PT-2021-4231 · Linux+2 · Linux Kernel+2
Published
2021-04-12
·
Updated
2023-05-17
·
CVE-2021-38209
CVSS v3.1
3.3
Low
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 5.12.2
Description
The issue is related to the
NF SYSCTL CT MAX, NF SYSCTL CT EXPECT MAX, and NF SYSCTL CT BUCKETS sysctls in the net/netfilter/nf conntrack standalone.c component of the Linux kernel. It allows observation of changes in any net namespace because these changes are leaked into all other net namespaces. This can potentially allow an attacker to disclose protected information.Recommendations
For Linux kernel versions prior to 5.12.2, update to version 5.12.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the
net/netfilter/nf conntrack standalone.c component to minimize the risk of exploitation. Additionally, restrict the use of the NF SYSCTL CT MAX, NF SYSCTL CT EXPECT MAX, and NF SYSCTL CT BUCKETS sysctls until the issue is resolved.Fix
Side Channel Attack
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Linux Kernel
Suse