CVE-2025-38722
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the habanalabs driver in the Linux kernel, a use-after-free (UAF) vulnerability was found in the export_dmabuf() function. After inserting a file reference into the descriptor table, another thread could close the file, and then the function continued to access objects that may have already been destroyed.
Risk Assessment
An attacker could exploit this vulnerability to access already freed memory, potentially leading to arbitrary code execution in kernel context or system crash.
Recommendation
Update the Linux kernel to a version containing the fix that changes the order of operations: reserve the descriptor before creating the file, and call fd_install() only after everything is set up.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: habanalabs: fix UAF in export_dmabuf() 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(). habanalabs export_dmabuf() calls it and then proceeds to access the objects destroyed on close. In particular, it grabs an extra reference to another struct file that will be dropped as part of ->release() for ours; that "will be" is actually "might have already been". Fix that by reserving descriptor before anything else and do fd_install() only when everything had been set up. As a side benefit, we no longer have the failure exit with file already created, but reference to underlying file (as well as ->dmabuf_export_cnt, etc.) not grabbed yet; unlike dma_buf_fd(), fd_install() can't fail.