mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0

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Summary

CVECVE-2026-97566
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:07 UTC
Updated2026-09-25 11:17:07 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 740d798e8767d8a449902b1a1bbc70facfce19b5 d4a67a880654e1bfe318a31bea0bdbb026a09ade git Not specified
CNA Linux Linux affected 740d798e8767d8a449902b1a1bbc70facfce19b5 545616b4e7325be3c61fc082538cb06d14f7b1db git Not specified
CNA Linux Linux affected 740d798e8767d8a449902b1a1bbc70facfce19b5 2ac7d6e620764f1fc79eb4edd3610a7a661981ca git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2ac7d6e620764f1fc79eb4edd3610a7a661981ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d4a67a880654e1bfe318a31bea0bdbb026a09ade 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/545616b4e7325be3c61fc082538cb06d14f7b1db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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