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CVE-2020-27171

MEDIUMCVSS 6/10EPSS 0.58%

Last modified

CVE-2020-27171 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

EPSS Probability
0.58%

43.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel< 5.11.8
FedoraprojectFedora32
FedoraprojectFedora33
FedoraprojectFedora34
DebianDebian Linux9.0
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-27171?
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.
How severe is CVE-2020-27171?
CVE-2020-27171 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27171?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27171?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST