CVE-2026-46141
Estado: En análisisMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
powerpc/xive: fix kmemleak caused by incorrect chip_data lookup
The kmemleak reports the following memory leak:
This occurs when allocating MSI-X vectors for an NVMe device. During allocation the XIVE code creates a struct xive_irq_data and stores it in irq_data->chip_data.
When the MSI-X irqdomain is later freed, xive_irq_free_data() is responsible for retrieving this structure and freeing it. However, after commit cc0cc23babc9 ("powerpc/xive: Untangle xive from child interrupt controller drivers"), xive_irq_free_data() retrieves the chip_data using irq_get_chip_data(), which looks up the data through the child domain.
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This is incorrect because the XIVE-specific irq data is associated with the XIVE (parent) domain. As a result the lookup fails and the allocated struct xive_irq_data is never freed, leading to the kmemleak report shown above.
Fix this by retrieving the irq_data from the correct domain using irq_domain_get_irq_data() and then accessing the chip_data via irq_data_get_irq_chip_data().
Detalles técnicos trazas, registros y código del informe original
Unreferenced object 0xc0000002a7fbc640 (size 64):
comm "kworker/8:1", pid 540, jiffies 4294937872
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 09 04 00 04 00 00 ................
00 00 a7 81 00 00 0a c0 00 00 08 04 00 04 00 00 ................
backtrace (crc 177d48f6):
__kmalloc_cache_noprof+0x520/0x730
xive_irq_alloc_data.constprop.0+0x40/0xe0
xive_irq_domain_alloc+0xd0/0x1b0
irq_domain_alloc_irqs_parent+0x44/0x6c
pseries_irq_domain_alloc+0x1cc/0x354
irq_domain_alloc_irqs_parent+0x44/0x6c
msi_domain_alloc+0xb0/0x220
irq_domain_alloc_irqs_locked+0x138/0x4d0
__irq_domain_alloc_irqs+0x8c/0xfc
__msi_domain_alloc_irqs+0x214/0x4d8
msi_domain_alloc_irqs_all_locked+0x70/0xf8
pci_msi_setup_msi_irqs+0x60/0x78
__pci_enable_msix_range+0x54c/0x98c
pci_alloc_irq_vectors_affinity+0x16c/0x1d4
nvme_pci_enable+0xac/0x9c0 [nvme]
nvme_probe+0x340/0x764 [nvme]CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 5/10/2026
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)
CWE
- CWE-401
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-46141",
"cveTags": [],
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"type": "Primary",
"source": "nvd@nist.gov",
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"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
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"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
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"programFiles": [
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],
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},
{
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"vendor": "Linux",
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{
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"version": "0",
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{
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"version": "6.18.30",
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],
"published": "2026-05-28T10:16:29.680",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-401"
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}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/xive: fix kmemleak caused by incorrect chip_data lookup\n\nThe kmemleak reports the following memory leak:\n\nUnreferenced object 0xc0000002a7fbc640 (size 64):\n comm \"kworker/8:1\", pid 540, jiffies 4294937872\n hex dump (first 32 bytes):\n 01 00 00 00 00 00 00 00 00 00 09 04 00 04 00 00 ................\n 00 00 a7 81 00 00 0a c0 00 00 08 04 00 04 00 00 ................\n backtrace (crc 177d48f6):\n __kmalloc_cache_noprof+0x520/0x730\n xive_irq_alloc_data.constprop.0+0x40/0xe0\n xive_irq_domain_alloc+0xd0/0x1b0\n irq_domain_alloc_irqs_parent+0x44/0x6c\n pseries_irq_domain_alloc+0x1cc/0x354\n irq_domain_alloc_irqs_parent+0x44/0x6c\n msi_domain_alloc+0xb0/0x220\n irq_domain_alloc_irqs_locked+0x138/0x4d0\n __irq_domain_alloc_irqs+0x8c/0xfc\n __msi_domain_alloc_irqs+0x214/0x4d8\n msi_domain_alloc_irqs_all_locked+0x70/0xf8\n pci_msi_setup_msi_irqs+0x60/0x78\n __pci_enable_msix_range+0x54c/0x98c\n pci_alloc_irq_vectors_affinity+0x16c/0x1d4\n nvme_pci_enable+0xac/0x9c0 [nvme]\n nvme_probe+0x340/0x764 [nvme]\n\nThis occurs when allocating MSI-X vectors for an NVMe device. During\nallocation the XIVE code creates a struct xive_irq_data and stores it\nin irq_data->chip_data.\n\nWhen the MSI-X irqdomain is later freed, xive_irq_free_data() is\nresponsible for retrieving this structure and freeing it. However,\nafter commit cc0cc23babc9 (\"powerpc/xive: Untangle xive from child\ninterrupt controller drivers\"), xive_irq_free_data() retrieves the\nchip_data using irq_get_chip_data(), which looks up the data through\nthe child domain.\n\nThis is incorrect because the XIVE-specific irq data is associated with\nthe XIVE (parent) domain. As a result the lookup fails and the allocated\nstruct xive_irq_data is never freed, leading to the kmemleak report\nshown above.\n\nFix this by retrieving the irq_data from the correct domain using\nirq_domain_get_irq_data() and then accessing the chip_data via\nirq_data_get_irq_chip_data()."
}
],
"lastModified": "2026-06-24T17:08:28.837",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9EB9FADE-E22F-41C2-9790-4F5564D59E62",
"versionEndExcluding": "6.18.30",
"versionStartIncluding": "6.18"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E",
"versionEndExcluding": "7.0.7",
"versionStartIncluding": "6.19"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}