PCI: dwc: ep: Flush cached MSI write before unmapping the iATU
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]
CVE-2026-90332
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90332
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "468711a40d5dfc01bf0a24c1981246a2c93ac405",
"lessThan": "914704c7b318bdaa42dce4e55f6c492190fee3b5",
"versionType": "git"
},
{
"status": "affected",
"version": "468711a40d5dfc01bf0a24c1981246a2c93ac405",
"lessThan": "1b01d725d8b42450b86a857bab3c46856c740166",
"versionType": "git"
},
{
"status": "affected",
"version": "cc83cd7b7d73d42ee64c7fc08ce679957df0f315",
"versionType": "git"
},
{
"status": "affected",
"version": "6.19.7",
"lessThan": "6.20",
"versionType": "semver"
}
],
"programFiles": [
"drivers/pci/controller/dwc/pcie-designware-ep.c",
"drivers/pci/controller/dwc/pcie-designware.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/pci/controller/dwc/pcie-designware-ep.c",
"drivers/pci/controller/dwc/pcie-designware.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90332
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36676 · Revision 1
- Added to Heist Feed
- Publisher date