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CVE-2026-90242— iommu/vt-d: Fix iopf_refcount leak on RID domain replacement

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.

在 Linux 内核中，已修复以下漏洞： iommu/vt-d：修复在 RID 域替换时发生的 iopf_refcount 泄漏问题 函数会为新域启用 IOPF（IO Page Fault，IO 页错误处理），但从未为旧域禁用 IOPF。在函数开头调用的 会拆除转换（tear down translation），但不会触及任何 IOPF 状态；正是出于这个原因， 必须在调用它之前显式调用 。 存在相同的问题。其注释声称，由于设备已被置于阻塞状态，因此不需要进行 PRI（Page Request Interface，

AI Predicted 3.1 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1486 · Data Encrypted for Impact

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 17fce9d2336d952b95474248303e5e7d9777f2e0< 143cd37ce76527ddd6f6dbac4a89bde31fb8b0dc affected
17fce9d2336d952b95474248303e5e7d9777f2e0< 236dd58fabd2e951b940a6ad88b81147899ed311 affected
6.16 affected
< 6.16 unaffected
7.2.6≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-90242

Vulnerability Information
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Vulnerability Title
iommu/vt-d: Fix iopf_refcount leak on RID domain replacement
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix iopf_refcount leak on RID domain replacement intel_iommu_attach_device() enables IOPF for the new domain but never disables it for the old one. device_block_translation(), called at the start of the function, tears down translation but does not touch any IOPF state; blocking_domain_attach_dev() has to call iopf_for_domain_remove() explicitly before invoking it for exactly this reason. identity_domain_attach_dev() has the same problem. Its comment claims that no PRI handling is needed because the device has been put in the blocking state, but the blocking state and the IOPF reference count are independent of each other. As a result, replacing a domain that has an iopf_handler with another domain at RID level leaks a reference in info->iopf_refcount. The count never drops back to zero, so iopf_queue_remove_device() is never called and iommu_disable_pci_pri() triggers its WARN_ON(info->iopf_refcount) when the device is released. The PASID paths already handle this correctly by way of iopf_for_domain_replace(); convert the two RID paths to do the same. Using the replace helper rather than a bare remove keeps the enable before the disable, so the reference count does not transiently reach zero and evict the device from the IOPF queue.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 17fce9d2336d952b95474248303e5e7d9777f2e0 ~ 143cd37ce76527ddd6f6dbac4a89bde31fb8b0dc -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-90242

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III. Intelligence Information for CVE-2026-90242

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Patches & Fixes for CVE-2026-90242 (2)

Same Patch Batch · Linux · 2026-09-17 · 602 CVEs total

CVE-2026-90257 Bluetooth: virtio_bt: avoid OOB read of build info string
CVE-2026-90238 media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
CVE-2026-90240 iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90239 media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
CVE-2026-90241 iommu/vt-d: Tear down scalable-mode context on probe failure
CVE-2026-90243 iommu/vt-d: Clear Present bit before tearing down copied context entry
CVE-2026-90244 iommu/dma: Restore locking around msi_page_list
CVE-2026-90245 fbdev: kyro: Validate overlay viewport coordinates
CVE-2026-90246 apparmor: fix integer overflow in verify_tags() bounds check
CVE-2026-90247 bpf: Fix mmap_lock leak in irq_work path
CVE-2026-90248 net/sched: cls_api: fix teardown of an adopted proto on insert-race loss
CVE-2026-90249 iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes
CVE-2026-90250 bpf, cgroup: Fix storage null-ptr-deref after replacing prog
CVE-2026-90251 Bluetooth: MSFT: validate evt_prefix_len against the response length
CVE-2026-90253 Bluetooth: MGMT: free the mesh send cancel command when it is cancelled
CVE-2026-90252 Bluetooth: MGMT: free the HCI command when it is cancelled
CVE-2026-90254 Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
CVE-2026-90256 Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90267 scsi: sd: Fix special_vec mempool leak when scsi_alloc_sgtables() fails

Showing top 20 of 602 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90242

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