USN-4909-1

Advisory lineage Upstream: 8 Downstream: 0
Published: 13 Apr 2021, 21:55
Last modified:03 Jun 2026, 13:33

Vulnerability Summary

Overall Risk (default)
minimal
0/100
CVSS Score
No data
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

13 Apr 2021, 21:55
Published
Vulnerability first disclosed
03 Jun 2026, 13:33
Last Modified
Vulnerability information updated

Description

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Loris Reiff discovered that the BPF implementation in the Linux kernel did not properly validate attributes in the getsockopt BPF hook. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-20194) Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schönherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26930) Jan Beulich discovered that multiple Xen backends in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26931) It was discovered that the network block device (nbd) driver in the Linux kernel contained a use-after-free vulnerability during device setup. A local attacker with access to the nbd device could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3348)

Affected Systems

  • ubuntu•linux

    < 5.4.0-71.79

  • ubuntu•linux-aws

    < 5.4.0-1043.45

  • ubuntu•linux-aws-5.4

    < 5.4.0-1043.45~18.04.1

  • ubuntu•linux-azure

    < 5.4.0-1044.46

  • ubuntu•linux-azure-5.4

    < 5.4.0-1044.46~18.04.1

  • ubuntu•linux-gcp

    < 5.4.0-1041.44

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1041.44~18.04.1

  • ubuntu•linux-gke-5.4

    < 5.4.0-1040.42~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1013.14

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1013.14~18.04.1

  • ubuntu•linux-hwe-5.4

    < 5.4.0-71.79~18.04.1

  • ubuntu•linux-kvm

    < 5.4.0-1037.38

  • ubuntu•linux-oracle

    < 5.4.0-1042.45

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1042.45~18.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1033.36

  • ubuntu•linux-raspi-5.4

    < 5.4.0-1033.36~18.04.1

References (5)