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CVE-2026-80894— iommufd: Fix wrong hwpt passed to iommufd_auto_response_faults on replace

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于iommufd_hwpt_replace_device()函数在替换设备时错误地将新的hwpt与设备旧域的old_handle传递给iommufd_auto_response_faults()，导致参数不匹配，可能造成故障响应处理异常。

AI Predicted 4.4 Difficulty: Hard EPSS 0.17% · P6

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 6d11543bf37abdf60b8e6022a62fccfb82a5fe2e< adb87155b67f9759ff010c0a99559f5bffa45dcf affected
fb21b1568adaa76af7a8c853f37c60fba8b28661< 564ac339c0f8bada4e77a57a92bab9d3df635e07 affected
fb21b1568adaa76af7a8c853f37c60fba8b28661< 8eb077025279304268bd58657f0af3d388822b21 affected
fb21b1568adaa76af7a8c853f37c60fba8b28661< ba5c0f28a26e7d9be1e0997f8920dd638e2782fd affected
1e0216b6a58c79b5ee91c78706d5f560e4d1f56f affected
4b23c4b991eb90cc7bca42e9f81142feedd4bb56 affected
6.12.24< 6.12.105 affected
6.13.12< 6.14 affected
… +7 more rows
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I. Basic Information for CVE-2026-80894

Vulnerability Information
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Vulnerability Title
iommufd: Fix wrong hwpt passed to iommufd_auto_response_faults on replace
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于iommufd_hwpt_replace_device()函数在替换设备时错误地将新的hwpt与设备旧域的old_handle传递给iommufd_auto_response_faults()，导致参数不匹配，可能造成故障响应处理异常。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6d11543bf37abdf60b8e6022a62fccfb82a5fe2e ~ adb87155b67f9759ff010c0a99559f5bffa45dcf -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-80894

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III. Intelligence Information for CVE-2026-80894

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Patches & Fixes for CVE-2026-80894 (4)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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