","CVE-2021-3444"]},"timeline":[{"kind":"published","date":"2021-03-23T21:57:53.000Z","label":"Published","detail":"Vulnerability 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