CVE-2026-97399

One-byte overread in strncasecmp on Power8

Published Sep 28, 2026 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Description
The strncasecmp function in the GNU C Library 2.24 and later optimized for the Power8 architecture may read one byte beyond the input size limit, which may crash a program when that byte is not readable.

This condition may happen when the input strings to the strncasecmp function are attacker controlled in an application and they match all the way up to the edge of their page and the neighbouring page is either not mapped or is not readable.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-9065-1 GNU C Library vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared The Gnu C Library
The Gnu C Library glibc
Vendors & Products The Gnu C Library
The Gnu C Library glibc
Type Values Removed Values Added
Description The strncasecmp function in the GNU C Library 2.24 and later optimized for the Power8 architecture may read one byte beyond the input size limit, which may crash a program when that byte is not readable. This condition may happen when the input strings to the strncasecmp function are attacker controlled in an application and they match all the way up to the edge of their page and the neighbouring page is either not mapped or is not readable.
Title One-byte overread in strncasecmp on Power8
Weaknesses CWE-126
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
glibc
Published
Updated
Sep 28, 2026, 5:07 PM
Reserved
Sep 24, 2026, 2:30 PM
Status
Awaiting Analysis
Published
Sep 28, 2026, 4:17 PM
Modified
Sep 29, 2026, 9:36 PM
Severity
Low
Public date
Sep 28, 2026, 3:21 PM