CVE-2021-20219

Published: 23 March 2021

A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata->read_head, and a missing sanity check) and cause a threat to the system availability.

Notes

Red Hat's backport of 3d63b7e4ae0d "n_tty: Fix stall
at n_tty_receive_char_special()." was incomplete and could result in
an infinite loop.

Status

Severity score breakdown

References

• https://www.openwall.com/lists/oss-security/2021/03/17/10
• https://www.openwall.com/lists/oss-security/2021/03/17/16
• https://www.cve.org/CVERecord?id=CVE-2021-20219
• NVD
• Launchpad
• Debian