CVE-2025-38595

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Source
https://cve.org/CVERecord?id=CVE-2025-38595
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38595.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-38595
Downstream
Related
Published
2025-08-19T17:03:25.527Z
Modified
2026-03-20T12:42:55.903838Z
Summary
xen: fix UAF in dmabuf_exp_from_pages()
Details

In the Linux kernel, the following vulnerability has been resolved:

xen: fix UAF in dmabufexpfrom_pages()

[dmabuffd() 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.

dmabuffd() is a combination of reserving a descriptor and fdinstall(). gntdev dmabufexpfrompages() 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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38595.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
a240d6e42e28c34fdc34b3a98ca838a31c939901
Fixed
e5907885260401bba300d4d18d79875c05b82651
Fixed
3edfd2353f301bfffd5ee41066e37320a59ccc2d
Fixed
d59d49af4aeed9a81e673e37c26c6a3bacf1a181
Fixed
532c8b51b3a8676cbf533a291f8156774f30ea87

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38595.json"