Bug 2542525 (CVE-2026-97399)

Summary: CVE-2026-97399 glibc: glibc: Denial of Service via out-of-bounds read in strncasecmp
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, ashankar, codonell, dj, dpaolell, fweimer, jdelft, jupierce, lgarciaa, mbiarnes, pfrankli, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in glibc. In builds optimized for specific hardware architectures, the string comparison function strncasecmp may read one byte beyond the boundary of the provided input string. An attacker capable of passing controlled strings that end at the edge of a memory page could trigger an invalid memory access and crash the application, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-28 15:32:11 UTC 
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.