Advisory Published

USN-4983-1: Linux kernel (OEM) vulnerabilities

First published: Thu Jun 03 2021(Updated: )

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) Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. (CVE-2021-29155) 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) Reiji Watanabe discovered that the KVM VMX implementation in the Linux kernel did not properly prevent user space from tampering with an array index value, leading to a potential out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3501)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.10.0-1029-oem<5.10.0-1029.30
5.10.0-1029.30
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-oem-20.04<5.10.0.1029.30
5.10.0.1029.30
Ubuntu Ubuntu=20.04
All of
ubuntu/linux-image-oem-20.04b<5.10.0.1029.30
5.10.0.1029.30
Ubuntu Ubuntu=20.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this security advisory?

    The vulnerability ID for this security advisory is CVE-2021-33200.

  • What is the impact of CVE-2021-33200?

    CVE-2021-33200 can be exploited by a local attacker to cause a denial of service or execute arbitrary code.

  • What is the affected software?

    The affected software includes Ubuntu Linux kernel version 5.10.0-1029.30 and Ubuntu 20.04.

  • How can I fix CVE-2021-33200?

    To fix CVE-2021-33200, update your Ubuntu system to Linux kernel version 5.10.0-1029.30 or later.

  • Where can I find more information about this vulnerability?

    You can find more information about CVE-2021-33200 in the security advisory at Ubuntu.com.

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