CVE-2026-46015
tcp: call sk_data_ready() after listener migration
- Published
- Updated
- Reserved
- Assigned by
- 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < 7aa7933a5607b1e5b56f322d17265c1d0ea02c51
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < 14e9bb6eba8f59dcc637702e4744ae5e30660d76
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < bebd058ef40c67a81fe6d9ee8beaa4ede90e0704
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < 83bb57635d7cbafde32f865b577ecfd969f02337
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < 12625b4da84caf4d84a04988710a7b9bcf702b18
- affected 54b92e84193749c9968aff2dd46e3b0f42643e18 – < 3864c6ba1e041bc75342353a70fa2a2c6f909923
- affected 5.14
- unaffected < 5.14
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.86 – ≤ 6.12.*
- unaffected 6.18.27 – ≤ 6.18.*
- unaffected 7.0.4 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References (10)
- https://git.kernel.org/stable/c/7aa7933a5607b1e5b56f322d17265c1d0ea02c51 (opens in a new tab)
- https://git.kernel.org/stable/c/14e9bb6eba8f59dcc637702e4744ae5e30660d76 (opens in a new tab)
- https://git.kernel.org/stable/c/ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b (opens in a new tab)
- https://git.kernel.org/stable/c/bebd058ef40c67a81fe6d9ee8beaa4ede90e0704 (opens in a new tab)
- https://git.kernel.org/stable/c/83bb57635d7cbafde32f865b577ecfd969f02337 (opens in a new tab)
- https://git.kernel.org/stable/c/12625b4da84caf4d84a04988710a7b9bcf702b18 (opens in a new tab)
- https://git.kernel.org/stable/c/3864c6ba1e041bc75342353a70fa2a2c6f909923 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-46015)Record last updated .