HOMEVULNERABILITIESCVE-2020-25669
HIGH

CVE-2020-25669

CWE-416Published: May 26, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free.

NVD Source

Technical Analysis

CVE-2020-25669 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Linux1 product(s)
linux kernel
netapp19 product(s)
cloud backupsolidfire \& hci management nodesolidfire baseboard management controllerh300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmware+7
Source: NVD CPE · 21 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e
PATCHhttps://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e
ADVISORYhttp://www.openwall.com/lists/oss-security/2020/11/05/2
ADVISORYhttp://www.openwall.com/lists/oss-security/2020/11/20/5
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210702-0006/
ADVISORYhttp://www.openwall.com/lists/oss-security/2020/11/05/2
ADVISORYhttp://www.openwall.com/lists/oss-security/2020/11/20/5
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210702-0006/

All References (16)

→
http://www.openwall.com/lists/oss-security/2020/11/05/2Exploit · Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2020/11/20/5Exploit · Mailing List · Third Party Advisory
→
https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7ePatch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210702-0006/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2020/11/05/2%2C
→
https://www.openwall.com/lists/oss-security/2020/11/20/5%2C
→
http://www.openwall.com/lists/oss-security/2020/11/05/2Exploit · Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2020/11/20/5Exploit · Mailing List · Third Party Advisory
→
https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7ePatch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210702-0006/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2020/11/05/2%2C

Quick Facts

CVE IDCVE-2020-25669
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-416
CISA KEVNo
Affected3 vendor(s)
PublishedMay 26, 2021

Related CVEs (CWE-416)

CVE-2015-3107
10.0
CVE-2012-1973
10.0
CVE-2024-43102
10.0
CVE-2010-2300
10.0
CVE-2012-1972
10.0
CVE-2012-1974
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-25669 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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