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CVE-2026-90240— iommu/vt-d: Flush context cache with correct SID when tearing down aliases

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：在拆除别名时，使用正确的 SID 刷新上下文缓存 和 这两个函数均针对设备的每一个 DMA 别名被调用一次。这两个函数都会使用 回调提供的总线/设备号（bus/devfn）来定位上下文条目，然后调用 。该函数利用 和 （即设备自身的请求者 ID）来构造一个选择性设备上下文缓存无效化操作。 因此，对于除设备自身 RID 之外的任何别名，刚在内存中清除的上下文条目并未在上下文缓存中被无效化。硬件可能会继续使用那个过时的缓存条目。在可缩放模式（scalabl

AI Predicted 7.0 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux f90584f4beb84211c4d21b319cc13f391fe9f3c2< a803141597d61dc0511f7cd849625e17d042ca8a affected
f90584f4beb84211c4d21b319cc13f391fe9f3c2< 5baddf100b3be730912485648cbaae5e3a251923 affected
f90584f4beb84211c4d21b319cc13f391fe9f3c2< c54e4ae971b98e8d650400137d332cee56c03f55 affected
6.11 affected
< 6.11 unaffected
6.18.52≤ 6.18.* unaffected
7.2.6≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-90240

Vulnerability Information
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Vulnerability Title
iommu/vt-d: Flush context cache with correct SID when tearing down aliases
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush context cache with correct SID when tearing down aliases domain_context_clear_one() and device_pasid_table_teardown() are both invoked once per DMA alias of a device. Each function locates the context entry using the bus/devfn pair provided by the pci_for_each_dma_alias() callback, then calls intel_context_flush_no_pasid(), which constructs a device-selective context-cache invalidation from info->bus and info->devfn (that is, always the requester ID of the device itself). As a result, for every alias other than the device’s own RID, the context entry that was just cleared in memory is never invalidated in the context cache. Hardware may continue using that stale cached entry. In the scalable-mode teardown path, intel_pasid_free_table() can then free the PASID directory still referenced by that stale entry, allowing the IOMMU to walk freed memory. Fix this by passing the source ID of the entry being torn down to intel_context_flush_no_pasid(), instead of deriving it from @info.
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 f90584f4beb84211c4d21b319cc13f391fe9f3c2 ~ a803141597d61dc0511f7cd849625e17d042ca8a -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-90240

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III. Intelligence Information for CVE-2026-90240

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Patches & Fixes for CVE-2026-90240 (1)

Other References for CVE-2026-90240 (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-2026-90239 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-2026-90242 iommu/vt-d: Fix iopf_refcount leak on RID domain replacement
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-2026-90240

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