Memory Management Vulnerability in Linux Kernel by The Linux Foundation
CVE-2026-23380
What is CVE-2026-23380?
In the Linux kernel, a vulnerability exists related to memory management during the forking of processes. When a process forks, the child process duplicates the parent's virtual memory areas (VMAs). However, the user_mapped reference count is not incremented appropriately. This oversight leads to a double invocation of the tracing_buffers_mmap_close function when both parent and child exit, resulting in a WARN_ON condition due to an already zero user_mapped reference count. Although this typically isn't problematic as memory is mapped with the VM_DONTCOPY hint, applications may rewrite this behavior using madvise(MADVISE_DOFORK), thus potentially exposing the issue during process forking. A fix has been implemented to ensure that the user_mapped reference count is incremented appropriately without needing to remap the pages.
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Affected Version(s)
Linux cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 < 91f3e8d84c89918769e71393f839c9fefadc2580
Linux cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64
Linux cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64