{"schemaVersion":3,"id":"USN-7863-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities\n\nJean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered\nthat the Linux kernel contained insufficient branch predictor isolation\nbetween a guest and a userspace hypervisor for certain processors. This\nflaw is known as VMSCAPE. An attacker in a guest VM could possibly use this\nto expose sensitive information from the host OS. (CVE-2025-40300)\n\nSeveral security issues were discovered in the Linux kernel.\nAn attacker could possibly use these to compromise the system.\nThis update corrects flaws in the following subsystems:\n  - DMA engine subsystem;\n  - GPU drivers;\n  - HSI subsystem;\n  - Ethernet team driver;\n  - TTY drivers;\n  - Ext4 file system;\n  - Timer subsystem;\n  - DCCP (Datagram Congestion Control Protocol);\n  - IPv6 networking;\n  - NET/ROM layer;\n  - SCTP protocol;\n  - USB sound devices;\n(CVE-2021-47294, CVE-2021-47330, CVE-2023-52574, CVE-2023-52650,\nCVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150,\nCVE-2024-56767, CVE-2025-37838, CVE-2025-38352)","dates":{"published":"2025-11-06T10:05:48.000Z","modified":"2026-08-06T03:07:23.233Z","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":"< 4.4.0-274.308","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0-274.308","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-aws","name":"linux-aws","label":"linux-aws","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-aws","purlType":"deb","versions":[{"text":"< 4.4.0-1149.155","noFixRecorded":false,"fixedIn":null},{"text":"< 4.4.0-1187.202","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0-1149.155 | < 4.4.0-1187.202","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-kvm","name":"linux-kvm","label":"linux-kvm","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-kvm","purlType":"deb","versions":[{"text":"< 4.4.0-1150.161","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0-1150.161","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-lts-xenial","name":"linux-lts-xenial","label":"linux-lts-xenial","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-lts-xenial","purlType":"deb","versions":[{"text":"< 4.4.0-274.308~14.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0-274.308~14.04.1","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-7863-1","label":"ubuntu.com/security/notices/USN-7863-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-47294","label":"ubuntu.com/security/CVE-2021-47294","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-47330","label":"ubuntu.com/security/CVE-2021-47330","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-52574","label":"ubuntu.com/security/CVE-2023-52574","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-52650","label":"ubuntu.com/security/CVE-2023-52650","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-50006","label":"ubuntu.com/security/CVE-2024-50006","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-50299","label":"ubuntu.com/security/CVE-2024-50299","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-53124","label":"ubuntu.com/security/CVE-2024-53124","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-53150","label":"ubuntu.com/security/CVE-2024-53150","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-56767","label":"ubuntu.com/security/CVE-2024-56767","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-37838","label":"ubuntu.com/security/CVE-2025-37838","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-38352","label":"ubuntu.com/security/CVE-2025-38352","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-40300","label":"ubuntu.com/security/CVE-2025-40300","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2021-47294","CVE-2021-47330","CVE-2023-52574","CVE-2023-52650","CVE-2024-50006","CVE-2024-50299","CVE-2024-53124","CVE-2024-53150","CVE-2024-56767","CVE-2025-37838","CVE-2025-38352","CVE-2025-40300"],"downstream":[],"duplicates":[],"related":["CVE-2021-47294","CVE-2021-47330","CVE-2023-52574","CVE-2023-52650","CVE-2024-50006","CVE-2024-50299","CVE-2024-53124","CVE-2024-53150","CVE-2024-56767","CVE-2025-37838","CVE-2025-38352","CVE-2025-40300"]},"timeline":[{"kind":"published","date":"2025-11-06T10:05:48.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-06T03:07:23.233Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T11:52:32.536Z","stale":false,"partial":false}}