CVE-2021-4203

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.

• CWE-362
• CWE-362
• CWE-416

• https://bugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-after%3Atoday-30&sort=-modified&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified%20Cve&cells=tiles&redir=1Exploit, Issue Tracking, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2036934Issue Tracking, Patch, Third Party Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306eb23814Patch, Vendor Advisory
• https://lore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com/T/
• https://security.netapp.com/advisory/ntap-20221111-0003/Third Party Advisory
• https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
• https://bugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-after%3Atoday-30&sort=-modified&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified%20Cve&cells=tiles&redir=1Exploit, Issue Tracking, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2036934Issue Tracking, Patch, Third Party Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306eb23814Patch, Vendor Advisory
• https://lore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com/T/
• https://security.netapp.com/advisory/ntap-20221111-0003/Third Party Advisory
• https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory

Published

Mar 25, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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