CVE-2021-4203

moderate-risk
Published 2022-03-25

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.

Do I need to act?

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0.09% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.8/10 Medium
NETWORK / HIGH complexity

Affected Products (20)

Affected Vendors

Linux Oracle Netapp

References (12)

Exploit https://bugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-...
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2036934
Patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306e...
https://lore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com...
Third Party Advisory https://security.netapp.com/advisory/ntap-20221111-0003/
Patch https://www.oracle.com/security-alerts/cpujul2022.html
Exploit https://bugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-...
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2036934
Patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306e...
https://lore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com...
Third Party Advisory https://security.netapp.com/advisory/ntap-20221111-0003/
Patch https://www.oracle.com/security-alerts/cpujul2022.html
41
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 20/34 · Moderate