mptcp: options: fix uninit-value in mptcp_write_data_fin
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EPSS probability
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Risk score
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Published
13 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
An uninit-value vulnerability in mptcp_write_data_fin within the Linux kernel MPTCP subsystem has been resolved [S0]. When sending a DATA_FIN without data and if the checksum has been negotiated, the initial csum data needs to be reset [S0].
This vulnerability affects the MPTCP component of the Linux kernel and can lead to uninit-value issues during packet transmission [S0]. The patch status remains unverified in official sources [S0].
What should be done?
- Follow vendor advisories and security updates [S0]
- Review the corresponding stable kernel patch references [S1]
Chain of evidence and sources
Linux çekirdeğindeki mptcp_write_data_fin içerisinde bir uninit-value zafiyeti çözülmüştür [S0].
Sorun, ext_copy yapısının varsayılan olarak sıfırlanmamasından kaynaklanmaktadır [S0].
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: mptcp: options: fix uninit-value in mptcp_write_data_fin When sending a DATA_FIN without data, and because the DATA_FIN occupies 1 octet of the connection-level sequence space [1], it is then required to add a DSS mapping with specific values. If the checksum has been negotiated, it also needs to be computed, and included in the outgoing packet, and thus the initial csum data needs to be reset to 0 as well. This is no longer the case since commit cfcceb7a39fc ("tcp: shrink per-packet memset in __tcp_transmit_skb()"), because the whole ext_copy structure is no longer zeroed by default. This seems to be the only case where use_map is changed and set afterwards, so initialising the csum field only in this case, along with other fields for this specific case.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98438 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98438 weaknesses.
Official Sources and Advisories
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