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Vulnerability DatabaseCVE-2025-38592
CVE-2025-38592:
Linux Kernel vulnerability analysis and mitigation
Overview
A vulnerability in the Linux kernel's Bluetooth subsystem was discovered and resolved on August 19, 2025. The issue affects the hci_devcd_dump function, specifically related to out-of-bounds access via dev_coredumpv. The vulnerability is tracked as CVE-2025-38592 (NVD).
Technical details
The vulnerability stems from a race condition where both dev_coredumpv and skb_put_data functions in hci_devcd_dump use hdev->dump.head. The dev_coredumpv function can free the buffer if the data hasn't been read by userspace yet, leading to a vmalloc-out-of-bounds error when skb_put_data attempts to access the freed hdev->dump.head. This results in a KASAN (Kernel Address Sanitizer) reported out-of-bounds access (NVD).
Impact
When exploited, this vulnerability can lead to a kernel crash due to vmalloc-out-of-bounds memory access, potentially affecting system stability and security (NVD).
Mitigation and workarounds
The fix involves reordering the dev_coredumpv call to occur after skb_put_data, preventing the race condition where the buffer could be freed before access. This has been implemented in the kernel patches (NVD).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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