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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-46015

tcp: call sk_data_ready() after listener migration

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: call sk_data_ready() after listener migration When inet_csk_listen_stop() migrates an established child socket from a closing listener to another socket in the same SO_REUSEPORT group, the target listener gets a new accept-queue entry via inet_csk_reqsk_queue_add(), but that path never notifies the target listener's waiters. A nonblocking accept() still works because it checks the queue directly, but poll()/epoll_wait() waiters and blocking accept() callers can also remain asleep indefinitely. Call READ_ONCE(nsk->sk_data_ready)(nsk) after a successful migration in inet_csk_listen_stop(). However, after inet_csk_reqsk_queue_add() succeeds, the ref acquired in reuseport_migrate_sock() is effectively transferred to nreq->rsk_listener. Another CPU can then dequeue nreq via accept() or listener shutdown, hit reqsk_put(), and drop that listener ref. Since listeners are SOCK_RCU_FREE, wrap the post-queue_add() dereferences of nsk in rcu_read_lock()/rcu_read_unlock(), which also covers the existing sock_net(nsk) access in that path. The reqsk_timer_handler() path does not need the same changes for two reasons: half-open requests become readable only after the final ACK, where tcp_child_process() already wakes the listener; and once nreq is visible via inet_ehash_insert(), the success path no longer touches nsk directly.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < 7aa7933a5607b1e5b56f322d17265c1d0ea02c51affected
  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < 14e9bb6eba8f59dcc637702e4744ae5e30660d76affected
  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < ab5fdcd535645f6dbe6e9e21d96a08d141e88b4baffected
  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < bebd058ef40c67a81fe6d9ee8beaa4ede90e0704affected
  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < 83bb57635d7cbafde32f865b577ecfd969f02337affected
  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < 12625b4da84caf4d84a04988710a7b9bcf702b18affected
  • 54b92e84193749c9968aff2dd46e3b0f42643e18 to < 3864c6ba1e041bc75342353a70fa2a2c6f909923affected

Linux Linux

Default version status: affected

  • 5.14affected
  • 0 to < 5.14unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.140 to ≤ 6.6.*unaffected
  • 6.12.86 to ≤ 6.12.*unaffected
  • 6.18.27 to ≤ 6.18.*unaffected
  • 7.0.4 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References