CVE-2023-53110

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups.

This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create().

smc_smcr_terminate_all

smc_buf_create /* init */ conn->sndbuf_desc = NULL; ...

__smc_lgr_terminate smc_conn_kill smc_close_abort smc_cdc_get_slot_and_msg_send

__softirqentry_text_start smc_wr_tx_process_cqe smc_cdc_tx_handler READ(conn->sndbuf_desc->len); /* panic dues to NULL sndbuf_desc */

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This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.

Detalles técnicos trazas, registros y código del informe original

conn->sndbuf_desc = xxx;

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.48%
Percentil entre todas las CVEs puntuadas: 39
Fecha de la puntuación: 6/10/2026

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)

Linux — Linux Kernel

CWE

CWE-476

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()\n\nWhen performing a stress test on SMC-R by rmmod mlx5_ib driver\nduring the wrk/nginx test, we found that there is a probability\nof triggering a panic while terminating all link groups.\n\nThis issue dues to the race between smc_smcr_terminate_all()\nand smc_buf_create().\n\n\t\t\tsmc_smcr_terminate_all\n\nsmc_buf_create\n/* init */\nconn->sndbuf_desc = NULL;\n...\n\n\t\t\t__smc_lgr_terminate\n\t\t\t\tsmc_conn_kill\n\t\t\t\t\tsmc_close_abort\n\t\t\t\t\t\tsmc_cdc_get_slot_and_msg_send\n\n\t\t\t__softirqentry_text_start\n\t\t\t\tsmc_wr_tx_process_cqe\n\t\t\t\t\tsmc_cdc_tx_handler\n\t\t\t\t\t\tREAD(conn->sndbuf_desc->len);\n\t\t\t\t\t\t/* panic dues to NULL sndbuf_desc */\n\nconn->sndbuf_desc = xxx;\n\nThis patch tries to fix the issue by always to check the sndbuf_desc\nbefore send any cdc msg, to make sure that no null pointer is\nseen during cqe processing."
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    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: corrección de sndbuf_desc NULL en smc_cdc_tx_handler(). Al realizar una prueba de estrés en SMC-R con el controlador rmmod mlx5_ib durante la prueba wrk/nginx, se observó la probabilidad de generar un pánico al terminar todos los grupos de enlaces. Este problema se debe a la competencia entre smc_smcr_terminate_all() y smc_buf_create(). smc_smcr_terminate_all smc_buf_create /* init */ conn-&gt;sndbuf_desc = NULL; ... __smc_lgr_terminate smc_conn_kill smc_close_abort smc_cdc_get_slot_and_msg_send __softirqentry_text_start smc_wr_tx_process_cqe smc_cdc_tx_handler READ(conn-&gt;sndbuf_desc-&gt;len); /* pánico debido a NULL sndbuf_desc */ conn-&gt;sndbuf_desc = xxx; Este parche intenta solucionar el problema verificando siempre sndbuf_desc antes de enviar cualquier mensaje de cdc, para asegurarse de que no se vea ningún puntero nulo durante el procesamiento de cqe."
    }
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  "lastModified": "2026-08-04T10:18:55.607",
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