high
7.8
CWE
416
Advisory Published
Updated

CVE-2021-4028: Use After Free

First published: Mon Oct 04 2021(Updated: )

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=5.10<5.10.71
Linux Linux kernel>=5.11<5.14.10
SUSE Linux Enterprise=15.0-sp3
SUSE Linux Enterprise=15.0-sp4
redhat/kernel-rt<0:3.10.0-1160.62.1.rt56.1203.el7
0:3.10.0-1160.62.1.rt56.1203.el7
redhat/kernel<0:3.10.0-1160.62.1.el7
0:3.10.0-1160.62.1.el7
redhat/kernel<0:3.10.0-514.101.1.el7
0:3.10.0-514.101.1.el7
redhat/kernel<0:3.10.0-693.100.1.el7
0:3.10.0-693.100.1.el7
redhat/kernel<0:3.10.0-957.94.1.el7
0:3.10.0-957.94.1.el7
redhat/kernel<0:3.10.0-1062.66.1.el7
0:3.10.0-1062.66.1.el7
redhat/kernel-rt<0:4.18.0-348.23.1.rt7.153.el8_5
0:4.18.0-348.23.1.rt7.153.el8_5
redhat/kernel<0:4.18.0-348.23.1.el8_5
0:4.18.0-348.23.1.el8_5
redhat/kernel<0:4.18.0-147.64.1.el8_1
0:4.18.0-147.64.1.el8_1
redhat/kernel-rt<0:4.18.0-193.75.1.rt13.125.el8_2
0:4.18.0-193.75.1.rt13.125.el8_2
redhat/kernel<0:4.18.0-193.75.1.el8_2
0:4.18.0-193.75.1.el8_2
redhat/kernel-rt<0:4.18.0-305.40.1.rt7.112.el8_4
0:4.18.0-305.40.1.rt7.112.el8_4
redhat/kernel<0:4.18.0-305.40.1.el8_4
0:4.18.0-305.40.1.el8_4
redhat/redhat-virtualization-host<0:4.3.22-20220330.1.el7_9
0:4.3.22-20220330.1.el7_9

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-4028?

    CVE-2021-4028 is a vulnerability in the Linux kernel's implementation of RDMA communications manager listener code.

  • How severe is CVE-2021-4028?

    CVE-2021-4028 has a severity value of 7, which is considered high.

  • What is the affected software for CVE-2021-4028?

    The affected software includes Red Hat kernel versions up to 5.15, kernel-rt versions up to 3.10.0-1160.62.1.rt56.1203.el7, and SUSE Linux Enterprise versions 15.0-sp3 and 15.0-sp4.

  • How do I fix CVE-2021-4028?

    To fix CVE-2021-4028, you need to update your Linux kernel to a version that includes the necessary patches. Refer to the vendor's security advisory for the specific kernel versions that address the vulnerability.

  • Where can I find more information about CVE-2021-4028?

    You can find more information about CVE-2021-4028 in the Red Hat bugzilla and SUSE bugzilla links provided, as well as the Red Hat security advisory.

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