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

Quick assessment

Affected
The GNU C Library glibc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNU C Library 2.24 及更高版本中针对 Power8 架构优化的 函数可能会读取超出输入大小限制的额外一个字节。如果该字节不可读，可能会导致程序崩溃。 这种情况可能发生在以下场景中：应用程序中传入 函数的输入字符串由攻击者控制，且这两个字符串的内容一直匹配到内存页的边界，而相邻的内存页要么未映射，要么不可读。

CVSS 3.7 · Low

Possible ATT&CK Techniques 1 AI

T1408.001

Affected Version Matrix 1

VendorProduct Version RangeStatus
The GNU C Library glibc 2.24< 2.45 affected
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I. Basic Information for CVE-2026-97399

Vulnerability Information
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Vulnerability Title
One-byte overread in strncasecmp on Power8
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The GNU C Library glibc 2.24 ~ 2.45 -

II. Public POCs for CVE-2026-97399

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III. Intelligence Information for CVE-2026-97399

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Vendor Advisories for CVE-2026-97399 (1)

Other References for CVE-2026-97399 (1)

IV. Related Vulnerabilities

Same product: glibc
Same vendor: The GNU C Library
Same weakness: CWE-126

V. Comments for CVE-2026-97399

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