Linux Kernel up to 6.18.43/7.1.7/7.2-rc5 iommu/iommufd iommufd_fault_iopf_handler/iopf_group_response use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.96

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 6.18.43/7.1.7/7.2-rc5. The impacted element is the function iommufd_fault_iopf_handler/iopf_group_response of the component iommu/iommufd. Performing a manipulation results in use after free. This vulnerability is reported as CVE-2026-74520. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.18.43/7.1.7/7.2-rc5. This affects the function iommufd_fault_iopf_handler/iopf_group_response of the component iommu/iommufd. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-74520 since 08/15/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 6.18.44, 7.1.8 or 7.2-rc6 eliminates this vulnerability. Applying the patch 6da8f37419dd4c456f26fc203f04e000186f4b3d/4e74a369236424114b94cf6a9f5ff9e848b430b4/738e6f32e61d80b554e37015ecb7bc620b88001c is able to eliminate this problem.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.44/7.1.8/7.2-rc6
Patch: 6da8f37419dd4c456f26fc203f04e000186f4b3d/4e74a369236424114b94cf6a9f5ff9e848b430b4/738e6f32e61d80b554e37015ecb7bc620b88001c

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74520 (🔒)
GCVE (CVE): GCVE-0-2026-74520
GCVE (VulDB): GCVE-100-390837

Entryinfo

Created: 08/15/2026 15:32
Changes: 08/15/2026 15:32 (59)
Complete: 🔍
Cache ID: 216::103

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