3.7Low

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

The GNU C Library glibc Published: (1 month ago)

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.

Weakness (CWE): CWE-126

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
The GNU C Library glibc 2.24 – < 2.45

Ubuntu fixes

  • USN-9065-1 GNU C Library vulnerabilities Ubuntu 26.10, 26.04, 24.04, 22.04 · 12.11.2026 · glibc

References and patches