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USN-5091-3

USN-5091-3 · linux-azure, linux-azure-5.4 regression

This page contains facts from public vulnerability sources. Check the original advisory before updating.

USN-5091-1 fixed vulnerabilities in Linux 5.4-based kernels. Unfortunately, for Linux kernels intended for use within Microsoft Azure environments, that update introduced a regression that could cause the kernel to fail to boot in large Azure instance types. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. (CVE-2021-33624) It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679) Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576) It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160) Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199) It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204)

Fix available

Published
Updated

Stack: system

Affected products and versions

  • linux-azure-5.4 Ubuntu:18.04:LTS

    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
    • 5.4.0-1044.46~18.04.1
    • 5.4.0-1046.48~18.04.1
    • 5.4.0-1047.49~18.04.1
    • 5.4.0-1048.50~18.04.1
    • 5.4.0-1049.51~18.04.1
    • 5.4.0-1051.53~18.04.1
    • 5.4.0-1055.57~18.04.1
    • 5.4.0-1056.58~18.04.1
    • 5.4.0-1058.60~18.04.1
    • 5.4.0-1059.62~18.04.1
    Affected ranges
    • ECOSYSTEM: < 5.4.0-1061.64~18.04.1

    Update to 5.4.0-1061.64~18.04.1

  • linux-azure Ubuntu:20.04:LTS

    Versions
    • 5.3.0-1003.3
    • 5.3.0-1008.9
    • 5.3.0-1009.10
    • 5.4.0-1006.6
    • 5.4.0-1008.8
    • 5.4.0-1009.9
    • 5.4.0-1010.10
    • 5.4.0-1012.12
    • 5.4.0-1016.16
    • 5.4.0-1019.19
    • 5.4.0-1020.20
    • 5.4.0-1022.22
    • 5.4.0-1023.23
    • 5.4.0-1025.25
    • 5.4.0-1026.26
    • 5.4.0-1031.32
    • 5.4.0-1032.33
    • 5.4.0-1034.35
    • 5.4.0-1035.36
    • 5.4.0-1036.38
    • 5.4.0-1039.41
    • 5.4.0-1040.42
    • 5.4.0-1041.43
    • 5.4.0-1043.45
    • 5.4.0-1044.46
    • 5.4.0-1046.48
    • 5.4.0-1047.49
    • 5.4.0-1048.50
    • 5.4.0-1049.51
    • 5.4.0-1051.53
    • 5.4.0-1055.57
    • 5.4.0-1056.58
    • 5.4.0-1058.60
    • 5.4.0-1059.62
    Affected ranges
    • ECOSYSTEM: < 5.4.0-1061.64

    Update to 5.4.0-1061.64

Original sources

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