CVE-2020-28941

MEDIUM

Linux Kernel < 5.9.9 - Denial of Service

Title source: rule

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)

[Patch, Vendor Advisory] https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-linus&id=d4122754442799187d5d537a9c039a49a67e57f1

[Mailing List, Patch, Third Party Advisory] https://www.openwall.com/lists/oss-security/2020/11/19/3

[Patch, Third Party Advisory] https://github.com/torvalds/linux/commit/d4122754442799187d5d537a9c039a49a67e57f1

View Patch ZIP pw:eip

[Patch, Vendor Advisory] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d4122754442799187d5d537a9c039a49a67e57f1

[Mailing List, Patch, Third Party Advisory] http://www.openwall.com/lists/oss-security/2020/11/19/5

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html

Scores

CVSS v3 5.5

EPSS 0.0006

EPSS Percentile 19.1%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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