CVE-2021-4203: Linux Kernel

Medium severity, CVSS 6.8. EPSS: 1.7% chance of exploitation in the next 30 days.

A use-after-free read flaw was found in sock_getsockopt() in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() (and connect()) in the Linux kernel. In this flaw, an attacker with a user privileges may crash the system or leak internal kernel information.

Affected products

• Linux Linux Kernel: before 5.15 (fixed in 5.15); version 5.15 only
• Netapp a700s Firmware: affected versions not specified
• Netapp Active Iq Unified Manager: affected versions not specified
• Netapp Bootstrap OS: affected versions not specified
• Netapp E-Series Santricity OS Controller: from 11.0.0, up to and including 11.70.2
• Netapp Element Software: affected versions not specified
• Netapp h300s Firmware: affected versions not specified
• Netapp h410c Firmware: affected versions not specified
• Netapp h410s Firmware: affected versions not specified
• Netapp h500s Firmware: affected versions not specified
• Netapp h700s Firmware: affected versions not specified
• Netapp Hci Management Node: affected versions not specified
• Netapp Solidfire: affected versions not specified
• Oracle Communications Cloud Native Core Binding Support Function: version 22.1.3 only
• Oracle Communications Cloud Native Core Network Exposure Function: version 22.1.1 only
• Oracle Communications Cloud Native Core Policy: version 22.2.0 only

Published 2022-03-25. Last modified 2026-06-17.