{"api_version":"1","generated_at":"2026-09-12T03:40:14+00:00","cve":"CVE-2026-89450","urls":{"html":"https://cve.report/CVE-2026-89450","api":"https://cve.report/api/cve/CVE-2026-89450.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89450","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89450"},"summary":{"title":"iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field\n\ntegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH,\nwhose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag.\nThe HW therefore matches only a 20-bit Stream ID.\n\nThe bound check rejects only virt_sid > UINT_MAX, which admits a value far\nwider than the field. The write \"virt_sid << 1 | 0x1\" then drops every bit\nabove 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match\non vSID 0, so the entry aliases the wrong Stream ID. Because vdev->virt_id\nis guest-controlled, a VMM can trigger it.\n\nValidate virt_sid against the field width with FIELD_MAX(), and program the\nregister with FIELD_PREP() so the value and the field stay consistent.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:25","updated_at":"2026-09-11 20:19:25"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b","name":"https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c","name":"https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798","name":"https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89450","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89450","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 d903d99ffd22b0180bd745a43f221c21bcdd8d7c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 445204550f894ca325ac80a21e3df177ad073798 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 4379610c79bd88ddbea10e7f6c21e16d4b338c6b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d903d99ffd22b0180bd745a43f221c21bcdd8d7c","status":"affected","version":"4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7","versionType":"git"},{"lessThan":"445204550f894ca325ac80a21e3df177ad073798","status":"affected","version":"4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7","versionType":"git"},{"lessThan":"4379610c79bd88ddbea10e7f6c21e16d4b338c6b","status":"affected","version":"4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.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":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","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/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field\n\ntegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH,\nwhose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag.\nThe HW therefore matches only a 20-bit Stream ID.\n\nThe bound check rejects only virt_sid > UINT_MAX, which admits a value far\nwider than the field. The write \"virt_sid << 1 | 0x1\" then drops every bit\nabove 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match\non vSID 0, so the entry aliases the wrong Stream ID. Because vdev->virt_id\nis guest-controlled, a VMM can trigger it.\n\nValidate virt_sid against the field width with FIELD_MAX(), and program the\nregister with FIELD_PREP() so the value and the field stay consistent."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:16.060Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c"},{"url":"https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798"},{"url":"https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b"}],"title":"iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89450","datePublished":"2026-09-11T19:43:16.060Z","dateReserved":"2026-09-11T19:38:34.706Z","dateUpdated":"2026-09-11T19:43:16.060Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:25","lastModifiedDate":"2026-09-11 20:19:25","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89450","Ordinal":"1","Title":"iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH fie","CVE":"CVE-2026-89450","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89450","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field\n\ntegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH,\nwhose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag.\nThe HW therefore matches only a 20-bit Stream ID.\n\nThe bound check rejects only virt_sid > UINT_MAX, which admits a value far\nwider than the field. The write \"virt_sid << 1 | 0x1\" then drops every bit\nabove 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match\non vSID 0, so the entry aliases the wrong Stream ID. Because vdev->virt_id\nis guest-controlled, a VMM can trigger it.\n\nValidate virt_sid against the field width with FIELD_MAX(), and program the\nregister with FIELD_PREP() so the value and the field stay consistent.","Type":"Description","Title":"iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH fie"}]}}}