CVE-2020-28941
Published: November 19, 2020Last modified: November 8, 2023
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Not affected (6.1.50-r0) |
| Stream | linux-lts | Not affected (6.1.50-r0) |
References
- http://www.openwall.com/lists/oss-security/2020/11/19/5
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d4122754442799187d5d537a9c039a49a67e57f1
- https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-linus&id=d4122754442799187d5d537a9c039a49a67e57f1
- https://github.com/torvalds/linux/commit/d4122754442799187d5d537a9c039a49a67e57f1
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
- https://www.openwall.com/lists/oss-security/2020/11/19/3