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CVE-2021-38209

Date: August 8, 2021

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.

Severity Score

Related Resources (7)

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.2
https://nvd.nist.gov/vuln/detail/CVE-2021-38209
https://security-tracker.debian.org/tracker/CVE-2021-38209
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-38209
https://access.redhat.com/security/cve/CVE-2021-38209
https://github.com/torvalds/linux/commit/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6
https://www.mend.io/vulnerability-database/CVE-2021-38209

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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