What’s Vulnerable › Vulnerabilities

CVE-2020-28941

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-19 · updated 2026-06-17
• Weakness: CWE-763

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.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 32, 33
• Linux kernel: through 5.9.9

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
• 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

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