CVE-2021-34866: Linux Kernel eBPF Type Confusion Privilege Escalation Vulnerability
First published: Thu Sep 02 2021(Updated: )
A vulnerability was found in Linux Kernel, where a type confusion problem in check_map_func_compatibility() may lead to free arbitrary kernel memory. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=5b029a32cfe4600f5e10e36b41778506b90fd4de">https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=5b029a32cfe4600f5e10e36b41778506b90fd4de</a> <a href="https://www.zerodayinitiative.com/advisories/ZDI-21-1148/">https://www.zerodayinitiative.com/advisories/ZDI-21-1148/</a>
Credit: zdi-disclosures@trendmicro.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/Kernel | <5.14 | 5.14 |
| Red Hat Kernel-devel | ||
| Linux Kernel | >=5.8<5.10.62 | |
| Linux Kernel | >=5.11<5.13.14 | |
| NetApp H410C | ||
| NetApp H410C Firmware | ||
| NetApp H300S Firmware | ||
| NetApp H300S Firmware | ||
| NetApp H500e Firmware | ||
| NetApp H500e Firmware | ||
| NetApp H700S | ||
| NetApp H700S | ||
| NetApp H300E | ||
| NetApp H300E Firmware | ||
| NetApp H500S Firmware | ||
| NetApp H500e Firmware | ||
| NetApp H700E | ||
| NetApp H700E | ||
| NetApp H410S | ||
| NetApp H410S Firmware |
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Reference Links
- https://security.netapp.com/advisory/ntap-20220217-0008/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1148/
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=5b029a32cfe4600f5e10e36b41778506b90fd4de
- https://access.redhat.com/errata/RHSA-2024:0724
- https://bugzilla.redhat.com/show_bug.cgi?id=2000457
Frequently Asked Questions
What is CVE-2021-34866?
CVE-2021-34866 is a vulnerability in the Linux Kernel that allows local attackers to escalate privileges on affected installations.
What is the severity of CVE-2021-34866?
CVE-2021-34866 has a severity value of 8.8, which is considered high.
Which software versions are affected by CVE-2021-34866?
CVE-2021-34866 affects Linux Kernel versions 5.8 to 5.10.62, and versions 5.11 to 5.13.14.
How can an attacker exploit CVE-2021-34866?
To exploit CVE-2021-34866, an attacker must first obtain the ability to execute low-privileged code on the target system.
Where can I find more information about CVE-2021-34866?
You can find more information about CVE-2021-34866 at the following references: [ZDI-21-1148](https://www.zerodayinitiative.com/advisories/ZDI-21-1148/) and [Netapp Advisory](https://security.netapp.com/advisory/ntap-20220217-0008/).
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