CVE-2022-50838
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
net: stream: purge sk_error_queue in sk_stream_kill_queues()
Changheon Lee reported TCP socket leaks, with a nice repro.
It seems we leak TCP sockets with the following sequence:
1) SOF_TIMESTAMPING_TX_ACK is enabled on the socket.
3) Application closes the socket, while error queue is not empty.
Since tcp_close() no longer purges the socket error queue, we might end up with a TCP socket with at least one skb in error queue keeping the socket alive forever.
This bug can be (ab)used to consume all kernel memory and freeze the host.
We need to purge the error queue, with proper synchronization against concurrent writers.
Detalles técnicos trazas, registros y código del informe original
Each ACK will cook an skb put in error queue, from __skb_tstamp_tx(). __skb_tstamp_tx() is using skb_clone(), unless SOF_TIMESTAMPING_OPT_TSONLY was also requested. 2) If the application is also using MSG_ZEROCOPY, then we put in the error queue cloned skbs that had a struct ubuf_info attached to them. Whenever an struct ubuf_info is allocated, sock_zerocopy_alloc() does a sock_hold(). As long as the cloned skbs are still in sk_error_queue, socket refcount is kept elevated.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.28%
- Percentil entre todas las CVEs puntuadas: 19
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/4f1d37ff4226eb99d6b69e9f4518e279e1a851bf
- https://git.kernel.org/stable/c/6f00bd0402a1e3d2d556afba57c045bd7931e4d3
- https://git.kernel.org/stable/c/8c330c36b3970d0917f48827fa6c7a9c75aa4602
- https://git.kernel.org/stable/c/9062493811676ee0efe6c74d98f00ca38c4e17d4
- https://git.kernel.org/stable/c/9da204cd67c4fe97e8aa465d10d5c2e7076f7f42
- https://git.kernel.org/stable/c/b458d349f8753f666233828ebd30df6f100cf7d5
- https://git.kernel.org/stable/c/bab542cf56fc174c8447c00b73be99ffd66d2d39
- https://git.kernel.org/stable/c/c8c1eec578a9ae2dc8f14a1846942a0b7bf29d1d
- https://git.kernel.org/stable/c/e0c8bccd40fc1c19e1d246c39bcf79e357e1ada3
JSON original (NVD)
Mostrar
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stream: purge sk_error_queue in sk_stream_kill_queues()\n\nChangheon Lee reported TCP socket leaks, with a nice repro.\n\nIt seems we leak TCP sockets with the following sequence:\n\n1) SOF_TIMESTAMPING_TX_ACK is enabled on the socket.\n\n Each ACK will cook an skb put in error queue, from __skb_tstamp_tx().\n __skb_tstamp_tx() is using skb_clone(), unless\n SOF_TIMESTAMPING_OPT_TSONLY was also requested.\n\n2) If the application is also using MSG_ZEROCOPY, then we put in the\n error queue cloned skbs that had a struct ubuf_info attached to them.\n\n Whenever an struct ubuf_info is allocated, sock_zerocopy_alloc()\n does a sock_hold().\n\n As long as the cloned skbs are still in sk_error_queue,\n socket refcount is kept elevated.\n\n3) Application closes the socket, while error queue is not empty.\n\nSince tcp_close() no longer purges the socket error queue,\nwe might end up with a TCP socket with at least one skb in\nerror queue keeping the socket alive forever.\n\nThis bug can be (ab)used to consume all kernel memory\nand freeze the host.\n\nWe need to purge the error queue, with proper synchronization\nagainst concurrent writers."
}
],
"lastModified": "2026-06-17T05:24:16.417",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}