high
7.8
CWE
787 125
Advisory Published
CVE Published
Updated

CVE-2021-33200

First published: Wed May 26 2021(Updated: )

A flaw was found in kernel/bpf/verifier.c in BPF in the Linux kernel. An incorrect limit is enforced for pointer arithmetic operations which can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-348.rt7.130.el8
0:4.18.0-348.rt7.130.el8
redhat/kernel<0:4.18.0-348.el8
0:4.18.0-348.el8
redhat/kernel<5.13
5.13
Linux Linux kernel>=5.4.116<5.4.123
Linux Linux kernel>=5.10.33<5.10.41
Linux Linux kernel>=5.11.17<5.12.8
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Netapp Cloud Backup
Netapp Solidfire \& Hci Management Node
Netapp Solidfire Baseboard Management Controller
All of
Netapp H300s
Netapp H300s Firmware
All of
Netapp H500s
Netapp H500s Firmware
All of
Netapp H300e
Netapp H300e Firmware
All of
Netapp H500e
Netapp H500e Firmware
All of
Netapp H700e
Netapp H700e Firmware
All of
Netapp H410s
Netapp H410s Firmware
All of
Netapp H700s
Netapp H700s Firmware
Netapp H300s Firmware
Netapp H300s
Netapp H500s Firmware
Netapp H500s
Netapp H300e Firmware
Netapp H300e
Netapp H500e Firmware
Netapp H500e
Netapp H700e Firmware
Netapp H700e
Netapp H410s Firmware
Netapp H410s
Netapp H700s Firmware
Netapp H700s
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

Remedy

The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space. For the Red Hat Enterprise Linux 7 the eBPF for unprivileged users is always disabled. For the Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command: # cat /proc/sys/kernel/unprivileged_bpf_disabled The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw. A kernel update will be required to mitigate the flaw for the root or users with CAP_SYS_ADMIN capabilities.

Remedy

https://www.openwall.com/lists/oss-security/2021/05/27/1

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