SB2021072315 - SUSE update for the Linux Kernel (Live Patch 17 for SLE 12 SP5)

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Main Vulnerability Database SB2021072315

SB2021072315 - SUSE update for the Linux Kernel (Live Patch 17 for SLE 12 SP5)

Published: July 23, 2021

Security Bulletin ID SB2021072315
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Race condition (CVE-ID: CVE-2021-23133)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in Linux kernel SCTP sockets (net/sctp/socket.c). 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 a local user 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.


Remediation

Install update from vendor's website.

References