cbcvebase.
CVE-2025-39987
published 2025-10-15

CVE-2025-39987: In the Linux kernel, the following vulnerability has been resolved: can: hi311x: populate ndo_change_mtu() to prevent buffer overflow Sending an PF_PACKET…

PriorityP345high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.16%
6.1th percentile
In the Linux kernel, the following vulnerability has been resolved: can: hi311x: 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 sun4i_can 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, hi3110_hard_start_xmit() receives a CAN XL frame which it is not able to correctly handle and will thus misinterpret it as a CAN frame. The driver will consume frame->len as-is with no further checks. This can result in a buffer overflow later on in hi3110_hw_tx() on this line: memcpy(buf + HI3110_FIFO_EXT_DATA_OFF, frame->data, frame->len); Here, frame->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.

Affected

30 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.158-1 (bookworm)linux 6.1.158-1 (bookworm)
debianlinux-6.1< linux 6.1.158-1 (bookworm)linux 6.1.158-1 (bookworm)
linuxlinux
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < f2c247e9581024d8b3dd44cbe086bf2bebbef42cf2c247e9581024d8b3dd44cbe086bf2bebbef42c
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < 8f351db6b2367991f0736b2cff082f5de48721138f351db6b2367991f0736b2cff082f5de4872113
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < 7ab85762274c0fa997f0ef9a2307b2001aae43c47ab85762274c0fa997f0ef9a2307b2001aae43c4
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < 57d332ce8c921d0e340650470bb0c1d707f216ee57d332ce8c921d0e340650470bb0c1d707f216ee
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < be1b25005fd0f9d4e78bec6695711ef87ee33398be1b25005fd0f9d4e78bec6695711ef87ee33398
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < def814b4ba31b563584061d6895d5ff447d5bc14def814b4ba31b563584061d6895d5ff447d5bc14
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < e77fdf9e33a83a08f04ab0cb68c19ddb365a622fe77fdf9e33a83a08f04ab0cb68c19ddb365a622f
linuxlinux>= 57e83fb9b7468c75cb65cde1d23043553c346c6d < ac1c7656fa717f29fac3ea073af63f0b9919ec9aac1c7656fa717f29fac3ea073af63f0b9919ec9a
linuxlinux_kernel>= 0 < 5.10.247-15.10.247-1
linuxlinux_kernel>= 0 < 6.1.158-16.1.158-1
linuxlinux_kernel>= 0 < 6.12.57-16.12.57-1
linuxlinux_kernel>= 0 < 6.16.10-16.16.10-1
linuxlinux_kernel>= 0 < 5.15.0-170.1805.15.0-170.180
linuxlinux_kernel>= 0 < 6.8.0-106.1066.8.0-106.106
linuxlinux_kernel>= 4.12.0 < 5.4.3005.4.300
linuxlinux_kernel>= 5.11.0 < 5.15.1945.15.194
linuxlinux_kernel>= 5.16.0 < 6.1.1556.1.155
linuxlinux_kernel>= 5.5.0 < 5.10.2455.10.245
linuxlinux_kernel>= 6.13.0 < 6.16.106.16.10
linuxlinux_kernel>= 6.2.0 < 6.6.1096.6.109
linuxlinux_kernel>= 6.7.0 < 6.12.506.12.50
msrcazl3_kernel_6.6.104.2-4_on_azure_linux_3.0

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_msrc7.3HIGH
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