Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel (GCP) vulnerabilities (USN-5073-2)

high Nessus Plugin ID 153476
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The remote Ubuntu host is missing one or more security updates.


The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5073-2 advisory.

- ** DISPUTED ** In drivers/char/virtio_console.c in the Linux kernel before 5.13.4, data corruption or loss can be triggered by an untrusted device that supplies a buf->len value exceeding the buffer size. NOTE:
the vendor indicates that the cited data corruption is not a vulnerability in any existing use case; the length validation was added solely for robustness in the face of anomalous host OS behavior.

- An out-of-bounds memory write flaw was found in the Linux kernel's joystick devices subsystem in versions before 5.9-rc1, in the way the user calls ioctl JSIOCSBTNMAP. This flaw allows a local user to crash the system or possibly escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2021-3612)

- A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7. (CVE-2021-3653)

- net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized. (CVE-2021-34693)

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


Update the affected packages.

See Also


Plugin Details

Severity: High

ID: 153476

File Name: ubuntu_USN-5073-2.nasl

Version: 1.5

Type: local

Agent: unix

Published: 9/18/2021

Updated: 10/12/2021

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information

CVSS Score Source: CVE-2021-38160


Risk Factor: High

Score: 7.3


Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:o:canonical:ubuntu_linux:18.04:-:lts:*:*:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:16.04:-:lts:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-image-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-image-gke:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-image-gcp-lts-18.04:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gke:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-headers-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-headers-gke:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-modules-extra-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-modules-extra-gke:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-tools-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-tools-gke:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gcp-lts-18.04:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-headers-gcp-lts-18.04:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-modules-extra-gcp-lts-18.04:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-tools-gcp-lts-18.04:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-buildinfo-4.15.0-1108-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gcp-4.15-headers-4.15.0-1108:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gcp-4.15-tools-4.15.0-1108:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gcp-headers-4.15.0-1108:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-gcp-tools-4.15.0-1108:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-headers-4.15.0-1108-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-image-4.15.0-1108-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-image-unsigned-4.15.0-1108-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-modules-4.15.0-1108-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-modules-extra-4.15.0-1108-gcp:*:*:*:*:*:*:*, p-cpe:2.3:a:canonical:ubuntu_linux:linux-tools-4.15.0-1108-gcp:*:*:*:*:*:*:*

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 9/17/2021

Vulnerability Publication Date: 6/14/2021

Reference Information

CVE: CVE-2021-34693, CVE-2021-3612, CVE-2021-38160, CVE-2021-3656, CVE-2021-3653

USN: 5073-2