iommufd: Avoid locking internal accesses during unmap
In the Linux kernel, the following vulnerability has been resolved: iommufd: Avoid locking internal accesses during unmap iommufd_access_notify_unmap() skips internal accesses because they do not have an external unmap callback to invoke. However, the current test calls iommufd_lock_obj() before checking whether the access is internal. If iommufd_lock_obj() succeeds, the loop then sees the internal access and continues, bypassing the matching iommufd_put_object() used by the normal unmap path. This leaks the object reference taken by iommufd_lock_obj(). Check for internal accesses first so skipped entries are never locked.
CVE-2026-89447
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-2026-89447
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": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0",
"lessThan": "436189ee4bb2c7c993b945d68570dd38c3e4349e",
"versionType": "git"
},
{
"status": "affected",
"version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0",
"lessThan": "50a66a63d1c841ae6b28a4551f642c1bba4c9529",
"versionType": "git"
},
{
"status": "affected",
"version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0",
"lessThan": "0dbcdf4473a614adbd732d567c9b39ac0e040e0c",
"versionType": "git"
}
],
"programFiles": [
"drivers/iommu/iommufd/device.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/iommu/iommufd/device.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89447
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34980 · Revision 1
- Added to Heist Feed
- Publisher date