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CVE-2020-28941

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Date: November 19, 2020

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.

Language: C

Severity Score

Related Resources (14)

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
http://www.openwall.com/lists/oss-security/2020/11/19/5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-linus&id=d4122754442799187d5d537a9c039a49a67e57f1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d4122754442799187d5d537a9c039a49a67e57f1
https://www.openwall.com/lists/oss-security/2020/11/19/3
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
https://nvd.nist.gov/vuln/detail/CVE-2020-28941
https://github.com/torvalds/linux/commit/d4122754442799187d5d537a9c039a49a67e57f1
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-28941
https://security-tracker.debian.org/tracker/CVE-2020-28941
https://www.mend.io/vulnerability-database/CVE-2020-28941

Severity Score

Weakness Type (CWE)

Release of Invalid Pointer or Reference

CWE-763

Top Fix

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Upgrade Version

Upgrade to version linux-libc-headers - 5.10

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): COMPLETE
Additional information:

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