CVE-2020-6096

glibc: signed comparison vulnerability in the ARMv7 memcpy function

Published Apr 1, 2020 CVSS 3.1 · 8.1 High EPSS 5.5% KEV · Not listed
Description
An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3152-1 glibc security update
EUVD EUVD EUVD-2020-27250 An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.
Ubuntu USN Ubuntu USN USN-4954-1 GNU C Library vulnerabilities
Ubuntu USN Ubuntu USN USN-5310-1 GNU C Library vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Sources

Status
PUBLISHED
Assigner
talos
Published
Updated
Oct 14, 2026, 8:06 AM
Reserved
Jan 7, 2020, 12:00 AM
Status
Modified
Published
Apr 1, 2020, 10:15 PM
Modified
Oct 14, 2026, 9:17 AM
Severity
Moderate
Public date
Mar 2, 2020, 12:00 AM