CVE-2021-38209

LowCVSS 3.3/10Last modified Jun 17, 2026

Description

net/netfilter/nf_conntrack_standalone.c in the Linux kernel before 5.12.2 allows observation of changes in any net namespace because these changes are leaked into all other net namespaces. This is related to the NF_SYSCTL_CT_MAX, NF_SYSCTL_CT_EXPECT_MAX, and NF_SYSCTL_CT_BUCKETS sysctls.

Metrics

CVSS 3.1 3.3/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-203

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.2Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6Patch, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.2Mailing List, Patch, Vendor Advisory
https://github.com/torvalds/linux/commit/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6Patch, Third Party Advisory

Timeline

Published: Aug 8, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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