CVE-2025-22021
Vulnerability Scoring
Analysis In Progress
CVE-2025-22021 Vulnerability Analysis & Exploit Details
CVE-2025-22021
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2025-22021 Details
Status: Awaiting Analysis
Published on: 16 Apr 2025, 11:15 UTC
CVSS Release:
CVE-2025-22021 Vulnerability Summary
CVE-2025-22021: In the Linux kernel, the following vulnerability has been resolved: netfilter: socket: Lookup orig tuple for IPv6 SNAT nf_sk_lookup_slow_v4 does the conntrack lookup for IPv4 packets to restore the original 5-tuple in case of SNAT, to be able to find the right socket (if any). Then socket_match() can correctly check whether the socket was transparent. However, the IPv6 counterpart (nf_sk_lookup_slow_v6) lacks this conntrack lookup, making xt_socket fail to match on the socket when the packet was SNATed. Add the same logic to nf_sk_lookup_slow_v6. IPv6 SNAT is used in Kubernetes clusters for pod-to-world packets, as pods' addresses are in the fd00::/8 ULA subnet and need to be replaced with the node's external address. Cilium leverages Envoy to enforce L7 policies, and Envoy uses transparent sockets. Cilium inserts an iptables prerouting rule that matches on `-m socket --transparent` and redirects the packets to localhost, but it fails to match SNATed IPv6 packets due to that missing conntrack lookup.
Assessing the Risk of CVE-2025-22021
Access Complexity Graph
The exploitability of CVE-2025-22021 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2025-22021
No exploitability data is available for CVE-2025-22021.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2025-22021, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2025-22021, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2025-22021 does not compromise confidentiality.
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Integrity:
None
CVE-2025-22021 does not impact data integrity.
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Availability:
None
CVE-2025-22021 does not affect system availability.
CVE-2025-22021 References
External References
- https://git.kernel.org/stable/c/1ca2169cc19dca893c7aae6af122852097435d16
- https://git.kernel.org/stable/c/1ec43100f7123010730b7ddfc3d5c2eac19e70e7
- https://git.kernel.org/stable/c/221c27259324ec1404f028d4f5a0f2ae7f63ee23
- https://git.kernel.org/stable/c/2bb139e483f8cbe488d19d8c1135ac3615e2668c
- https://git.kernel.org/stable/c/41904cbb343d115931d6bf79aa2c815cac4ef72b
- https://git.kernel.org/stable/c/5251041573850e5020cd447374e23010be698898
- https://git.kernel.org/stable/c/58ab63d3ded2ca6141357a2b24eee8453d0f871d
- https://git.kernel.org/stable/c/6488b96a79a26e19100ad872622f04e93b638d7f
- https://git.kernel.org/stable/c/932b32ffd7604fb00b5c57e239a3cc4d901ccf6e
CWE Common Weakness Enumeration
Unknown
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