CVE-2020-27171 Information disclosure in n/a

What is CVE-2020-27171?

CVE-2020-27171 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 20 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.

Weakness: CWE-193

Which versions are affected by CVE-2020-27171?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Linux kernel.

How do I fix CVE-2020-27171?

Apply the vendor's patch.

Is CVE-2020-27171 being exploited?

There is no known exploitation of CVE-2020-27171 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as A-183840808, AZL-6526, DEBIAN-CVE-2020-27171, GHSA-c389-x6qf-wxv2, PUB-A-183840808, UBUNTU-CVE-2020-27171.