CVE-2020-28941

MEDIUM

Linux Kernel < 5.9.9 - Use-After-Free in Speakup TTY Line Discipline

Title source: llm
STIX 2.1

Description

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, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.

References (8)

Core 8
Core References
Mailing List, Patch, Third Party Advisory x_refsource_misc
https://www.openwall.com/lists/oss-security/2020/11/19/3
Mailing List, Patch, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2020/11/19/5
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html

Scores

CVSS v3 5.5
EPSS 0.0033
EPSS Percentile 24.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-763
Status published
Products (4)
debian/debian_linux 9.0
fedoraproject/fedora 32
fedoraproject/fedora 33
linux/linux_kernel < 5.9.9
Published Nov 19, 2020
Tracked Since Feb 18, 2026