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CVE-2026-97399: One-byte overread in strncasecmp on Power8

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-29
• Weakness: CWE-126

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.

Affected products

• GNU C Library (glibc): from 2.24 before 2.45 — fixed in 2.45

How to fix

Upgrade to a fixed version: GNU C Library (glibc) 2.45. Check the vendor advisory for mitigations.

References

• https://sourceware.org/bugzilla/show_bug.cgi?id=34683
• https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0024
• http://www.openwall.com/lists/oss-security/2026/09/28/7

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