{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89751", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.762Z", "datePublished": "2026-09-11T19:46:55.314Z", "dateUpdated": "2026-09-11T19:46:55.314Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:55.314Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Fix off-by-one in port I/O handling\n\nhandle_in() and handle_out() in arch/x86/coco/tdx/tdx.c use:\n\n u64 mask = GENMASK(BITS_PER_BYTE * size, 0);\n\nGENMASK(h, l) includes bit h. For size=1 (INB), this produces\nGENMASK(8, 0) = 0x1FF (9 bits) instead of GENMASK(7, 0) = 0xFF (8\nbits). The mask is one bit too wide for all I/O sizes.\n\nFix the mask calculation."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/coco/tdx/tdx.c"], "versions": [{"version": "03149948832a078f759022ed5b92e722d8d23c26", "lessThan": "222b7005e4519f633b4cd666226256abbab46a1a", "status": "affected", "versionType": "git"}, {"version": "03149948832a078f759022ed5b92e722d8d23c26", "lessThan": "c4a22154870813d10aa0b4c734a574c726f9d4b0", "status": "affected", "versionType": "git"}, {"version": "03149948832a078f759022ed5b92e722d8d23c26", "lessThan": "bb45f705c4440dd3c689328319b88dd28770bbb8", "status": "affected", "versionType": "git"}, {"version": "03149948832a078f759022ed5b92e722d8d23c26", "lessThan": "0f63e656b1c679d32ac595de29d10c03efca6a25", "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/x86/coco/tdx/tdx.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "5.19", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a"}, {"url": "https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0"}, {"url": "https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8"}, {"url": "https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25"}], "title": "x86/tdx: Fix off-by-one in port I/O handling", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/coco/tdx/tdx.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "222b7005e4519f633b4cd666226256abbab46a1a", "status": "affected", "version": "03149948832a078f759022ed5b92e722d8d23c26", "versionType": "git"}, {"lessThan": "c4a22154870813d10aa0b4c734a574c726f9d4b0", "status": "affected", "version": "03149948832a078f759022ed5b92e722d8d23c26", "versionType": "git"}, {"lessThan": "bb45f705c4440dd3c689328319b88dd28770bbb8", "status": "affected", "version": "03149948832a078f759022ed5b92e722d8d23c26", "versionType": "git"}, {"lessThan": "0f63e656b1c679d32ac595de29d10c03efca6a25", "status": "affected", "version": "03149948832a078f759022ed5b92e722d8d23c26", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/coco/tdx/tdx.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"lessThan": "5.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Fix off-by-one in port I/O handling\n\nhandle_in() and handle_out() in arch/x86/coco/tdx/tdx.c use:\n\n u64 mask = GENMASK(BITS_PER_BYTE * size, 0);\n\nGENMASK(h, l) includes bit h. For size=1 (INB), this produces\nGENMASK(8, 0) = 0x1FF (9 bits) instead of GENMASK(7, 0) = 0xFF (8\nbits). The mask is one bit too wide for all I/O sizes.\n\nFix the mask calculation."}], "id": "CVE-2026-89751", "lastModified": "2026-09-11T20:20:06.013", "metrics": {}, "published": "2026-09-11T20:20:06.013", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (x86/tdx): Off-by-one error in port I/O handling", "id": "2532152", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532152"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-193", "details": ["A flaw was found in the Linux kernel's x86/tdx component. An off-by-one error in the `handle_in()` and `handle_out()` functions, specifically in the `GENMASK` calculation for port I/O operations, causes the mask to be one bit too wide. This incorrect handling of I/O sizes could potentially lead to unintended data access or modification during port I/O operations, which may result in information disclosure or data corruption."], "name": "CVE-2026-89751", "public_date": "2026-09-11T19:46:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89751\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89751\nhttps://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25\nhttps://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a\nhttps://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8\nhttps://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0"], "threat_severity": "Moderate"}

{}