CVE-2025-68760 (GCVE-0-2025-68760)
Vulnerability from cvelistv5 – Published: 2026-01-05 09:32 – Updated: 2026-05-11 21:52
VLAI
EPSS
VEX
Title
iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show
Summary
In the Linux kernel, the following vulnerability has been resolved:
iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show
In iommu_mmio_write(), it validates the user-provided offset with the
check: `iommu->dbg_mmio_offset > iommu->mmio_phys_end - 4`.
This assumes a 4-byte access. However, the corresponding
show handler, iommu_mmio_show(), uses readq() to perform an 8-byte
(64-bit) read.
If a user provides an offset equal to `mmio_phys_end - 4`, the check
passes, and will lead to a 4-byte out-of-bounds read.
Fix this by adjusting the boundary check to use sizeof(u64), which
corresponds to the size of the readq() operation.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7a4ee419e8c144b747a8915856e91a034d7c8f34 , < b959df804c33913dbfdb90750f2d693502b3d126
(git)
Affected: 7a4ee419e8c144b747a8915856e91a034d7c8f34 , < 0ec4aaf5f3f559716a6559f3d6d9616e9470bed6 (git) Affected: 7a4ee419e8c144b747a8915856e91a034d7c8f34 , < a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7 (git) |
guessed | |
| Linux | Linux |
Affected:
6.17
Unaffected: 0 , < 6.17 (semver) Unaffected: 6.17.13 , ≤ 6.17.* (semver) Unaffected: 6.18.2 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/iommu/amd/debugfs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b959df804c33913dbfdb90750f2d693502b3d126",
"status": "affected",
"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
"versionType": "git"
},
{
"lessThan": "0ec4aaf5f3f559716a6559f3d6d9616e9470bed6",
"status": "affected",
"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
"versionType": "git"
},
{
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"status": "affected",
"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/iommu/amd/debugfs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.13",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.2",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19",
"versionStartIncluding": "6.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix potential out-of-bounds read in iommu_mmio_show\n\nIn iommu_mmio_write(), it validates the user-provided offset with the\ncheck: `iommu-\u003edbg_mmio_offset \u003e iommu-\u003emmio_phys_end - 4`.\nThis assumes a 4-byte access. However, the corresponding\nshow handler, iommu_mmio_show(), uses readq() to perform an 8-byte\n(64-bit) read.\n\nIf a user provides an offset equal to `mmio_phys_end - 4`, the check\npasses, and will lead to a 4-byte out-of-bounds read.\n\nFix this by adjusting the boundary check to use sizeof(u64), which\ncorresponds to the size of the readq() operation."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:52:49.261Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126"
},
{
"url": "https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6"
},
{
"url": "https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7"
}
],
"title": "iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-68760",
"datePublished": "2026-01-05T09:32:32.894Z",
"dateReserved": "2025-12-24T10:30:51.033Z",
"dateUpdated": "2026-05-11T21:52:49.261Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-68760",
"date": "2026-10-31",
"epss": "0.00184",
"percentile": "0.08036"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/iommu/amd/debugfs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b959df804c33913dbfdb90750f2d693502b3d126",
"status": "affected",
"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
"versionType": "git"
},
{
"lessThan": "0ec4aaf5f3f559716a6559f3d6d9616e9470bed6",
"status": "affected",
"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
"versionType": "git"
},
{
"lessThan": "a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7",
"status": "affected",
"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/iommu/amd/debugfs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix potential out-of-bounds read in iommu_mmio_show\n\nIn iommu_mmio_write(), it validates the user-provided offset with the\ncheck: `iommu-\u003edbg_mmio_offset \u003e iommu-\u003emmio_phys_end - 4`.\nThis assumes a 4-byte access. However, the corresponding\nshow handler, iommu_mmio_show(), uses readq() to perform an 8-byte\n(64-bit) read.\n\nIf a user provides an offset equal to `mmio_phys_end - 4`, the check\npasses, and will lead to a 4-byte out-of-bounds read.\n\nFix this by adjusting the boundary check to use sizeof(u64), which\ncorresponds to the size of the readq() operation."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommu/amd: Corrige una posible lectura fuera de l\u00edmites en iommu_mmio_show\n\nEn iommu_mmio_write(), valida el desplazamiento proporcionado por el usuario con la comprobaci\u00f3n: \u0027iommu -\u003e dbg_mmio_offset \u003e iommu -\u003e mmio_phys_end - 4\u0027.\nEsto asume un acceso de 4 bytes. Sin embargo, el controlador de visualizaci\u00f3n correspondiente, iommu_mmio_show(), usa readq() para realizar una lectura de 8 bytes (64 bits).\n\nSi un usuario proporciona un desplazamiento igual a \u0027mmio_phys_end - 4\u0027, la comprobaci\u00f3n pasa y conducir\u00e1 a una lectura fuera de l\u00edmites de 4 bytes.\n\nSoluciona esto ajustando la comprobaci\u00f3n de l\u00edmites para usar sizeof(u64), lo que corresponde al tama\u00f1o de la operaci\u00f3n readq()."
}
],
"id": "CVE-2025-68760",
"lastModified": "2026-10-14T19:10:00.297",
"metrics": {},
"published": "2026-01-05T10:15:57.123",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-30T10:23:16+00:00",
"cve": "CVE-2025-68760",
"id": "CVE-2025-68760",
"initial_release_date": "2025-01-01T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68760.json",
"version": "3"
}
}
}
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