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CVE-2022-49659

Estado: AnalizadaMedia (5.5)—

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

can: m_can: m_can_{read_fifo,echo_tx_event}(): shift timestamp to full 32 bits

In commit 1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context") the RX path for peripheral devices was switched to RX-offload.

Received CAN frames are pushed to RX-offload together with a timestamp. RX-offload is designed to handle overflows of the timestamp correctly, if 32 bit timestamps are provided.

The timestamps of m_can core are only 16 bits wide. So this patch shifts them to full 32 bit before passing them to RX-offload.

CVSS

Probabilidad de explotación (EPSS)

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

Referencias

JSON original (NVD)

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: m_can: m_can_{read_fifo,echo_tx_event}(): shift timestamp to full 32 bits\n\nIn commit 1be37d3b0414 (\"can: m_can: fix periph RX path: use\nrx-offload to ensure skbs are sent from softirq context\") the RX path\nfor peripheral devices was switched to RX-offload.\n\nReceived CAN frames are pushed to RX-offload together with a\ntimestamp. RX-offload is designed to handle overflows of the timestamp\ncorrectly, if 32 bit timestamps are provided.\n\nThe timestamps of m_can core are only 16 bits wide. So this patch\nshifts them to full 32 bit before passing them to RX-offload."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: m_can: m_can_{read_fifo,echo_tx_event}(): cambiar la marca de tiempo a 32 bits completos En el commit 1be37d3b0414 (\"can: m_can: corregir la ruta RX de los periféricos: usar rx-offload para garantizar que los skbs se envíen desde el contexto de softirq\"), la ruta RX para los dispositivos periféricos se cambió a RX-offload. Los marcos CAN recibidos se envían a RX-offload junto con una marca de tiempo. RX-offload está diseñado para gestionar desbordamientos de la marca de tiempo correctamente, si se proporcionan marcas de tiempo de 32 bits. Las marcas de tiempo del núcleo m_can tienen solo 16 bits de ancho. Por lo tanto, este parche las cambia a 32 bits completos antes de pasarlas a RX-offload."
    }
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  "lastModified": "2026-06-17T05:18:46.670",
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