CVE-2026-80620
Estado: RecibidaSin puntuar—
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:
The __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which already handles the unmap:
So dev->msix_base is unmapped and set to NULL before msix_setup_interrupts() returns to msix_capability_init().
Leer descripción completaMostrar menos
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:
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.
Detalles técnicos trazas, registros y código del informe original
msix_setup_interrupts()
-> __msix_setup_interrupts()
struct pci_dev *dev __free(free_msi_irqs) = __dev;
...
return ret; // __free cleanup fires on error
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
}
}
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]
...CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- 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
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80620",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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{
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{
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{
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],
"programFiles": [
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],
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},
{
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"vendor": "Linux",
"product": "Linux",
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},
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},
{
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}
],
"programFiles": [
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],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-28T08:16:46.083",
"references": [
{
"url": "https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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},
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"PCI/MSI: Unmap MSI-X region on error\"\n\nThis reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202.\n\nCommit 1a8d4c6ecb4c (\"PCI/MSI: Unmap MSI-X region on error\") added an\niounmap(dev->msix_base) on the error path of msix_capability_init() to\nrelease the MSI-X region when msix_setup_interrupts() fails.\n\nWhen msix_setup_interrupts() fails, the call chain is:\n\n msix_setup_interrupts()\n -> __msix_setup_interrupts()\n struct pci_dev *dev __free(free_msi_irqs) = __dev;\n ...\n return ret; // __free cleanup fires on error\n\nThe __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which\nalready handles the unmap:\n\n void pci_free_msi_irqs(struct pci_dev *dev)\n {\n pci_msi_teardown_msi_irqs(dev);\n if (dev->msix_base) {\n iounmap(dev->msix_base); // already unmapped here\n dev->msix_base = NULL; // and set to NULL\n }\n }\n\nSo dev->msix_base is unmapped and set to NULL before\nmsix_setup_interrupts() returns to msix_capability_init(). The\n\"goto out_unmap\" introduced by commit 1a8d4c6ecb4c (\"PCI/MSI: Unmap\nMSI-X region on error\") then calls iounmap() a second time on a NULL\npointer.\n\nThis was reproduced on Intel Emerald Rapids (192 CPUs) while\nrunning tools/testing/selftests/kexec/test_kexec_jump.sh:\n\n WARNING: CPU#44 at iounmap+0x2a/0xe0\n RIP: 0010:iounmap+0x2a/0xe0\n RDI: 0000000000000000\n Call Trace:\n msix_capability_init+0x317/0x3f0\n __pci_enable_msix_range+0x21d/0x2c0\n pci_alloc_irq_vectors_affinity+0xa9/0x130\n nvme_setup_io_queues+0x2a8/0x420 [nvme]\n nvme_reset_work+0x151/0x340 [nvme]\n ...\n\nRDI=0 confirms iounmap() is called with NULL.\n\nRestore the original \"goto out_disable\" and leave the unmap to the\nexisting __free(free_msi_irqs) cleanup."
}
],
"lastModified": "2026-08-28T08:16:46.083",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}