CVE-2025-2924: 
NixOS vulnerability analysis and mitigation

A vulnerability, which was classified as problematic, was found in HDF5 up to version 1.14.6. The vulnerability affects the function H5HL__fl_deserialize in the file src/H5HLcache.c. This heap-based buffer overflow vulnerability was discovered on March 16, 2025, and has been assigned CVE-2025-2924 (NVD, GitHub Issue).

The vulnerability occurs in the H5HL__fl_deserialize function when processing certain files. The issue arises because the function does not properly validate the free_block value before using it in memory operations. When calling H5_DECODE_LENGTH_LEN, if free_block contains a large number (e.g., 0xfffffffffffffffff0), it can lead to an overflow when calculating memory addresses with heap->dblk_image + free_block. The vulnerability has been assigned CVSS v4.0 score of 4.8 (MEDIUM) and CVSS v3.1 score of 3.3 (LOW) (NVD).

The exploitation of this vulnerability can lead to heap-based buffer overflow, potentially resulting in application crashes or other undefined behavior. The vulnerability affects the availability of the system, though there are no reported impacts on confidentiality or integrity (NVD).

The vulnerability requires local access to be exploited. A proof of concept (PoC) has been publicly disclosed, demonstrating how the vulnerability can be triggered using a specially crafted input file. The exploit has been confirmed through AddressSanitizer reports showing heap-buffer-overflow errors (GitHub Issue).

At the time of reporting, there is no official patch available for this vulnerability as it affects the latest version (1.14.6) of HDF5. Users are advised to monitor for updates from the HDF Group for a security patch (NVD).