Linux Kernel up to 6.12.104/6.18.43/7.1.7 iommufd device.c iommufd_hwpt_replace_device hwpt function call with incorrect argument type

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.41

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 6.12.104/6.18.43/7.1.7. Affected by this issue is the function iommufd_hwpt_replace_device of the file device.c of the component iommufd. Such manipulation of the argument hwpt leads to function call with incorrect argument type. This vulnerability is uniquely identified as CVE-2026-80894. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.104/6.18.43/7.1.7 and classified as very critical. Affected by this issue is the function iommufd_hwpt_replace_device of the file device.c of the component iommufd. The manipulation of the argument hwpt with an unknown input leads to a function call with incorrect argument type vulnerability. Using CWE to declare the problem leads to CWE-686. The product calls a function, procedure, or routine, but the caller specifies an argument that is the wrong data type, which may lead to resultant weaknesses. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix wrong hwpt passed to iommufd_auto_response_faults on replace iommufd_hwpt_replace_device() calls: iommufd_auto_response_faults(hwpt, old_handle); passing the *new* hwpt together with the handle of the device's *old* domain. This should be a parameter mismatch: 1. Semantically, iommufd_auto_response_faults(x, handle) scans x->fault's deliver list and response xarray for groups matching "handle". A group is queued under the hwpt that was attached at fault-delivery time. old_handle is fetched *before* the domain switch, so its group lives on old->fault, not on the new hwpt->fault. 2. Historically, the first argument was "old". The routine was introduced by commit b7d8833677ba ("iommufd: Fault-capable hwpt attach/detach/replace") as __fault_domain_replace_dev() in fault.c, correctly calling iommufd_auto_response_faults(old, curr). Commit fb21b1568ada ("iommufd: Make attach_handle generic than fault specific") moved this into iommufd_hwpt_replace_device() in device.c and swapped it to "hwpt". This should be a refactor regression, not an intentional change. Fix this by passing "old" instead.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-80894 since 08/26/2026. The exploitation is known to be easy. The attack needs to be approached locally. Additional levels of successful authentication are required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/04/2026).

Upgrading to version 6.12.105, 6.18.44 or 7.1.8 eliminates this vulnerability. Applying the patch adb87155b67f9759ff010c0a99559f5bffa45dcf/564ac339c0f8bada4e77a57a92bab9d3df635e07/8eb077025279304268bd58657f0af3d388822b21/ba5c0f28a26e7d9be1e0997f8920dd638e2782fd 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: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
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: Function call with incorrect argument type
CWE: CWE-686
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 6.12.105/6.18.44/7.1.8
Patch: adb87155b67f9759ff010c0a99559f5bffa45dcf/564ac339c0f8bada4e77a57a92bab9d3df635e07/8eb077025279304268bd58657f0af3d388822b21/ba5c0f28a26e7d9be1e0997f8920dd638e2782fd

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80894 (🔒)
GCVE (CVE): GCVE-0-2026-80894
GCVE (VulDB): GCVE-100-399092

Entryinfo

Created: 09/04/2026 19:34
Changes: 09/04/2026 19:34 (61)
Complete: 🔍
Cache ID: 216::103

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