Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0 The in-kernel MPTCP path manager can leave a stale ADD_ADDR announcement entry alive when removing the id 0 endpoint. This happens because the id 0 removal path does not tear down pending announcements, unlike the non-zero id path. When the PM later reselects id 0 after adding another signal endpoint, it finds the stale anno_list entry and hits WARN_ON_ONCE(mptcp_pm_is_kernel()) in mptcp_pm_announced_alloc(). Root cause: asymmetry between removal paths. - Non-zero id path: mptcp_nl_remove_subflow_and_signal_addr() calls mptcp_pm_remove_announced() to clean up. - Id 0 path: mptcp_nl_remove_id_zero_address() skips cleanup entirely. Fix by making the id 0 path symmetric: call mptcp_pm_announced_remove() and decrement add_addr_signaled before queuing the RM_ADDR. Subtle detail: signal endpoints are stored in anno_list with port 0, but msk_local carries the connection's local port. In other words, entries linked to ID0 paths should have port == 0. A follow-up patch will ensure that. mptcp_pm_announced_remove() uses use_port=true for comparison. So clear the port before the lookup.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 740d798e8767d8a449902b1a1bbc70facfce19b5 before 189d60057e5f3d6a62e3d71a3cc428c9150bc14f; affected 740d798e8767d8a449902b1a1bbc70facfce19b5 before bacf23e7c9876c9f4170166b3597cb22ea3ed39b; affected 740d798e8767d8a449902b1a1bbc70facfce19b5 before d4a67a880654e1bfe318a31bea0bdbb026a09ade; affected 740d798e8767d8a449902b1a1bbc70facfce19b5 before 545616b4e7325be3c61fc082538cb06d14f7b1db; affected 740d798e8767d8a449902b1a1bbc70facfce19b5 before 2ac7d6e620764f1fc79eb4edd3610a7a661981ca |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 6.6.160 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/189d60057e5f3d6a62e3d71a3cc428c9150bc14f
- https://git.kernel.org/stable/c/bacf23e7c9876c9f4170166b3597cb22ea3ed39b
- https://git.kernel.org/stable/c/d4a67a880654e1bfe318a31bea0bdbb026a09ade
- https://git.kernel.org/stable/c/545616b4e7325be3c61fc082538cb06d14f7b1db
- https://git.kernel.org/stable/c/2ac7d6e620764f1fc79eb4edd3610a7a661981ca