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CVE-2021-23133— Linux Kernel sctp_destroy_sock race condition

Quick assessment

Affected
Linux Kernel Linux Kernel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在竞争条件问题漏洞，该漏洞源于sctp_destroy_sock函数导致内存损坏，从而触发拒绝服务，并可能运行代码。

CVSS 6.7 · Medium EPSS 0.47% · P39
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I. Basic Information for CVE-2021-23133

Vulnerability Information
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Vulnerability Title
Linux Kernel sctp_destroy_sock race condition
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在竞争条件问题漏洞，该漏洞源于sctp_destroy_sock函数导致内存损坏，从而触发拒绝服务，并可能运行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Kernel Linux Kernel unspecified ~ 5.12-rc8 -

II. Public POCs for CVE-2021-23133

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III. Intelligence Information for CVE-2021-23133

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Patches & Fixes for CVE-2021-23133 (1)

Vendor Advisories for CVE-2021-23133 (1)

Mailing List Discussions for CVE-2021-23133 (9)

IV. Related Vulnerabilities

Same product: Linux Kernel
Same vendor: Linux Kernel
Same weakness: CWE-362

V. Comments for CVE-2021-23133

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