6.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-0395

CVE-2025-0395: When the assert() function in the GNU C Library versions 2.13 to 2.40 fails, it does not allocate...

When the assert() function in the GNU C Library versions 2.13 to 2.40 fails, it does not allocate enough space for the assertion failure message string and size information, which may lead to a buffer overflow if the message string size aligns to page size.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-0395

CVE-2025-0395:

6.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The analysis is based on the provided patch information from the glibc mailing list and the detailed explanation from the Qualys security advisory. Both sources point to an incorrect buffer size calculation in mmap calls within __assert_fail_base and __libc_message_impl. The calculation failed to include space for the size field of struct abort_msg_s before the actual message string was copied, leading to a potential buffer overflow. The patch rectifies this by changing the size calculation to total = ALIGN_UP (total + sizeof (struct abort_msg_s) + 1, GLRO(dl_pagesize));, explicitly including space for the struct (which covers the size field) and the null terminator before alignment. The identified functions are those directly containing this flawed logic and subsequently patched.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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