CVE-2021-46905 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: hso: fix NULL-deref on disconnect regression

Commit 8a12f8836145 ( et: hso: fix null-ptr-deref during tty device unregistration) fixed the racy minor allocation reported by syzbot but introduced an unconditional NULL-pointer dereference on every disconnect instead.

Specifically the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

Reference

https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725 https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273 https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00 https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3