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CVE-2020-29661

Description

A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.

POC

Reference

- http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html

- http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc

- https://www.oracle.com/security-alerts/cpuoct2021.html

Github

- https://github.com/ARPSyndicate/cvemon

- https://github.com/TLD1027/CVE-2020-29661

- https://github.com/wojkos9/arm-CVE-2020-29661