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Vulnerability DatabaseCVE-2025-39781
CVE-2025-39781:
CBL Mariner vulnerability analysis and mitigation
Overview
CVE-2025-39781 was disclosed on September 11, 2025, affecting the Linux kernel. The vulnerability involves a warning trigger in the parisc architecture's flushcachevmap functionality, specifically related to the WARNONONCE() implementation (NVD, Ubuntu).
Technical details
The vulnerability exists in the Linux kernel's parisc architecture implementation, specifically in the flushcachevmap function where a WARNONONCE() warning was observed to occasionally trigger (Debian).
Impact
The vulnerability affects multiple Linux distributions including Ubuntu, Debian, and their derivatives. Several kernel versions are marked as vulnerable, including various Ubuntu packages such as linux-azure, linux-aws, and linux-gcp (Ubuntu).
Mitigation and workarounds
Various Linux distributions have taken different approaches to address this vulnerability. Ubuntu has marked several kernel packages as requiring updates, while others have been superseded by newer versions. For example, linux-hwe-6.8 and linux-azure-6.8 are marked as vulnerable and requiring updates (Ubuntu).
Additional resources
Source: This report was generated using AI
Related CBL Mariner vulnerabilities:
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