CVE-2026-98282

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/powerpc/kernel/iommu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "98d8dcc4ebd10523507d4478e148809a7771a213", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "9fd9c9bbb05417f468a11fb6d145d7ff61f4a868", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "3776bf56e06980e8a12c8c0565d9e6ac44965f03", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "d6a1779129d936bc1fbab80181165da544eab736", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "d48ceb6e1a6915c7bac4f902554a1047365cdff2", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "0543813753ef5cfbd6fa96694f7acf783fa01af7", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "314091243159f8e3749bc719bb129f423f72fd86", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}, {"lessThan": "0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71", "status": "affected", "version": "b1af23d836f811137d504d14d4cbdd01929dec34", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/powerpc/kernel/iommu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.12"}, {"lessThan": "4.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\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'."}], "id": "CVE-2026-98282", "lastModified": "2026-10-19T10:18:29.667", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-10-06T09:18:18.180", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0543813753ef5cfbd6fa96694f7acf783fa01af7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/314091243159f8e3749bc719bb129f423f72fd86"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3776bf56e06980e8a12c8c0565d9e6ac44965f03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/98d8dcc4ebd10523507d4478e148809a7771a213"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9fd9c9bbb05417f468a11fb6d145d7ff61f4a868"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d48ceb6e1a6915c7bac4f902554a1047365cdff2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d6a1779129d936bc1fbab80181165da544eab736"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba", "id": "2546376", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546376"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel's PowerPC Input-Output Memory Management Unit (IOMMU) subsystem. The memory address validation logic fails to account for multi-page requests, leading to an arithmetic overflow and improper boundary verification. A local user or guest virtual machine can exploit this flaw by submitting crafted I/O requests that exceed allocated boundaries, potentially resulting in memory corruption or a denial of service (DoS) via a system crash."], "name": "CVE-2026-98282", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98282\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98282\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98282.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,98d8dcc4ebd10523507d4478e148809a7771a213)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,9fd9c9bbb05417f468a11fb6d145d7ff61f4a868)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,3776bf56e06980e8a12c8c0565d9e6ac44965f03)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,d6a1779129d936bc1fbab80181165da544eab736)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,d48ceb6e1a6915c7bac4f902554a1047365cdff2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,0543813753ef5cfbd6fa96694f7acf783fa01af7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,314091243159f8e3749bc719bb129f423f72fd86)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b1af23d836f811137d504d14d4cbdd01929dec34,0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.271,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.222,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.189,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.54,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.8,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-06T13:30:08.246780+00:00", "updated": "2026-10-11T05:30:17.277815+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}