GNU C Library Resolves 1996 Security Flaw CVE-2026-0915

Security concerns have arisen regarding the GNU C Library, commonly known as glibc. A newly disclosed vulnerability, identified as CVE-2026-0915, stems from a code issue that dates back to June 1996.

Overview of CVE-2026-0915

This vulnerability affects the functions getnetbyaddr and getnetbyaddr_r, which leak stack contents when responding to DNS resolver queries. Although the likelihood of exploiting this issue is minimal, it poses a limited risk by potentially allowing an attacker to bypass address space layout randomization (ASLR).

Key Aspects of the Vulnerability

• The vulnerability is rare, as the APIs are seldom called with a network value of zero.
• Stack memory leaks from these functions can expose adjacent stack data.
• The issue was not recognized for 30 years, underlining the code’s need for updated testing protocols.

Resolution of the Issue

Fortunately, the latest glibc Git code has addressed this security flaw. The NSS DNS back-end has been corrected to create proper DNS queries when the network value is zero, preventing uninitialized stack data from being utilized.

Recent Updates in glibc

Alongside CVE-2026-0915, another vulnerability identified as CVE-2026-0861 was disclosed this week. This issue involves a potential integer overflow due to an overly large alignment in glibc’s memalign functions, which could lead to heap corruption. However, this particular code defect was introduced in 2019 and has already been resolved in the latest updates.

Future Developments for glibc

Maintaining its commitment to security, glibc is set to release version 2.43 by early February. This update will incorporate the necessary patches for both CVE-2026-0915 and CVE-2026-0861, ensuring enhanced protection for users of the GNU C Library.

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