Advisory Published

USN-5092-2: Linux kernel vulnerabilities

First published: Wed Sep 29 2021(Updated: )

Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. (CVE-2021-41073) Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. (CVE-2021-33624) Benedict Schlueter discovered that the BPF subsystem in the Linux kernel did not properly protect against Speculative Store Bypass (SSB) side- channel attacks in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2021-34556) Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly protect against Speculative Store Bypass (SSB) side-channel attacks in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2021-35477) It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679) It was discovered that the Option USB High Speed Mobile device driver in the Linux kernel did not properly handle error conditions. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-37159) Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576) It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160) Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199) It was discovered that the Sun RPC implementation in the Linux kernel contained an out-of-bounds access error. A remote attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38201) It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204) It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report pointer addresses in some situations. An attacker could use this information to ease the exploitation of another vulnerability. (CVE-2021-38205)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.11.0-1017-azure<5.11.0-1017.18
5.11.0-1017.18
=21.04
All of
ubuntu/linux-image-azure<5.11.0.1017.18
5.11.0.1017.18
=21.04
All of
ubuntu/linux-image-virtual-hwe-20.04<5.11.0.37.41~20.04.16
5.11.0.37.41~20.04.16
=20.04
All of
ubuntu/linux-image-azure-edge<5.11.0.1017.18~20.04.16
5.11.0.1017.18~20.04.16
=20.04
All of
ubuntu/linux-image-lowlatency-hwe-20.04<5.11.0.37.41~20.04.16
5.11.0.37.41~20.04.16
=20.04
All of
ubuntu/linux-image-5.11.0-1017-azure<5.11.0-1017.18~20.04.1
5.11.0-1017.18~20.04.1
=20.04
All of
ubuntu/linux-image-5.11.0-37-generic<5.11.0-37.41~20.04.2
5.11.0-37.41~20.04.2
=20.04
All of
ubuntu/linux-image-5.11.0-37-generic-lpae<5.11.0-37.41~20.04.2
5.11.0-37.41~20.04.2
=20.04
All of
ubuntu/linux-image-generic-hwe-20.04<5.11.0.37.41~20.04.16
5.11.0.37.41~20.04.16
=20.04
All of
ubuntu/linux-image-5.11.0-37-generic-64k<5.11.0-37.41~20.04.2
5.11.0-37.41~20.04.2
=20.04
All of
ubuntu/linux-image-5.11.0-37-lowlatency<5.11.0-37.41~20.04.2
5.11.0-37.41~20.04.2
=20.04
All of
ubuntu/linux-image-oracle<5.11.0.1019.20~20.04.12
5.11.0.1019.20~20.04.12
=20.04
All of
ubuntu/linux-image-generic-lpae-hwe-20.04<5.11.0.37.41~20.04.16
5.11.0.37.41~20.04.16
=20.04
All of
ubuntu/linux-image-generic-64k-hwe-20.04<5.11.0.37.41~20.04.16
5.11.0.37.41~20.04.16
=20.04
All of
ubuntu/linux-image-5.11.0-1019-oracle<5.11.0-1019.20~20.04.1
5.11.0-1019.20~20.04.1
=20.04

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Reference Links

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-2021-41073.

  • How does the vulnerability in the Linux kernel affect systems?

    The vulnerability in the Linux kernel could be exploited by a local attacker to execute arbitrary code.

  • Which version of the Linux kernel is affected by this vulnerability?

    The Linux kernel version 5.11.0-1017.18 and earlier are affected by this vulnerability.

  • Is there a fix available for this vulnerability?

    Yes, the remedy for this vulnerability is to update to Linux kernel version 5.11.0-1017.18 or later.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability in the Ubuntu Security Advisory at the following link: [Ubuntu Security Advisory](https://ubuntu.com/security/CVE-2021-41073).

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