264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-98282",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-09-25T10:25:14.335Z",
|
|
"datePublished": "2026-10-06T08:45:43.775Z",
|
|
"dateUpdated": "2026-10-19T09:16:53.780Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-10-19T09:16:53.780Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba\n\nThe commit b1af23d836f8 (\"KVM: PPC: iommu: Unify TCE checking\") unified\nIOBA parameter checking across KVM and VFIO into iommu_tce_check_ioba().\nWhile doing so, the passed in argument npages is ignored and constant\nvalue '1' is used leaving out a possible overflow as the callers can\nlegitimately be using npages > 1 for H_STUFF_TCE or H_PUT_TCE_INDIRECT\ncases.\n\nFix this by accounting for 'npages', checking for arithmetic overflow,\nand verifying that the entire requested range (ioba - offset + npages)\ndoes not exceed the table capacity 'size'."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
|
|
"baseScore": 8.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - The bad ioba/npages values come from a KVM guest's H_STUFF_TCE or H_PUT_TCE_INDIRECT hypercall registers. book3s_hv.c passes them to kvmppc_h_stuff_tce()/kvmppc_h_put_tce_indirect(), which call kvmppc_ioba_validate() -> iommu_tce_check_ioba(). The attacker is code running on the host in a guest, not a remote network peer.\nAC:L - The guest picks liobn, ioba (the last valid entry) and npages itself. The flawed check only tests ioba+1, so every such hypercall reliably walks kvmppc_tce_put() past stt->size. No race or outside condition is involved; only heap grooming affects how far exploitation goes.\nPR:L - The attacker needs kernel privilege inside their own guest, which any tenant of a pseries KVM VM has. Relative to the host, that is a low-privilege tenant position. The guest's TCE table already exists because QEMU creates it through KVM_CREATE_SPAPR_TCE_64 for the default PHB/VIO DMA windows.\nUI:N - The guest issues the hypercalls whenever it wants. No action by the host administrator or any other user is needed.\nS:C - A guest-controlled hypercall corrupts host kernel memory and touches the host's hardware IOMMU table outside the guest's DMA window. The impact therefore crosses the guest-to-host virtualization boundary.\nC:H - kvmppc_tce_put() and kvmppc_h_get_tce paths index stt->pages[] past the kmalloc'd flexible array, and the TCE iommu_unmap/map paths use entries beyond the window. This gives out-of-bounds access to host heap and IOMMU state that can be turned into host memory disclosure.\nI:H - In H_STUFF_TCE, npages is unbounded and tce_value is guest-chosen. kvmppc_tce_put() writes that 8-byte value through an out-of-bounds stt->pages[] pointer, or stores a newly allocated page pointer into the out-of-bounds slot. Both are host heap writes.\nA:H - Dereferencing an out-of-bounds stt->pages[] entry as a struct page, or corrupting the host heap and IOMMU tables, crashes or oopses the host. That takes down every VM running on it."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"arch/powerpc/kernel/iommu.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "98d8dcc4ebd10523507d4478e148809a7771a213",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "9fd9c9bbb05417f468a11fb6d145d7ff61f4a868",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "3776bf56e06980e8a12c8c0565d9e6ac44965f03",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "d6a1779129d936bc1fbab80181165da544eab736",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "d48ceb6e1a6915c7bac4f902554a1047365cdff2",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "0543813753ef5cfbd6fa96694f7acf783fa01af7",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "314091243159f8e3749bc719bb129f423f72fd86",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "b1af23d836f811137d504d14d4cbdd01929dec34",
|
|
"lessThan": "0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"arch/powerpc/kernel/iommu.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "4.12",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "4.12",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.271",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.222",
|
|
"lessThanOrEqual": "5.15.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.189",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.158",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.112",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.54",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.2.8",
|
|
"lessThanOrEqual": "7.2.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.3",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"cpeApplicability": [
|
|
{
|
|
"nodes": [
|
|
{
|
|
"operator": "OR",
|
|
"negate": false,
|
|
"cpeMatch": [
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "5.10.271"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "5.15.222"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "6.1.189"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "6.6.158"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "6.12.112"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "6.18.54"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "7.2.8"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.12",
|
|
"versionEndExcluding": "7.3"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/98d8dcc4ebd10523507d4478e148809a7771a213"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/9fd9c9bbb05417f468a11fb6d145d7ff61f4a868"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/3776bf56e06980e8a12c8c0565d9e6ac44965f03"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/d6a1779129d936bc1fbab80181165da544eab736"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/d48ceb6e1a6915c7bac4f902554a1047365cdff2"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/0543813753ef5cfbd6fa96694f7acf783fa01af7"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/314091243159f8e3749bc719bb129f423f72fd86"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71"
|
|
}
|
|
],
|
|
"title": "powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
}
|
|
}
|
|
} |