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Vulnerability record · CVE-2020-26147 · published 11 May 2021

CVE-2020-26147: Linux kernel vulnerability

Linux · Linux Kernel

An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble 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.

5.4 CVSS 3.1 Medium EPSS 7.6% · top 5.7%
5.4CVSS 3.1 base score, v2 3.2
7.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble 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.

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/05/11/12 Mailing ListPatchThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf Third Party Advisory
https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing ListThird Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu Third Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63 Third Party Advisory
https://www.fragattacks.com Product
http://www.openwall.com/lists/oss-security/2021/05/11/12 Mailing ListPatchThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf Third Party Advisory
https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html Mailing ListThird Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu Third Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63 Third Party Advisory
https://www.fragattacks.com Product
https://cert-portal.siemens.com/productcert/html/ssa-019200.html
https://cert-portal.siemens.com/productcert/html/ssa-913875.html

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Source: NIST National Vulnerability Database (record CVE-2020-26147), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.