high
7.1
CWE
20 119
Advisory Published
CVE Published
Updated

CVE-2021-4204: Input Validation

First published: Tue Jan 11 2022(Updated: )

An out of bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This could allow a local attacker with a special privilege to crash the system or leak kernel internal information. Reference: <a href="https://www.openwall.com/lists/oss-security/2022/01/11/4">https://www.openwall.com/lists/oss-security/2022/01/11/4</a>

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Kernel<5.8.0
Linux Kernel=5.8.0
Debian GNU/Linux=11.0
Red Hat Enterprise Linux=9.0
All of
netapp h300s firmware
netapp h300s
All of
NetApp H500S Firmware
netapp h500s
All of
netapp h700s firmware
netapp h700s
All of
netapp h410s firmware
netapp h410s
All of
netapp h410c firmware
netapp h410c
netapp h300s firmware
netapp h300s
NetApp H500S Firmware
netapp h500s
netapp h700s firmware
netapp h700s
netapp h410s firmware
netapp h410s
netapp h410c firmware
netapp h410c
debian/linux<=5.10.223-1<=5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1

Remedy

https://www.openwall.com/lists/oss-security/2022/01/11/4

Remedy

Disable unprivileged ebpf with: sudo sysctl kernel.unprivileged_bpf_disabled=1

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-4204?

    CVE-2021-4204 has been classified as a medium severity vulnerability due to its potential to crash systems or leak kernel information.

  • How do I fix CVE-2021-4204?

    To fix CVE-2021-4204, update your Linux kernel to version 5.10.223-1 or later.

  • What are the affected versions for CVE-2021-4204?

    CVE-2021-4204 affects Linux Kernel versions up to 5.8.0, and also specific versions of Debian Debian Linux and Red Hat Enterprise Linux.

  • Who can exploit CVE-2021-4204?

    CVE-2021-4204 can be exploited by a local attacker with special privileges on the affected system.

  • What type of vulnerability is CVE-2021-4204?

    CVE-2021-4204 is an out of bounds memory access vulnerability caused by improper input validation in the Linux kernel's eBPF.

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