In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: 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(). https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00 https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3 https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725 https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273 https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2266260]
This was fixed for Fedora with the 5.11.17 stable kernel updates.