CVE-2026-89554
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: fix uninitialized local_id in syncookie MP_JOIN reconstruction
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.
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) |
|---|---|---|---|---|---|
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | 4534e0eead692bb069ad1e6a5a245fc2e2078300 | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | 63cacb05e51a1c6e1349d2e593d00fd6ef43def4 | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | 954b5ea836eb118d188975ced803448537ab8479 | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | 9df36a4846375a9b75bf42d77bfed216b0f366f9 | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | 64f2c5dd49b956a542c8c02b8dad5d262a462bba | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | 51887ccd88791ddaa8755a7c614fda031ecf7982 | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | bf19d166337c6488b39cb03eeeffb30a941d6326 | Unavailable | None listed |
| 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 | affected | git | b878dfdd12d7a5b8722a78d35e313506140ca3d9 | 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) |
|---|---|---|---|---|---|
| 5.9 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.9 | Unavailable | None listed |
| 5.10.270 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.221 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.188 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.109 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.50 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.4 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |