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Fencer Vulns
medium 5.4

CVE-2020-26147 json

An issue was discovered in the Linux kernel 5.8.9.

published 2021-05-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18774

cvss
5.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.6%
EPSS 7.6% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • Siemens SCALANCE W1748-1 M12 V3.0.0
  • Siemens SCALANCE W1788-1 M12 V3.0.0
  • Siemens SCALANCE W1788-2 EEC M12 V3.0.0
  • Siemens SCALANCE W1788-2 M12 V3.0.0
  • Siemens SCALANCE W1788-2IA M12 V3.0.0
  • Siemens SCALANCE W721-1 RJ45 V6.6.0
  • Siemens SCALANCE W722-1 RJ45 V6.6.0
  • Siemens SCALANCE W734-1 RJ45 V6.6.0
  • Siemens SCALANCE W734-1 RJ45 (USA) V6.6.0
  • Siemens SCALANCE W738-1 M12 V6.6.0
  • Siemens SCALANCE W748-1 M12 V6.6.0
  • Siemens SCALANCE W748-1 RJ45 V6.6.0
  • Siemens SCALANCE W761-1 RJ45 V6.6.0
  • Siemens SCALANCE W774-1 M12 EEC V6.6.0
  • Siemens SCALANCE W774-1 RJ45 V6.6.0
  • Siemens SCALANCE W774-1 RJ45 (USA) V6.6.0
  • Siemens SCALANCE W778-1 M12 V6.6.0
  • Siemens SCALANCE W778-1 M12 EEC V6.6.0
  • Siemens SCALANCE W778-1 M12 EEC (USA) V6.6.0
  • Siemens SCALANCE W786-1 RJ45 V6.6.0
  • Siemens SCALANCE W786-2 RJ45 V6.6.0
  • Siemens SCALANCE W786-2 SFP V6.6.0
  • Siemens SCALANCE W786-2IA RJ45 V6.6.0
  • Siemens SCALANCE W788-1 M12 V6.6.0
  • Siemens SCALANCE W788-1 RJ45 V6.6.0
  • Siemens SCALANCE W788-2 M12 V6.6.0
  • Siemens SCALANCE W788-2 M12 EEC V6.6.0
  • Siemens SCALANCE W788-2 RJ45 V6.6.0
  • linux Debian 14, Debian 13, Debian 12 5.10.46-1

debian advisories DEBIAN-CVE-2020-26147

  • linux Ubuntu 18.04 LTS 4.15.0-151.157
  • linux Ubuntu 20.04 LTS 5.4.0-77.86
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1109.116
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1051.53
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1046.49
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1046.48
  • linux-kvm Ubuntu 18.04 LTS 4.15.0-1097.99
  • linux-kvm Ubuntu 20.04 LTS 5.4.0-1041.42

ubuntu advisories UBUNTU-CVE-2020-26147

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 8 4.18.0-348.el8
  • perf RHEL 8 4.18.0-348.el8
  • bpftool RHEL 8 4.18.0-348.el8
  • kernel-core RHEL 8 4.18.0-348.el8
  • kernel-tools RHEL 8 4.18.0-348.el8
  • python3-perf RHEL 8 4.18.0-348.el8
  • kernel-modules RHEL 8 4.18.0-348.el8
  • kernel-zfcpdump RHEL 8 4.18.0-348.el8

red hat advisories RHSA-2021:4356RHSA-2021:4140

  • kernel-syms SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 4.4.180-94.147.1
  • kernel-source SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +3 more 4.4.180-94.147.1
  • kernel-default SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.147.1
  • kgraft-patch-SLE12-SP3_Update_40 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, OpenStack Cloud Crowbar 8 +2 more 1-4.3.1
  • kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.75.1
  • kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.75.1
  • kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.75.1
  • kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.75.1

suse advisories SUSE-SU-2021:2451-1SUSE-SU-2021:2421-1SUSE-SU-2021:2406-1SUSE-SU-2021:2208-1SUSE-SU-2021:1977-1SUSE-SU-2021:1975-1

  • kernel-64kb openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-syms openSUSE Leap 15.3 5.3.18-59.5.1
  • kernel-obs-qa openSUSE Leap 15.3 5.3.18-59.5.1
  • kernel-source openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-default openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-preempt openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-kvmsmall openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-zfcpdump openSUSE Leap 15.3 5.3.18-59.5.2

opensuse advisories openSUSE-SU-2021:1977-1openSUSE-SU-2021:1975-1openSUSE-SU-2021:0947-1openSUSE-SU-2021:0843-1

  • linux Arch Linux 5.12.9.arch1-1
  • linux-zen Arch Linux 5.12.9.zen1-1
  • linux-hardened Arch Linux 5.12.9.hardened1-1
  • linux-lts Arch Linux 5.10.42-1

arch linux advisories AVG-2031AVG-2032AVG-2033AVG-2034

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-26147 updated cvss 5.4

kernel: reassembling mixed encrypted/plaintext fragments

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-348.el8, kernel-debuginfo-common-aarch64 4.18.0-348.el8, kernel-debuginfo-common-ppc64le 4.18.0-348.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-348.el8, kernel 4.18.0-348.el8, bpftool 4.18.0-348.el8, kernel-core 4.18.0-348.el8, kernel-tools 4.18.0-348.el8, python3-perf 4.18.0-348.el8, +15 more
    fixed: vendor fix RHSA-2021:4356
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, kernel-rt-debug-modules 4.18.0-348.rt7.130.el8, kernel-rt-modules-extra 4.18.0-348.rt7.130.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-kvm 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-kvm 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, +4 more
    fixed: vendor fix RHSA-2021:4140
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-111-07 updated cvss 5.4

Siemens SCALANCE

  • Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AC0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA0) < 6.6.0
    +34 more products
    Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (USA) (6GK5734-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TA0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AC0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (USA) (6GK5774-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (6GK5778-1GY00-0TA0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (USA) (6GK5778-1GY00-0TB0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AC0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AB0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 RJ45 (6GK5788-1FC00-0AA0) < 6.6.0
    affected: fixed in V6.6.0, mitigation support.industry.siemens.com

9 more affected in the full advisory

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-22-104-04 updated cvss 5.4

Siemens SCALANCE FragAttacks

  • Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AC0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA0) < 6.6.0
    +34 more products
    Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (USA) (6GK5734-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TA0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AC0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (USA) (6GK5774-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (6GK5778-1GY00-0TA0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (USA) (6GK5778-1GY00-0TB0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AC0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AB0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 RJ45 (6GK5788-1FC00-0AA0) < 6.6.0
    affected: fixed in V6.6.0, mitigation support.industry.siemens.com

15 more affected in the full advisory

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-21-236-01 updated cvss 5.4

Hitachi ABB Power Grids TropOS

  • Hitachi Energy TropOS <= 8.9.4.8
    affected: vendor fix, mitigation “Where Wi-Fi access is required, wherever possible ensure physical access to the local area is restricted to approved staff only.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

7.60% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.4 CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
NVD 2.0 3.2 AV:A/AC:H/Au:N/C:P/I:P/A:N

Affected products

  • Siemens SCALANCE W1748-1 M12
  • Siemens SCALANCE W1788-1 M12
  • Siemens SCALANCE W1788-2 EEC M12
  • Siemens SCALANCE W1788-2 M12
  • Siemens SCALANCE W1788-2IA M12
  • Siemens SCALANCE W721-1 RJ45
  • Siemens SCALANCE W722-1 RJ45
  • Siemens SCALANCE W734-1 RJ45
  • Siemens SCALANCE W734-1 RJ45 (USA)
  • Siemens SCALANCE W738-1 M12
  • Siemens SCALANCE W748-1 M12
  • Siemens SCALANCE W748-1 RJ45
  • Siemens SCALANCE W761-1 RJ45
  • Siemens SCALANCE W774-1 M12 EEC
  • Siemens SCALANCE W774-1 RJ45
  • Siemens SCALANCE W774-1 RJ45 (USA)
  • Siemens SCALANCE W778-1 M12
  • Siemens SCALANCE W778-1 M12 EEC
  • Siemens SCALANCE W778-1 M12 EEC (USA)
  • Siemens SCALANCE W786-1 RJ45
  • Siemens SCALANCE W786-2 RJ45
  • Siemens SCALANCE W786-2 SFP
  • Siemens SCALANCE W786-2IA RJ45
  • Siemens SCALANCE W788-1 M12
  • Siemens SCALANCE W788-1 RJ45
  • Siemens SCALANCE W788-2 M12
  • Siemens SCALANCE W788-2 M12 EEC
  • Siemens SCALANCE W788-2 RJ45

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.