HOME VULNERABILITIESCVE-2021-23133

HIGH

CVE-2021-23133

CWE-362Published: April 22, 2021· Updated: Jun 17, 2026

7.0

CVSS v3.1

Official Description

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

Technical Analysis

CVE-2021-23133 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

broadcom1 product(s)

brocade fabric operating system

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

Linux1 product(s)

linux kernel

netapp20 product(s)

cloud backupsolidfire \& hci management nodeh410c firmwareh410ch300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300e+8

Source: NVD CPE · 26 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

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/2021/05/10/1

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/2

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/3

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/4

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b

PATCHhttps://www.openwall.com/lists/oss-security/2021/04/18/2

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/1

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/2

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/3

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/10/4

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b

PATCHhttps://www.openwall.com/lists/oss-security/2021/04/18/2

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20210611-0008/

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20210611-0008/

All References (24)

→

http://www.openwall.com/lists/oss-security/2021/05/10/1Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/10/2Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/10/3Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/10/4Mailing List · Patch · Third Party Advisory

→

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5bMailing List · Patch · Vendor Advisory

→

https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMitigation · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlMitigation · Third Party Advisory

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/

→

https://security.netapp.com/advisory/ntap-20210611-0008/Third Party Advisory

→

https://www.openwall.com/lists/oss-security/2021/04/18/2Exploit · Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/10/1Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/10/2Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/10/3Mailing List · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-23133

CVSS Score7.0 / 10

SeverityHIGH

WeaknessCWE-362

CISA KEVNo

Affected5 vendor(s)

PublishedApr 22, 2021

Related CVEs (CWE-362)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-23133 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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