USN-4917-1

    Dashboard / Vulnerabilities / USN-4917-1

    USN-4917-1

    Published: 15 Apr 2021Last Modified: 3 Jun 2026

    Summary: 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-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux-raspi2-5.3 vulnerabilities

    Details: It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493) Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code. (CVE-2021-3492) Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)

    References: https://ubuntu.com/security/notices/USN-4917-1, https://ubuntu.com/security/CVE-2021-3492, https://ubuntu.com/security/CVE-2021-3493, https://ubuntu.com/security/CVE-2021-29154

    Affected packages

    Package

    Name: linux-aws-5.4

    Purl: pkg:deb/ubuntu/linux-aws-5.4?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5.4.0-1045.47~18.04.1

    Affected 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
    5.4.0-1043.45~18.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    USN-4917-1 | CVE-DB