{"schemaVersion":3,"id":"USN-7939-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"linux-azure, linux-azure-5.4 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  - Cryptographic API;\n  - ACPI drivers;\n  - HSI subsystem;\n  - I3C subsystem;\n  - InfiniBand drivers;\n  - Media drivers;\n  - Network drivers;\n  - Pin controllers subsystem;\n  - AFS file system;\n  - F2FS file system;\n  - SMB network file system;\n  - Padata parallel execution mechanism;\n  - Timer subsystem;\n  - Tracing infrastructure;\n  - Memory management;\n  - Appletalk network protocol;\n  - Networking core;\n  - Netfilter;\n(CVE-2022-49026, CVE-2022-49390, CVE-2023-52854, CVE-2024-35867,\nCVE-2024-47691, CVE-2024-49935, CVE-2024-50061, CVE-2024-50067,\nCVE-2024-50095, CVE-2024-50196, CVE-2024-53090, CVE-2024-53218,\nCVE-2024-56664, CVE-2025-21727, CVE-2025-21855, CVE-2025-37838,\nCVE-2025-37958, CVE-2025-38352, CVE-2025-38666, CVE-2025-39964,\nCVE-2025-39993, CVE-2025-40018)","dates":{"published":"2025-12-16T20:58:22.000Z","modified":"2026-10-17T12:54:37.131Z","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-azure","name":"linux-azure","label":"linux-azure","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-azure","purlType":"deb","versions":[{"text":"< 5.4.0-1156.163","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.4.0-1156.163","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux-azure-5.4","name":"linux-azure-5.4","label":"linux-azure-5.4","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-azure-5.4","purlType":"deb","versions":[{"text":"< 5.4.0-1156.163~18.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.4.0-1156.163~18.04.1","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-7939-1","label":"ubuntu.com/security/notices/USN-7939-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2022-49026","label":"ubuntu.com/security/CVE-2022-49026","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2022-49390","label":"ubuntu.com/security/CVE-2022-49390","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-52854","label":"ubuntu.com/security/CVE-2023-52854","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-35867","label":"ubuntu.com/security/CVE-2024-35867","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-47691","label":"ubuntu.com/security/CVE-2024-47691","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-49935","label":"ubuntu.com/security/CVE-2024-49935","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-50061","label":"ubuntu.com/security/CVE-2024-50061","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-50067","label":"ubuntu.com/security/CVE-2024-50067","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-50095","label":"ubuntu.com/security/CVE-2024-50095","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-50196","label":"ubuntu.com/security/CVE-2024-50196","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-53090","label":"ubuntu.com/security/CVE-2024-53090","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-53218","label":"ubuntu.com/security/CVE-2024-53218","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2024-56664","label":"ubuntu.com/security/CVE-2024-56664","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-21727","label":"ubuntu.com/security/CVE-2025-21727","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-21855","label":"ubuntu.com/security/CVE-2025-21855","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-2025-37958","label":"ubuntu.com/security/CVE-2025-37958","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-2025-38666","label":"ubuntu.com/security/CVE-2025-38666","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-39964","label":"ubuntu.com/security/CVE-2025-39964","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-39993","label":"ubuntu.com/security/CVE-2025-39993","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-40018","label":"ubuntu.com/security/CVE-2025-40018","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-2022-49026","CVE-2022-49390","CVE-2023-52854","CVE-2024-35867","CVE-2024-47691","CVE-2024-49935","CVE-2024-50061","CVE-2024-50067","CVE-2024-50095","CVE-2024-50196","CVE-2024-53090","CVE-2024-53218","CVE-2024-56664","CVE-2025-21727","CVE-2025-21855","CVE-2025-37838","CVE-2025-37958","CVE-2025-38352","CVE-2025-38666","CVE-2025-39964","CVE-2025-39993","CVE-2025-40018","CVE-2025-40300"],"downstream":[],"duplicates":[],"related":["CVE-2022-49026","CVE-2022-49390","CVE-2023-52854","CVE-2024-35867","CVE-2024-47691","CVE-2024-49935","CVE-2024-50061","CVE-2024-50067","CVE-2024-50095","CVE-2024-50196","CVE-2024-53090","CVE-2024-53218","CVE-2024-56664","CVE-2025-21727","CVE-2025-21855","CVE-2025-37838","CVE-2025-37958","CVE-2025-38352","CVE-2025-38666","CVE-2025-39964","CVE-2025-39993","CVE-2025-40018","CVE-2025-40300"]},"timeline":[{"kind":"published","date":"2025-12-16T20:58:22.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-17T12:54:37.131Z","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":"2026-10-20T05:35:20.156Z","stale":false,"partial":false}}