Description

In the Linux kernel, the following vulnerability has been resolved: can: isotp: check CAN address family in isotp_bind() Add missing check to block non-AF_CAN binds. Syzbot created some code which matched the right sockaddr struct size but used AF_XDP (0x2C) instead of AF_CAN (0x1D) in the address family field: bind$xdp(r2, &(0x7f0000000540)={0x2c, 0x0, r4, 0x0, r2}, 0x10) ^^^^ This has no funtional impact but the userspace should be notified about the wrong address family field content.

References 5

• git.kernel.org https://git.kernel.org/stable/c/2fc6f337257f4f7c21ecff429241f7acaa6df4e8
• git.kernel.org https://git.kernel.org/stable/c/9427584c2f153d0677ef3bad6f44028c60d728c4
• git.kernel.org https://git.kernel.org/stable/c/c6adf659a8ba85913e16a571d5a9bcd17d3d1234
• git.kernel.org https://git.kernel.org/stable/c/dd4faace51e41a82a8c0770ee0cc26088f9d9d06
• git.kernel.org https://git.kernel.org/stable/c/de3c02383aa678f6799402ac47fdd89cf4bfcaa9

Remediation