CVE-2026-80585
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
mptcp: fastopen: only mark MPTFO subflows with SYN data
In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty. mptcp_fastopen_subflow_synack_set_params() set is_mptfo before checking for queued SYN data. That made data-less TFO SYNs hit a WARN and, if the warning was non-fatal, left stale MPTFO state behind. The stale flag could later trigger a state-confusion bug in check_fully_established(). Only mark the subflow as MPTFO after confirming that an SKB was queued. Return quietly when the receive queue is empty. Note that mptcp_subflow_context's is_mptfo field is now not just about subflows where the TFO was present, but about MPTFO subflow that consumed SYN data. Only having a valid cookie but not carrying data is not really "doing TFO".
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 36b122baf6a8bd46b4a591f12f4ed17b22257408 | affected | git | f75f174edc865738522e514d042cf5627f084859 | Unavailable | None listed |
| 36b122baf6a8bd46b4a591f12f4ed17b22257408 | affected | git | fca7e444c04689fe4cc6b56f2725f804a4bb1ef9 | Unavailable | None listed |
| 36b122baf6a8bd46b4a591f12f4ed17b22257408 | affected | git | 75e564b2ced1cc3d9a8904c7d2d2bb448fffb8b5 | Unavailable | None listed |
| 36b122baf6a8bd46b4a591f12f4ed17b22257408 | affected | git | 72b4a0c51a4b550d40301d60a366b429b8c8e78d | Unavailable | None listed |
| 36b122baf6a8bd46b4a591f12f4ed17b22257408 | affected | git | e00b63056fb4f261455b3e5df5268a1f8ce47a87 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.2 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.2 | Unavailable | None listed |
| 6.6.153 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.105 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.46 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.10 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |