What’s Vulnerable › Vulnerabilities

CVE-2020-27830

• 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: 2021-05-13 · updated 2026-06-17
• Weakness: CWE-476

Description

A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref crash.

Affected products

• Debian Linux: 9.0, 10.0
• Linux kernel: before 5.9.14 — fixed in 5.9.14

How to fix

Upgrade to a fixed version: Linux kernel 5.9.14. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/12/08/1
• http://www.openwall.com/lists/oss-security/2020/12/08/4
• https://bugzilla.redhat.com/show_bug.cgi?id=1919900
• https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
• https://security.netapp.com/advisory/ntap-20210625-0004/
• https://www.debian.org/security/2021/dsa-4843
• http://www.openwall.com/lists/oss-security/2020/12/08/1
• http://www.openwall.com/lists/oss-security/2020/12/08/4
• https://bugzilla.redhat.com/show_bug.cgi?id=1919900
• https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
• https://security.netapp.com/advisory/ntap-20210625-0004/
• https://www.debian.org/security/2021/dsa-4843

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