CVE-2020-11565Public exploit

System crash via empty nodelist parsing

Published Apr 6, 2020 · Updated Aug 4, 2024

Out-of-bounds write in the Linux kernel through 5.6.2 allows local users with mount privileges to crash the system. mpol_parse_str fails to reject an empty MPOL_PREFERRED nodelist before first_node processes the empty nodemask, causing a stack out-of-bounds access. Triggering the flaw requires privileges to supply tmpfs mount options, and the record is disputed because those privileges already permit equivalent system disruption.

CVSS severity6.0
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux kernel through 5.6.2 allows local users with mount privileges to crash the system. mpol_parse_str fails to reject an empty MPOL_PREFERRED nodelist before first_node processes the empty nodemask, causing a stack out-of-bounds access. Triggering the flaw requires privileges to supply tmpfs mount options, and the record is disputed because those privileges already permit equivalent system disruption.

The record

CVE
CVE-2020-11565
Published
Apr 6, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 6, 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

3.6NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:P
6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

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

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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