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Fencer Vulns
medium 5.5

CVE-2020-13844 json

Arm Armv8-A core implementations utilizing speculative execution past unconditional changes in control flow may allow unauthorized disclosu…

published 2020-06-08 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6057

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

Arm Armv8-A core implementations utilizing speculative execution past unconditional changes in control flow may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka "straight-line speculation."

Patch / fix

  • gcc-9 Ubuntu 20.04 LTS 9.4.0-1ubuntu1~20.04
  • gcc-10 Ubuntu 20.04 LTS 10.2.0-5ubuntu1~20.04
  • gcc-9-cross Ubuntu 20.04 LTS 21ubuntu7

ubuntu advisories UBUNTU-CVE-2020-13844

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

  • gcc7 SLES for SAP 12 SP5, SLES 12 SP5, SLE Module for Toolchain 12 7.5.0+r278197-13.1
  • cross-nvptx-gcc7 SLE Module for Toolchain 12 7.5.0+r278197-13.1
  • gcc7 SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +5 more 7.5.0+r278197-4.19.2
  • cross-nvptx-gcc7 SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +3 more 7.5.0+r278197-4.19.2
  • nvptx-tools SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +3 more 1.0-4.3.2
  • gcc10 SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +5 more 10.2.1+git583-1.3.4
  • cross-nvptx-gcc10 SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +3 more 10.2.1+git583-1.3.2
  • gcc10 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 10.2.1+git583-1.3.5

suse advisories SUSE-SU-2023:3662-1SUSE-SU-2020:3749-1SUSE-SU-2020:2947-1SUSE-SU-2020:3263-1

  • gcc10 openSUSE Tumbleweed 10.3.1+git1893-2.8
  • gcc7 openSUSE Tumbleweed 7.5.0+r278197-10.1
  • gcc7 openSUSE Leap 15.2 7.5.0+r278197-lp152.3.3.1
  • gcc7 openSUSE Leap 15.1 7.5.0+r278197-lp151.2.15.1
  • nvptx-tools openSUSE Leap 15.2 1.0-lp152.4.3.2
  • gcc10 openSUSE Leap 15.2 10.2.1+git583-lp152.2.2
  • cross-nvptx-gcc10 openSUSE Leap 15.2 10.2.1+git583-lp152.2.1
  • nvptx-tools openSUSE Leap 15.1 1.0-lp151.3.3.2

opensuse advisories openSUSE-SU-2024:10702-1openSUSE-SU-2024:10703-1openSUSE-SU-2020:2301-1openSUSE-SU-2020:2300-1openSUSE-SU-2020:1693-1openSUSE-SU-2020:1692-1

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-2020-13844 updated cvss 5.5

kernel: ARM straight-line speculation vulnerability

  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    affected: workaround, no fix planned “Will not fix”
  • 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 kernel, bpftool, kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, +1 more Red Hat Enterprise Linux 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more Red Hat Enterprise MRG 2 kernel
    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

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

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.