CVE-2020-26143: Input Validation
A vulnerability was found in Linux kernel, where the WiFi implementations assemble fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used.
Other sources
A vulnerability was found in Linux Kernel, where the wifi implementations eassemble fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used.
Upstream patch: https://lore.kernel.org/linux-wireless/20210511180259.159598-1-johannes@sipsolutions.net/
— Red Hat
An issue was discovered in the ALFA Windows 10 driver 1030.36.604 for AWUS036ACH. The WEP, WPA, WPA2, and WPA3 implementations accept fragmented plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.
— Ubuntu
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/kernel-rtto a version that resolves this vulnerability.Fixed in 0:4.18.0-348.rt7.130.el8 - Upgrade
Upgrade
redhat/kernelto a version that resolves this vulnerability.Fixed in 0:4.18.0-348.el8
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID for this issue is CVE-2020-26143.
What is the severity level of CVE-2020-26143?
CVE-2020-26143 has a severity level of 6.5 (Medium).
Which software packages are affected by CVE-2020-26143?
The affected software packages include kernel-rt, kernel, and AWUS036H firmware version 1030.36.604.
How can CVE-2020-26143 be exploited?
CVE-2020-26143 can be exploited to inject packets and/or exfiltrate selected fragments through fragmented frames in WiFi implementations.
Are there any references for CVE-2020-26143?
Yes, you can find references for CVE-2020-26143 at the following links: [reference 1](https://lore.kernel.org/linux-wireless/20210511180259.159598-1-johannes@sipsolutions.net/), [reference 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1960497), [reference 3](https://access.redhat.com/errata/RHSA-2021:4140).