CVE-2026-46015tcp: call sk_data_ready() after listener migration
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 54b92e84193749c9968aff2dd46e3b0f42643e18 builds before 7aa7933a5607b1e5b56f322d17265c1d0ea02c51; 54b92e84193749c9968aff2dd46e3b0f42643e18 builds before 14e9bb6eba8f59dcc637702e4744ae5e30660d76; from 54b92e84193749c9968aff2dd46e3b0f42643e18 before ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b; from 54b92e84193749c9968aff2dd46e3b0f42643e18 before bebd058ef40c67a81fe6d9ee8beaa4ede90e0704; from 54b92e84193749c9968aff2dd46e3b0f42643e18 before 83bb57635d7cbafde32f865b577ecfd969f02337; from 54b92e84193749c9968aff2dd46e3b0f42643e18 before 12625b4da84caf4d84a04988710a7b9bcf702b18; from 54b92e84193749c9968aff2dd46e3b0f42643e18 before 3864c6ba1e041bc75342353a70fa2a2c6f909923 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.14 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27; from 6.19 before 7.0.4 | NVD |
References
- https://git.kernel.org/stable/c/7aa7933a5607b1e5b56f322d17265c1d0ea02c51patch
- https://git.kernel.org/stable/c/14e9bb6eba8f59dcc637702e4744ae5e30660d76patch
- https://git.kernel.org/stable/c/ab5fdcd535645f6dbe6e9e21d96a08d141e88b4bpatch
- https://git.kernel.org/stable/c/bebd058ef40c67a81fe6d9ee8beaa4ede90e0704patch
- https://git.kernel.org/stable/c/83bb57635d7cbafde32f865b577ecfd969f02337patch
- https://git.kernel.org/stable/c/12625b4da84caf4d84a04988710a7b9bcf702b18patch
- https://git.kernel.org/stable/c/3864c6ba1e041bc75342353a70fa2a2c6f909923patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.