Vulnerability Details : CVE-2021-38209
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.
Exploit prediction scoring system (EPSS) score for CVE-2021-38209
Probability of exploitation activity in the next 30 days: 0.04%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 10 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-38209
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:P/I:N/A:N |
3.9
|
2.9
|
NIST |
|
3.3
|
LOW | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
1.8
|
1.4
|
NIST |
CWE ids for CVE-2021-38209
-
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-38209
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.2
Mailing List;Patch;Vendor Advisory
-
https://github.com/torvalds/linux/commit/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6
netfilter: conntrack: Make global sysctls readonly in non-init netns · torvalds/linux@2671fa4 · GitHubPatch;Third Party Advisory
Products affected by CVE-2021-38209
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*