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.
References
Configurations
Configuration 1 (hide)
|
History
25 Nov 2025, 21:47
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| CWE | CWE-416 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/33927f3d0ecdcff06326d6e4edb6166aed42811c - Patch | |
| References | () https://git.kernel.org/stable/c/40deceb38f9db759772d1c289c28fd2a543f57fc - Patch | |
| References | () https://git.kernel.org/stable/c/55c232d7e0241f1d5120b595e7a9de24c75ed3d8 - Patch | |
| References | () https://git.kernel.org/stable/c/c07886761fd6251db6938d4e747002e3d150d231 - Patch |
Information
Published : 2025-09-04 16:15
Updated : 2025-11-25 21:47
NVD link : CVE-2025-38722
Mitre link : CVE-2025-38722
CVE.ORG link : CVE-2025-38722
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free