CVE-2026-46015 (GCVE-0-2026-46015)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-10-19 19:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
Version: 54b92e84193749c9968aff2dd46e3b0f42643e18
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A remote peer cannot set up the migration group or drive the race, so the vector is Local.\\nAC:L - The attacker controls both sides of the race (the closing listener via inet_csk_listen_stop and the concurrent accept/close that drops the listener\u0027s last ref), and the missed-wakeup half is deterministic; per guidance an attacker-created race is Low.\\nPR:L - Migration must be enabled, requiring CAP_NET_ADMIN to set the per-netns net.ipv4.tcp_migrate_req sysctl (or a SK_REUSEPORT/migrate BPF prog), all of which an unprivileged user obtains in a user namespace via unshare -Urn.\\nUI:N - Triggering depends only on the attacker\u0027s own socket operations; no action by any other user is required.\\nS:U - The use-after-free and its impact are confined to the kernel\u0027s own memory/security authority with no crossing of a VM, IOMMU, or sandbox boundary.\\nC:H - Use-after-free of a SOCK_RCU_FREE listener socket lets reallocated/freed memory be read (e.g., via sock_net(nsk)), enabling kernel information disclosure.\\nI:H - The freed socket is dereferenced for sock_net(nsk) in __NET_INC_STATS (a pointer-controlled increment) and sk_data_ready(nsk) (a function-pointer call), giving an attacker-influenced write/control-flow primitive after heap grooming.\\nA:H - The use-after-free reliably crashes the kernel, and the always-present missed wakeup hangs a listener\u0027s accept/poll/epoll waiters indefinitely.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"7aa7933a5607b1e5b56f322d17265c1d0ea02c51\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"14e9bb6eba8f59dcc637702e4744ae5e30660d76\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"bebd058ef40c67a81fe6d9ee8beaa4ede90e0704\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"83bb57635d7cbafde32f865b577ecfd969f02337\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"12625b4da84caf4d84a04988710a7b9bcf702b18\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"54b92e84193749c9968aff2dd46e3b0f42643e18\", \"lessThan\": \"3864c6ba1e041bc75342353a70fa2a2c6f909923\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/inet_connection_sock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.140\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.86\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.27\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/inet_connection_sock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7aa7933a5607b1e5b56f322d17265c1d0ea02c51\"}, {\"url\": \"https://git.kernel.org/stable/c/14e9bb6eba8f59dcc637702e4744ae5e30660d76\"}, {\"url\": \"https://git.kernel.org/stable/c/ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b\"}, {\"url\": \"https://git.kernel.org/stable/c/bebd058ef40c67a81fe6d9ee8beaa4ede90e0704\"}, {\"url\": \"https://git.kernel.org/stable/c/83bb57635d7cbafde32f865b577ecfd969f02337\"}, {\"url\": \"https://git.kernel.org/stable/c/12625b4da84caf4d84a04988710a7b9bcf702b18\"}, {\"url\": \"https://git.kernel.org/stable/c/3864c6ba1e041bc75342353a70fa2a2c6f909923\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: call sk_data_ready() after listener migration\\n\\nWhen inet_csk_listen_stop() migrates an established child socket from\\na closing listener to another socket in the same SO_REUSEPORT group,\\nthe target listener gets a new accept-queue entry via\\ninet_csk_reqsk_queue_add(), but that path never notifies the target\\nlistener\u0027s waiters. A nonblocking accept() still works because it\\nchecks the queue directly, but poll()/epoll_wait() waiters and\\nblocking accept() callers can also remain asleep indefinitely.\\n\\nCall READ_ONCE(nsk-\u003esk_data_ready)(nsk) after a successful migration\\nin inet_csk_listen_stop().\\n\\nHowever, after inet_csk_reqsk_queue_add() succeeds, the ref acquired\\nin reuseport_migrate_sock() is effectively transferred to\\nnreq-\u003ersk_listener. Another CPU can then dequeue nreq via accept()\\nor listener shutdown, hit reqsk_put(), and drop that listener ref.\\nSince listeners are SOCK_RCU_FREE, wrap the post-queue_add()\\ndereferences of nsk in rcu_read_lock()/rcu_read_unlock(), which also\\ncovers the existing sock_net(nsk) access in that path.\\n\\nThe reqsk_timer_handler() path does not need the same changes for two\\nreasons: half-open requests become readable only after the final ACK,\\nwhere tcp_child_process() already wakes the listener; and once nreq is\\nvisible via inet_ehash_insert(), the success path no longer touches\\nnsk directly.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.140\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.86\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.27\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.4\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"5.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:29:10.115Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46015\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:26:41.435Z\", \"dateReserved\": \"2026-05-13T15:03:33.092Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-27T12:56:17.249Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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