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.
References
Configurations
Configuration 1 (hide)
|
History
26 Nov 2025, 18:01
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-416 | |
| References | () https://git.kernel.org/stable/c/3edfd2353f301bfffd5ee41066e37320a59ccc2d - Patch | |
| References | () https://git.kernel.org/stable/c/532c8b51b3a8676cbf533a291f8156774f30ea87 - Patch | |
| References | () https://git.kernel.org/stable/c/d59d49af4aeed9a81e673e37c26c6a3bacf1a181 - Patch | |
| References | () https://git.kernel.org/stable/c/e5907885260401bba300d4d18d79875c05b82651 - Patch |
Information
Published : 2025-08-19 17:15
Updated : 2025-11-26 18:01
NVD link : CVE-2025-38595
Mitre link : CVE-2025-38595
CVE.ORG link : CVE-2025-38595
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free