An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack. This occurs because of an invalid free when the line discipline is used more than once.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1899986]
*** Bug 1901723 has been marked as a duplicate of this bug. ***