Advisory Published

USN-4901-1: Linux kernel (Trusty HWE) vulnerabilities

First published: Tue Apr 06 2021(Updated: )

Adam Nichols discovered that heap overflows existed in the iSCSI subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-27365) It was discovered that the LIO SCSI target implementation in the Linux kernel performed insufficient identifier checking in certain XCOPY requests. An attacker with access to at least one LUN in a multiple backstore environment could use this to expose sensitive information or modify data. (CVE-2020-28374) Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did not properly restrict access to iSCSI transport handles. A local attacker could use this to cause a denial of service or expose sensitive information (kernel pointer addresses). (CVE-2021-27363) Adam Nichols discovered that an out-of-bounds read existed in the iSCSI subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information (kernel memory). (CVE-2021-27364)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-3.13.0-185-generic<3.13.0-185.236~12.04.1
3.13.0-185.236~12.04.1
=12.04
All of
ubuntu/linux-image-generic-lts-trusty<3.13.0.185.170
3.13.0.185.170
=12.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2021-27365?

    The severity of CVE-2021-27365 is high.

  • How can a local attacker exploit CVE-2021-27365?

    A local attacker can exploit CVE-2021-27365 by causing a denial of service (system crash) or possibly executing arbitrary code through heap overflows in the iSCSI subsystem in the Linux kernel.

  • What is the remedy for CVE-2021-27365 in Ubuntu 12.04 Trusty HWE?

    The remedy for CVE-2021-27365 in Ubuntu 12.04 Trusty HWE is to update the package 'linux-image-3.13.0-185-generic' to version 3.13.0-185.236~12.04.1.

  • What other vulnerabilities are addressed in the same update as CVE-2021-27365?

    The same update also addresses CVE-2021-27363 and CVE-2021-27364.

  • Where can I find more information about CVE-2021-27365?

    You can find more information about CVE-2021-27365 on the Ubuntu Security website: [link](https://ubuntu.com/security/CVE-2021-27365).

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