iommu/iommufd: Fix IOPF group ownership UAF
In the Linux kernel, the following vulnerability has been resolved: iommu/iommufd: Fix IOPF group ownership UAF iopf_group_alloc() links each last-page IOPF group into the generic IOPF pending list before invoking the domain fault handler. iommufd_fault_iopf_handler() also queued an accepted group in the IOMMUFD deliver list without removing it from the generic pending list. When detach or HWPT replacement drops the device's IOPF reference count to zero, an IOMMU driver may call iopf_queue_remove_device(). That function responds to and frees groups through the generic pending list without removing the same groups from IOMMUFD's deliver list or response xarray. A later read, response, or cleanup can then access the freed group and cause a UAF. Fix this by dequeuing an accepted group from the generic pending list before IOMMUFD queues it for userspace response. Make iopf_group_response() send a response regardless of pending-list membership, so the dequeued group can still be completed by IOMMUFD.
CVE-2026-74520
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-2026-74520
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": "34765cbc679c59ea5d952d738d2d16bf4aadc497",
"lessThan": "8563099bc4b03e1894a983a394225d69b05d9277",
"versionType": "git"
},
{
"status": "affected",
"version": "34765cbc679c59ea5d952d738d2d16bf4aadc497",
"lessThan": "6da8f37419dd4c456f26fc203f04e000186f4b3d",
"versionType": "git"
},
{
"status": "affected",
"version": "34765cbc679c59ea5d952d738d2d16bf4aadc497",
"lessThan": "4e74a369236424114b94cf6a9f5ff9e848b430b4",
"versionType": "git"
},
{
"status": "affected",
"version": "34765cbc679c59ea5d952d738d2d16bf4aadc497",
"lessThan": "738e6f32e61d80b554e37015ecb7bc620b88001c",
"versionType": "git"
}
],
"programFiles": [
"drivers/iommu/io-pgfault.c",
"drivers/iommu/iommufd/eventq.c",
"include/linux/iommu.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/iommu/io-pgfault.c",
"drivers/iommu/iommufd/eventq.c",
"include/linux/iommu.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74520
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46565 · Revision 1
- Added to Heist Feed
- Publisher date