Answer in brief
CVE-2026-74520 records a Unknown severity vulnerability in iommu/iommufd: Fix IOPF group ownership UAF. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=34765cbc679c59ea5d952d738d2d16bf4aadc497 <6da8f37419dd4c456f26fc203f04e000186f4b3d || >=34765cbc679c59ea5d952d738d2d16bf4aadc497 <4e74a369236424114b94cf6a9f5ff9e848b430b4 || >=34765cbc679c59ea5d952d738d2d16bf4aadc497 <738e6f32e61d80b554e37015ecb7bc620b88001c | 6da8f37419dd4c456f26fc203f04e000186f4b3d, 4e74a369236424114b94cf6a9f5ff9e848b430b4, 738e6f32e61d80b554e37015ecb7bc620b88001c |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74520 records a Unknown severity vulnerability in iommu/iommufd: Fix IOPF group ownership UAF. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=34765cbc679c59ea5d952d738d2d16bf4aadc497 <6da8f37419dd4c456f26fc203f04e000186f4b3d || >=34765cbc679c59ea5d952d738d2d16bf4aadc497 <4e74a369236424114b94cf6a9f5ff9e848b430b4 || >=34765cbc679c59ea5d952d738d2d16bf4aadc497 <738e6f32e61d80b554e37015ecb7bc620b88001c | 6da8f37419dd4c456f26fc203f04e000186f4b3d, 4e74a369236424114b94cf6a9f5ff9e848b430b4, 738e6f32e61d80b554e37015ecb7bc620b88001c |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.