CVE-2025-38595
Xen DMA Buffer UAF Vulnerability
Description
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.
INFO
Published Date :
Aug. 19, 2025, 5:15 p.m.
Last Modified :
Aug. 20, 2025, 2:40 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
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CVE-2025-38595
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CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38595
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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approaches employed by adversaries to exploit the CVE-2025-38595
weaknesses.
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CVE-2025-38595
vulnerability anywhere in the article.
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CVE-2025-38595
vulnerability over time.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 19, 2025
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/3edfd2353f301bfffd5ee41066e37320a59ccc2d Added Reference https://git.kernel.org/stable/c/532c8b51b3a8676cbf533a291f8156774f30ea87 Added Reference https://git.kernel.org/stable/c/d59d49af4aeed9a81e673e37c26c6a3bacf1a181 Added Reference https://git.kernel.org/stable/c/e5907885260401bba300d4d18d79875c05b82651