CVE-2025-38595
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Xen driver (gntdev), there is a use-after-free (UAF) vulnerability in the dmabuf_exp_from_pages() function. After calling dma_buf_fd() and fd_install(), objects like gntdev_dmabuf can be destroyed by closing the descriptor, and then are still used.
Risk Assessment
An attacker could exploit this vulnerability for privilege escalation or arbitrary code execution in kernel context via a race condition between threads.
Recommendation
Apply the Linux kernel patch for CVE-2025-38595, which moves fd_install() to the end of the function, after all objects are fully set up.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: xen: fix UAF in dmabuf_exp_from_pages() [dma_buf_fd() fixes; no preferences regarding the tree it goes through - up to xen folks] As soon as we'd inserted a file reference into descriptor table, another thread could close it. That's fine for the case when all we are doing is returning that descriptor to userland (it's a race, but it's a userland race and there's nothing the kernel can do about it). However, if we follow fd_install() with any kind of access to objects that would be destroyed on close (be it the struct file itself or anything destroyed by its ->release()), we have a UAF. dma_buf_fd() is a combination of reserving a descriptor and fd_install(). gntdev dmabuf_exp_from_pages() calls it and then proceeds to access the objects destroyed on close - starting with gntdev_dmabuf itself. Fix that by doing reserving descriptor before anything else and do fd_install() only when everything had been set up.