https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 01 Oct 2026 22:36:02 +0000 https://vulnerability.circl.lu/vuln/cve-2026-23380 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>tracing: Fix WARN_ON in tracing_buffers_mmap_close</p> <p>When a process forks, the child process copies the parent&#39;s VMAs but the user_mapped reference count is not incremented. As a result, when both the parent and child processes exit, tracing_buffers_mmap_close() is called twice. On the second call, user_mapped is already 0, causing the function to return -ENODEV and triggering a WARN_ON.</p> <p>Normally, this isn&#39;t an issue as the memory is mapped with VM_DONTCOPY set. But this is only a hint, and the application can call madvise(MADVISE_DOFORK) which resets the VM_DONTCOPY flag. When the application does that, it can trigger this issue on fork.</p> <p>Fix it by incrementing the user_mapped reference count without re-mapping the pages in the VMA&#39;s open callback.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>tracing: Fix WARN_ON in tracing_buffers_mmap_close</p> <p>When a process forks, the child process copies the parent&#39;s VMAs but the user_mapped reference count is not incremented. As a result, when both the parent and child processes exit, tracing_buffers_mmap_close() is called twice. On the second call, user_mapped is already 0, causing the function to return -ENODEV and triggering a WARN_ON.</p> <p>Normally, this isn&#39;t an issue as the memory is mapped with VM_DONTCOPY set. But this is only a hint, and the application can call madvise(MADVISE_DOFORK) which resets the VM_DONTCOPY flag. When the application does that, it can trigger this issue on fork.</p> <p>Fix it by incrementing the user_mapped reference count without re-mapping the pages in the VMA&#39;s open callback.</p> https://vulnerability.circl.lu/vuln/cve-2026-23380