CVE-2025-39985

Ecosystem	Package	Version

Vulnerabilities

CVE-2025-39985

In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: populate ndo_change_mtu() to prevent buffer overflow Sending an PF_PACKET allows to bypass the CAN framework logic and to directly reach the xmit() function of a CAN driver. The only check which is performed by the PF_PACKET framework is to make sure that skb->len fits the interface's MTU. Unfortunately, because the mcba_usb driver does not populate its net_device_ops->ndo_change_mtu(), it is possible for an attacker to configure an invalid MTU by doing, for example: $ ip link set can0 mtu 9999 After doing so, the attacker could open a PF_PACKET socket using the ETH_P_CANXL protocol: socket(PF_PACKET, SOCK_RAW, htons(ETH_P_CANXL)) to inject a malicious CAN XL frames. For example: struct canxl_frame frame = { .flags = 0xff, .len = 2048, }; The CAN drivers' xmit() function are calling can_dev_dropped_skb() to check that the skb is valid, unfortunately under above conditions, the malicious packet is able to go through can_dev_dropped_skb() checks: 1. the skb->protocol is set to ETH_P_CANXL which is valid (the function does not check the actual device capabilities). 2. the length is a valid CAN XL length. And so, mcba_usb_start_xmit() receives a CAN XL frame which it is not able to correctly handle and will thus misinterpret it as a CAN frame. This can result in a buffer overflow. The driver will consume cf->len as-is with no further checks on these lines: usb_msg.dlc = cf->len; memcpy(usb_msg.data, cf->data, usb_msg.dlc); Here, cf->len corresponds to the flags field of the CAN XL frame. In our previous example, we set canxl_frame->flags to 0xff. Because the maximum expected length is 8, a buffer overflow of 247 bytes occurs! Populate net_device_ops->ndo_change_mtu() to ensure that the interface's MTU can not be set to anything bigger than CAN_MTU. By fixing the root cause, this prevents the buffer overflow.

Published Oct 17, 2025

https://lore.kernel.org/linux-cve-announce/2025101500-CVE-2025-39985-98c2@gregkh/


rpm	kernel	4.18.0-147.0.2.el8_1
rpm	kernel	4.18.0-147.0.3.el8_1
rpm	kernel	4.18.0-147.3.1.el8_1
rpm	kernel	4.18.0-147.5.1.el8_1
rpm	kernel	4.18.0-147.8.1.el8_1
rpm	kernel	4.18.0-147.el8
rpm	kernel	4.18.0-193.1.2.el8_2
rpm	kernel	4.18.0-193.13.2.el8_2
rpm	kernel	4.18.0-193.14.3.el8_2
rpm	kernel	4.18.0-193.19.1.el8_2
rpm	kernel	4.18.0-193.28.1.el8_2
rpm	kernel	4.18.0-193.6.3.el8_2
rpm	kernel	4.18.0-193.el8
rpm	kernel	4.18.0-240.1.1.el8_3
rpm	kernel	4.18.0-240.10.1.el8_3
rpm	kernel	4.18.0-240.15.1.el8_3
rpm	kernel	4.18.0-240.22.1.el8_3
rpm	kernel	4.18.0-240.8.1.el8_3
rpm	kernel	4.18.0-240.el8
rpm	kernel	4.18.0-293.el8
rpm	kernel	4.18.0-305.10.2.el8_4
rpm	kernel	4.18.0-305.12.1.el8_4
rpm	kernel	4.18.0-305.17.1.el8_4
rpm	kernel	4.18.0-305.19.1.el8_4
rpm	kernel	4.18.0-305.25.1.el8_4
rpm	kernel	4.18.0-305.3.1.el8_4
rpm	kernel	4.18.0-305.7.1.el8_4
rpm	kernel	4.18.0-305.el8
rpm	kernel	4.18.0-348.12.2.el8_5
rpm	kernel	4.18.0-348.2.1.el8_5
rpm	kernel	4.18.0-348.20.1.el8_5
rpm	kernel	4.18.0-348.23.1.el8_5
rpm	kernel	4.18.0-348.7.1.el8_5
rpm	kernel	4.18.0-348.el8
rpm	kernel	4.18.0-372.13.1.0.1.el8_6
rpm	kernel	4.18.0-372.13.1.0.2.el8_6
rpm	kernel	4.18.0-372.16.1.0.1.el8_6
rpm	kernel	4.18.0-372.16.1.0.2.el8_6
rpm	kernel	4.18.0-372.19.1.0.1.el8_6
rpm	kernel	4.18.0-372.19.1.0.2.el8_6
rpm	kernel	4.18.0-372.26.1.0.1.el8_6
rpm	kernel	4.18.0-372.26.1.0.2.el8_6
rpm	kernel	4.18.0-372.32.1.0.1.el8_6
rpm	kernel	4.18.0-372.32.1.0.2.el8_6
rpm	kernel	4.18.0-372.9.1.0.2.el8
rpm	kernel	4.18.0-372.9.1.el8
rpm	kernel	4.18.0-425.10.1.0.1.el8_7
rpm	kernel	4.18.0-425.10.1.el8_7
rpm	kernel	4.18.0-425.13.1.0.1.el8_7
rpm	kernel	4.18.0-425.13.1.el8_7

Ecosystem	Package	Version

Vulnerabilities

CVE-2025-39985

Published Oct 17, 2025

https://lore.kernel.org/linux-cve-announce/2025101500-CVE-2025-39985-98c2@gregkh/


rpm	kernel	4.18.0-147.0.2.el8_1
rpm	kernel	4.18.0-147.0.3.el8_1
rpm	kernel	4.18.0-147.3.1.el8_1
rpm	kernel	4.18.0-147.5.1.el8_1
rpm	kernel	4.18.0-147.8.1.el8_1
rpm	kernel	4.18.0-147.el8
rpm	kernel	4.18.0-193.1.2.el8_2
rpm	kernel	4.18.0-193.13.2.el8_2
rpm	kernel	4.18.0-193.14.3.el8_2
rpm	kernel	4.18.0-193.19.1.el8_2
rpm	kernel	4.18.0-193.28.1.el8_2
rpm	kernel	4.18.0-193.6.3.el8_2
rpm	kernel	4.18.0-193.el8
rpm	kernel	4.18.0-240.1.1.el8_3
rpm	kernel	4.18.0-240.10.1.el8_3
rpm	kernel	4.18.0-240.15.1.el8_3
rpm	kernel	4.18.0-240.22.1.el8_3
rpm	kernel	4.18.0-240.8.1.el8_3
rpm	kernel	4.18.0-240.el8
rpm	kernel	4.18.0-293.el8
rpm	kernel	4.18.0-305.10.2.el8_4
rpm	kernel	4.18.0-305.12.1.el8_4
rpm	kernel	4.18.0-305.17.1.el8_4
rpm	kernel	4.18.0-305.19.1.el8_4
rpm	kernel	4.18.0-305.25.1.el8_4
rpm	kernel	4.18.0-305.3.1.el8_4
rpm	kernel	4.18.0-305.7.1.el8_4
rpm	kernel	4.18.0-305.el8
rpm	kernel	4.18.0-348.12.2.el8_5
rpm	kernel	4.18.0-348.2.1.el8_5
rpm	kernel	4.18.0-348.20.1.el8_5
rpm	kernel	4.18.0-348.23.1.el8_5
rpm	kernel	4.18.0-348.7.1.el8_5
rpm	kernel	4.18.0-348.el8
rpm	kernel	4.18.0-372.13.1.0.1.el8_6
rpm	kernel	4.18.0-372.13.1.0.2.el8_6
rpm	kernel	4.18.0-372.16.1.0.1.el8_6
rpm	kernel	4.18.0-372.16.1.0.2.el8_6
rpm	kernel	4.18.0-372.19.1.0.1.el8_6
rpm	kernel	4.18.0-372.19.1.0.2.el8_6
rpm	kernel	4.18.0-372.26.1.0.1.el8_6
rpm	kernel	4.18.0-372.26.1.0.2.el8_6
rpm	kernel	4.18.0-372.32.1.0.1.el8_6
rpm	kernel	4.18.0-372.32.1.0.2.el8_6
rpm	kernel	4.18.0-372.9.1.0.2.el8
rpm	kernel	4.18.0-372.9.1.el8
rpm	kernel	4.18.0-425.10.1.0.1.el8_7
rpm	kernel	4.18.0-425.10.1.el8_7
rpm	kernel	4.18.0-425.13.1.0.1.el8_7
rpm	kernel	4.18.0-425.13.1.el8_7

CVE-2025-39985 | Components Impacted | Sonatype Guide | Sonatype Guide

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CVE-2025-39985