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CVE-2021-46947

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues efx->xdp_tx_queue_count is initially initialized…

Published Feb 27, 2024CWE-476EPSS 0.19%

Overview

CVE-2021-46947 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues

efx->xdp_tx_queue_count is initially initialized to num_possible_cpus() and is

later used to allocate and traverse efx->xdp_tx_queues lookup array. However,

we may end up not initializing all the array slots with real queues during

probing. This results, for example, in a NULL pointer dereference, when running

"# ethtool -S <iface>", similar to below

[2570283.664955][T4126959] BUG: kernel NULL pointer dereference, address: 00000000000000f8

[2570283.681283][T4126959] #PF: supervisor read access in kernel mode

[2570283.695678][T4126959] #PF: error_code(0x0000) - not-present page

[2570283.710013][T4126959] PGD 0 P4D 0

[2570283.721649][T4126959] Oops: 0000 [#1] SMP PTI

[2570283.734108][T4126959] CPU: 23 PID: 4126959 Comm: ethtool Tainted: G O 5.10.20-cloudflare-2021.3.1 #1

[2570283.752641][T4126959] Hardware name: <redacted>

[2

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/99ba0ea616aabdc8e26259fd722503e012199a76Refgit.kernel.org/stable/c/ebeac958b690123a0b40aa61f688f2f170035fadRefgit.kernel.org/stable/c/99ba0ea616aabdc8e26259fd722503e012199a76Refgit.kernel.org/stable/c/ebeac958b690123a0b40aa61f688f2f170035fad

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46947?

CVE-2021-46947 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46947?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46947?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46947?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46947 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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