CVE-2026-90332

CVE CVE-2026-90332EUVD EUVD-2026-81993Published 2026-09-17T16:08:46.000ZLast changed 2026-09-18T17:54:42.000ZCVSS 8.2

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: PCI: dwc: ep: Flush cached MSI write before unmapping the iATU The MSI-X path already flushes any posted MSI-X write before tearing down its iATU mapping. That was added by commit c22533c66cca ("PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry") to make sure the write reaches the Root Complex before the outbound window that translates it disappears. The MSI path has the same problem but no equivalent flush. When the Endpoint driver caches an MSI target address and later observes that the Root Complex has changed it, dw_pcie_ep_raise_msi_irq() unmaps the existing iATU entry and reprograms it for the new address. Between the last MSI writel() and the unmap there may still be a posted write sitting in the fabric, and unmapping the iATU entry can drop or misroute that write. Fix this by reading back from the mapped MSI window before the unmap. The readback drains any posted MSI writes through the same iATU entry that mapped them, which is the same logic the MSI-X path uses. [mani: commit log]

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 468711a40d5dfc01bf0a24c1981246a2c93ac405 <1b01d725d8b42450b86a857bab3c46856c740166; patch: 0; 468711a40d5dfc01bf0a24c1981246a2c93ac405 <914704c7b318bdaa42dce4e55f6c492190fee3b5; cc83cd7b7d73d42ee64c7fc08ce679957df0f315; patch: 7.2.6; 7.0; patch: 7.3-rc1; 6.19.7 <6.20

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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