CVE-2026-80587 evidence review

Linux

In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid combining some incoming suboptions Some MPTCP suboptions are mutually exclusive according to the RFC8684, but also because in different places, the code doesn't expect some combinations to be present. That's specially true for suboptions that would be present twice, but with different attributes. The new restrictions are the same as the ones applied on the output side, with mptcp_write_options. The same rules can be reused with a small fix: an MP_FASTCLOSE can be used with a DSS when the sender picks this optio...

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Evidence review

This record remains available for product and version identification, but it is not presented as a complete remediation procedure. Confirm the affected range and the supported fix in a direct vendor advisory before changing production systems.

ProductLinux

Affected versions>= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < 0e2210af439755a2af352eea4178261dcf61742e, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < dc1d8d3eb345c616fbe922a010fa391c72c54d52, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < 099bfcbd0c16ae9b50aba2a1bea033e63f895da7, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < a04dcc784959e4702048785d87e0d029bd2fbdcb, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < 6bab907292155513af397a12ccb488acbfc30d79, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < b6ee361524641f57b2e2363f7737f20e17f67827, >= 5.6

Fixed versionsNo verified fixed-version field is available yet

Priority basisReview · CVSS 9.8 · EPSS -

Identify the product and installed version

Record whether Linux is present, where it is installed, and which interfaces are exposed.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Compare the affected range

Use the current record as an identification aid: >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < 0e2210af439755a2af352eea4178261dcf61742e, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < dc1d8d3eb345c616fbe922a010fa391c72c54d52, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < 099bfcbd0c16ae9b50aba2a1bea033e63f895da7, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < a04dcc784959e4702048785d87e0d029bd2fbdcb, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < 6bab907292155513af397a12ccb488acbfc30d79, >= eda7acddf8080bb2d022a8d4b8b2345eb80c63ec < b6ee361524641f57b2e2363f7737f20e17f67827, >= 5.6. Resolve incomplete inventory results before deciding that an asset is unaffected.

Verify the authoritative remediation source

Open the linked source material and locate a direct vendor advisory for this CVE. Confirm the supported fixed release and product-specific update path before making a production change.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.