CVE & CISA-KEV Catalog

CVE-2020-15706

MEDIUM
6.4
CVSS v3
NVD

Description

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.

CWE-362Race ConditionCWE-416Use After Free

How to fix

Remediation Available
grub2Debian
Fixed in:2.04-9CVE-2020-15706
Fixed in:2.04-9CVE-2020-15706
Fixed in:2.04-9CVE-2020-15706
Fixed in:2.04-9CVE-2020-15706
grub-efi-amd64-binUbuntu
Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1
Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:2.02-2ubuntu8.16USN-4432-1
Fixed in:2.04-1ubuntu26.1USN-4432-1
grub-efi-amd64-signedUbuntu
Fixed in:1.34.22+2.02~beta2-9ubuntu1.20USN-4432-1
Fixed in:1.66.26+2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:1.93.18+2.02-2ubuntu8.16USN-4432-1
Fixed in:1.142.3+2.04-1ubuntu26.1USN-4432-1
grub-efi-arm-binUbuntu
Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1
Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:2.02-2ubuntu8.16USN-4432-1
Fixed in:2.04-1ubuntu26.1USN-4432-1
grub-efi-arm64-binUbuntu
Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1
Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:2.02-2ubuntu8.16USN-4432-1
Fixed in:2.04-1ubuntu26.1USN-4432-1
grub-efi-arm64-signedUbuntu
Fixed in:1.66.26+2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:1.93.18+2.02-2ubuntu8.16USN-4432-1
Fixed in:1.142.3+2.04-1ubuntu26.1USN-4432-1
grub-efi-ia32-binUbuntu
Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1
Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:2.02-2ubuntu8.16USN-4432-1
Fixed in:2.04-1ubuntu26.1USN-4432-1
grub2Ubuntu
Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1
Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1
Fixed in:2.02-2ubuntu8.16USN-4432-1
Fixed in:2.04-1ubuntu26.1USN-4432-1
grub2-signedUbuntu
Fixed in:1.34.22USN-4432-1
Fixed in:1.66.26USN-4432-1
Fixed in:1.93.18USN-4432-1
Fixed in:1.142.3USN-4432-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

0.98%probability of exploitation in 30 days
58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-6387High8.1100%-Fix
CVE-2023-36884High7.599%KEV + RansomFix
CVE-2018-15473Medium5.399%-Fix
CVE-2024-27983High8.287%-Fix
CVE-2014-0226Medium6.886%-Fix
CVE-2016-5195High7.084%KEVFix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.