xen: fix UAF in dmabuf_exp_from_pages()
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.
CVE-2025-38595
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38595
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
"lessThan": "ba8bc644f168509c16d48444991de7cfea3f12ec",
"versionType": "git"
},
{
"status": "affected",
"version": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
"lessThan": "e5907885260401bba300d4d18d79875c05b82651",
"versionType": "git"
},
{
"status": "affected",
"version": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
"lessThan": "3edfd2353f301bfffd5ee41066e37320a59ccc2d",
"versionType": "git"
},
{
"status": "affected",
"version": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
"lessThan": "d59d49af4aeed9a81e673e37c26c6a3bacf1a181",
"versionType": "git"
},
{
"status": "affected",
"version": "a240d6e42e28c34fdc34b3a98ca838a31c939901",
"lessThan": "532c8b51b3a8676cbf533a291f8156774f30ea87",
"versionType": "git"
}
],
"programFiles": [
"drivers/xen/gntdev-dmabuf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.42",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.10",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16.1",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/xen/gntdev-dmabuf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38595
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46006 · Revision 1
- Added to Heist Feed
- Publisher date