CVE-2026-80620 - Vulnerability Details

- Revert "PCI/MSI: Unmap MSI-X region on error"

Description

In the Linux kernel, the following vulnerability has been resolved:

Revert "PCI/MSI: Unmap MSI-X region on error"

This reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202.

Commit 1a8d4c6ecb4c ("PCI/MSI: Unmap MSI-X region on error") added an
iounmap(dev->msix_base) on the error path of msix_capability_init() to
release the MSI-X region when msix_setup_interrupts() fails.

When msix_setup_interrupts() fails, the call chain is:

msix_setup_interrupts()
-> __msix_setup_interrupts()
struct pci_dev *dev __free(free_msi_irqs) = __dev;
...
return ret; // __free cleanup fires on error

The __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which
already handles the unmap:

void pci_free_msi_irqs(struct pci_dev *dev)
{
pci_msi_teardown_msi_irqs(dev);
if (dev->msix_base) {
iounmap(dev->msix_base); // already unmapped here
dev->msix_base = NULL; // and set to NULL
}
}

So dev->msix_base is unmapped and set to NULL before
msix_setup_interrupts() returns to msix_capability_init(). The
"goto out_unmap" introduced by commit 1a8d4c6ecb4c ("PCI/MSI: Unmap
MSI-X region on error") then calls iounmap() a second time on a NULL
pointer.

This was reproduced on Intel Emerald Rapids (192 CPUs) while
running tools/testing/selftests/kexec/test_kexec_jump.sh:

WARNING: CPU#44 at iounmap+0x2a/0xe0
RIP: 0010:iounmap+0x2a/0xe0
RDI: 0000000000000000
Call Trace:
msix_capability_init+0x317/0x3f0
__pci_enable_msix_range+0x21d/0x2c0
pci_alloc_irq_vectors_affinity+0xa9/0x130
nvme_setup_io_queues+0x2a8/0x420 [nvme]
nvme_reset_work+0x151/0x340 [nvme]
...

RDI=0 confirms iounmap() is called with NULL.

Restore the original "goto out_disable" and leave the unmap to the
existing __free(free_msi_irqs) cleanup.

Published: 2026-08-28

Score: n/a

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`4a7589b615a3db6792d36b874add86cd22188c95`	affected	< 82e120a7dd566c476ba923d30e3fb78e8118a1dd
`5f007c6acaa7d9a543b492c1e48c48a0ea1d7147`	affected	< 6848ca381edff84f87dd1b6973848c271541e813
`76f7abd4ee0188f06465bdd3c053fdc5e8595152`	affected	< 0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f
`aee8db5f048616990dbdefcc25689ade0a2620ec`	affected	< f79519f636059b007d6abc91652f36dea4f54a20
`1a8d4c6ecb4c81261bcdf13556abd4a958eca202`	affected	< 3691a82be2095abaf3326a1cbf7b25858a1d959c
`1a8d4c6ecb4c81261bcdf13556abd4a958eca202`	affected	< f64e03da0d83cb173743888bff4a7e61476a8fc2
`19bf27b450fcd5309bacd614b12bd7de1ac6535b`	affected	—
`6.1.165`	affected	< 6.1.178
`6.6.128`	affected	< 6.6.145
`6.12.75`	affected	< 6.12.97
`6.18.16`	affected	< 6.18.40
`6.19.6`	affected	< 6.20

Linux

affected

Version	Status	Constraints
`7.0`	affected	—
`0`	unaffected	< 7.0
`6.1.178`	unaffected	≤ 6.1.*
`6.6.145`	unaffected	≤ 6.6.*
`6.12.97`	unaffected	≤ 6.12.*
`6.18.40`	unaffected	≤ 6.18.*
`7.1.5`	unaffected	≤ 7.1.*
`7.2`	unaffected	≤ *

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f
https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c
https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813
https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd
https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2
https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20

History

Fri, 28 Aug 2026 07:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: Revert "PCI/MSI: Unmap MSI-X region on error" This reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202. Commit 1a8d4c6ecb4c ("PCI/MSI: Unmap MSI-X region on error") added an iounmap(dev->msix_base) on the error path of msix_capability_init() to release the MSI-X region when msix_setup_interrupts() fails. When msix_setup_interrupts() fails, the call chain is: msix_setup_interrupts() -> __msix_setup_interrupts() struct pci_dev dev __free(free_msi_irqs) = __dev; ... return ret; // __free cleanup fires on error The __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which already handles the unmap: void pci_free_msi_irqs(struct pci_dev dev) { pci_msi_teardown_msi_irqs(dev); if (dev->msix_base) { iounmap(dev->msix_base); // already unmapped here dev->msix_base = NULL; // and set to NULL } } So dev->msix_base is unmapped and set to NULL before msix_setup_interrupts() returns to msix_capability_init(). The "goto out_unmap" introduced by commit 1a8d4c6ecb4c ("PCI/MSI: Unmap MSI-X region on error") then calls iounmap() a second time on a NULL pointer. This was reproduced on Intel Emerald Rapids (192 CPUs) while running tools/testing/selftests/kexec/test_kexec_jump.sh: WARNING: CPU#44 at iounmap+0x2a/0xe0 RIP: 0010:iounmap+0x2a/0xe0 RDI: 0000000000000000 Call Trace: msix_capability_init+0x317/0x3f0 __pci_enable_msix_range+0x21d/0x2c0 pci_alloc_irq_vectors_affinity+0xa9/0x130 nvme_setup_io_queues+0x2a8/0x420 [nvme] nvme_reset_work+0x151/0x340 [nvme] ... RDI=0 confirms iounmap() is called with NULL. Restore the original "goto out_disable" and leave the unmap to the existing __free(free_msi_irqs) cleanup.
Title		Revert "PCI/MSI: Unmap MSI-X region on error"
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813 https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2 https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20

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Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-28T06:48:40.340Z

Updated: 2026-08-28T06:48:40.340Z

Reserved: 2026-08-26T14:34:25.774Z

Link: CVE-2026-80620

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-08-28T08:16:46.083

Modified: 2026-08-28T08:16:46.083

Link: CVE-2026-80620

Redhat

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OpenCVE Enrichment

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Weaknesses

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Tracking

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