The remote Ubuntu 21.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4997-2 advisory.

    USN-4997-1 fixed vulnerabilities in the Linux kernel for Ubuntu 21.04. This update provides the     corresponding updates for the Linux KVM kernel for Ubuntu 21.04.

    Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel     leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute     arbitrary code. (CVE-2021-3609)

    Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits     for pointer operations. A local attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-33200)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation did not properly clear received     fragments from memory in some situations. A physically proximate attacker could possibly use this issue to     inject packets or expose sensitive information. (CVE-2020-24586)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation incorrectly handled encrypted     fragments. A physically proximate attacker could possibly use this issue to decrypt fragments.
    (CVE-2020-24587)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation incorrectly handled certain     malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate     attacker could use this issue to inject packets. (CVE-2020-24588)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation incorrectly handled EAPOL frames     from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a     denial of service (system crash). (CVE-2020-26139)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation did not properly verify certain     fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt     packets. (CVE-2020-26141)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation accepted plaintext fragments in     certain situations. A physically proximate attacker could use this issue to inject packets.
    (CVE-2020-26145)

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation could reassemble mixed encrypted     and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets     or exfiltrate selected fragments. (CVE-2020-26147)

    Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some     situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)

    Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux     kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2021-23134)

    Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel     contained an out-of-bounds vulnerability. A local attacker could use this issue to execute arbitrary code.
    (CVE-2021-31440)

    Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent     speculative loads in certain situations. A local attacker could use this to expose sensitive information     (kernel memory). (CVE-2021-31829)

    It was discovered that a race condition in the kernel Bluetooth subsystem could lead to use-after-free of     slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399)

    It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2021-33034)

    It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux     kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506)

    Mathias Krause discovered that a null pointer dereference existed in the Nitro Enclaves kernel driver of     the Linux kernel. A local attacker could use this issue to cause a denial of service or possibly execute     arbitrary code. (CVE-2021-3543)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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Ubuntu 21.04 : Linux kernel (KVM) vulnerabilities (USN-4997-2)

high Nessus Plugin ID 153127

Version 1.6