HOMEVULNERABILITIESCVE-2021-26708
HIGH

CVE-2021-26708

CWE-667Published: February 5, 2021· Updated: Jun 17, 2026

7.0
CVSS v3.1

Official Description

A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.

NVD Source

Technical Analysis

CVE-2021-26708 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 7.0.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

Linux1 product(s)
linux kernel
netapp11 product(s)
aff baseboard management controllercloud backupfas baseboard management controllersolidfire \& hci management nodesolidfire baseboard management controllerbaseboard management controller 500f firmware500fbaseboard management controller a250 firmwarea250hci h410c firmwarehci h410c
Source: NVD CPE · 12 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

PATCHhttp://www.openwall.com/lists/oss-security/2021/02/05/6
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
PATCHhttps://security.netapp.com/advisory/ntap-20210312-0008/
PATCHhttps://www.openwall.com/lists/oss-security/2021/02/04/5
PATCHhttp://www.openwall.com/lists/oss-security/2021/02/05/6
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
PATCHhttps://security.netapp.com/advisory/ntap-20210312-0008/
PATCHhttps://www.openwall.com/lists/oss-security/2021/02/04/5
ADVISORYhttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13
ADVISORYhttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13

All References (14)

→
http://www.openwall.com/lists/oss-security/2021/02/05/6Mailing List · Patch · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/04/09/2Mailing List
→
http://www.openwall.com/lists/oss-security/2022/01/25/14Mailing List
→
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13Release Notes · Vendor Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446Patch · Vendor Advisory
→
https://security.netapp.com/advisory/ntap-20210312-0008/Patch · Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/02/04/5Mailing List · Patch · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/02/05/6Mailing List · Patch · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/04/09/2Mailing List
→
http://www.openwall.com/lists/oss-security/2022/01/25/14Mailing List
→
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13Release Notes · Vendor Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446Patch · Vendor Advisory
→
https://security.netapp.com/advisory/ntap-20210312-0008/Patch · Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/02/04/5Mailing List · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-26708
CVSS Score7.0 / 10
SeverityHIGH
WeaknessCWE-667
CISA KEVNo
Affected2 vendor(s)
PublishedFeb 5, 2021

Related CVEs (CWE-667)

CVE-2021-22530
9.9
CVE-2020-12658
9.8
CVE-2019-5886
9.8
CVE-2020-15674
8.8
CVE-2024-58087
8.1
CVE-2023-20939
7.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-26708 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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