One-byte overread in strncasecmp on Power8

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97399
StatePUBLISHED
Assignerglibc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-28 16:17:18 UTC
Updated2026-09-29 21:36:39 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from 3ff69d7a-14f2-4f67-a097-88dee7810d18

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

EPSS: 0.002920000 probability, percentile 0.195220000 (date 2026-09-29)

Problem Types: CWE-126 | CWE-126 CWE-126 Buffer over-read

VersionSourceTypeScoreSeverityVector
3.13ff69d7a-14f2-4f67-a097-88dee7810d18Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The GNU C Library Glibc affected 2.24 2.45 custom Power8

References

ReferenceSourceLinkTags
sourceware.org/git 3ff69d7a-14f2-4f67-a097-88dee7810d18 sourceware.org
www.openwall.com/lists/oss-security/2026/09/28/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
sourceware.org/bugzilla/show_bug.cgi 3ff69d7a-14f2-4f67-a097-88dee7810d18 sourceware.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: AISLE in partnership with Red Hat (en)

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