CVE-2020-13844

Kernel data disclosure via straight-line speculation

Published Jun 8, 2020 · Updated Aug 4, 2024

Information disclosure in Armv8-A core implementations allows local users to reveal kernel-space data through timing analysis. A core speculatively executes instructions after an unconditional control-flow change, and a suitable revelation gadget leaves secret-dependent cache state. Exploitation requires local EL0 code, attacker-controlled register values, and a suitable gadget; Arm describes practical exploitation as difficult.

CVSS severity5.5
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Armv8-A core implementations allows local users to reveal kernel-space data through timing analysis. A core speculatively executes instructions after an unconditional control-flow change, and a suitable revelation gadget leaves secret-dependent cache state. Exploitation requires local EL0 code, attacker-controlled register values, and a suitable gadget; Arm describes practical exploitation as difficult.

The record

CVE
CVE-2020-13844
Published
Jun 8, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-203, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-203Observable Discrepancy
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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