CVE-2020-11494Public exploit

Kernel stack disclosure via uninitialized CAN padding

Published Apr 2, 2020 · Updated Aug 4, 2024

Information disclosure in the Linux kernel 3.16 through 5.6.2 allows local users to read kernel stack memory through Serial CAN frames. In slc_bump, drivers/net/can/slcan.c initializes selected can_frame fields but leaves structure padding uninitialized before transmission. Exposure requires elevated local access to Serial CAN and a kernel built without CONFIG_INIT_STACK_ALL; disclosed bytes affect confidentiality only.

CVSS severity4.4
Medium
EPSS probability0.72%
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 the Linux kernel 3.16 through 5.6.2 allows local users to read kernel stack memory through Serial CAN frames. In slc_bump, drivers/net/can/slcan.c initializes selected can_frame fields but leaves structure padding uninitialized before transmission. Exposure requires elevated local access to Serial CAN and a kernel built without CONFIG_INIT_STACK_ALL; disclosed bytes affect confidentiality only.

The record

CVE
CVE-2020-11494
Published
Apr 2, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 2, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.4National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
2.1National Vulnerability DatabaseAV:L/AC:L/Au:N/C:P/I:N/A:N
5.3SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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