{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64186", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.039Z", "datePublished": "2026-07-19T15:41:08.054Z", "dateUpdated": "2026-07-19T15:41:08.054Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:41:08.054Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Remove latent out-of-bounds access in IOMMU debugfs\n\nIn iommu_mmio_write() and iommu_capability_write(), the variables\ndbg_mmio_offset and dbg_cap_offset are declared as int. However, they\nare populated using kstrtou32_from_user(). If a user provides a\nsufficiently large value, it can become a negative integer.\n\nPrior to this patch, the AMD IOMMU debugfs implementation was already\nprotected by different mechanisms.\n\n1. #define OFS_IN_SZ 8 ensures the user string <= 8 bytes, so\n e.g. 0xffffffff isn't a valid input.\n\n if (cnt > OFS_IN_SZ)\n return -EINVAL;\n\n2. Implicit type promotion in iommu_mmio_write(), dbg_mmio_offset is int\n and iommu->mmio_phys_end is u64\n\n if (dbg_mmio_offset > iommu->mmio_phys_end - sizeof(u64))\n return -EINVAL;\n\n3. The show handlers would currently catch the negative number and\n refuse to perform the read.\n\nReplace kstrtou32_from_user() with kstrtos32_from_user() to parse the\ninput, and check for negative values to explicitly prevent out-of-bounds\nmemory accesses directly in iommu_mmio_write() and\niommu_capability_write()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/amd/debugfs.c"], "versions": [{"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34", "lessThan": "488d2c76bd9f78433a70690d1054bfae3d39a407", "status": "affected", "versionType": "git"}, {"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34", "lessThan": "62f9dfbf1aceae88b03c5ca08f7d36e943939dec", "status": "affected", "versionType": "git"}, {"version": "7a4ee419e8c144b747a8915856e91a034d7c8f34", "lessThan": "8dfd3d8d74435344ee8dc9237596959c8b2a6cbe", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/amd/debugfs.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.17", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/488d2c76bd9f78433a70690d1054bfae3d39a407"}, {"url": "https://git.kernel.org/stable/c/62f9dfbf1aceae88b03c5ca08f7d36e943939dec"}, {"url": "https://git.kernel.org/stable/c/8dfd3d8d74435344ee8dc9237596959c8b2a6cbe"}], "title": "iommu/amd: Remove latent out-of-bounds access in IOMMU debugfs", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: iommu/amd: Remove latent out-of-bounds access in IOMMU debugfs", "id": "2502514", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502514"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niommu/amd: Remove latent out-of-bounds access in IOMMU debugfs\nIn iommu_mmio_write() and iommu_capability_write(), the variables\ndbg_mmio_offset and dbg_cap_offset are declared as int. However, they\nare populated using kstrtou32_from_user(). If a user provides a\nsufficiently large value, it can become a negative integer.\nPrior to this patch, the AMD IOMMU debugfs implementation was already\nprotected by different mechanisms.\n1. #define OFS_IN_SZ 8 ensures the user string <= 8 bytes, so\ne.g. 0xffffffff isn't a valid input.\nif (cnt > OFS_IN_SZ)\nreturn -EINVAL;\n2. Implicit type promotion in iommu_mmio_write(), dbg_mmio_offset is int\nand iommu->mmio_phys_end is u64\nif (dbg_mmio_offset > iommu->mmio_phys_end - sizeof(u64))\nreturn -EINVAL;\n3. The show handlers would currently catch the negative number and\nrefuse to perform the read.\nReplace kstrtou32_from_user() with kstrtos32_from_user() to parse the\ninput, and check for negative values to explicitly prevent out-of-bounds\nmemory accesses directly in iommu_mmio_write() and\niommu_capability_write().", "A flaw was found in the Linux kernel's AMD IOMMU debugfs. Improper handling of user-provided input in the `iommu_mmio_write()` and `iommu_capability_write()` functions can lead to an out-of-bounds memory access. This vulnerability could allow a local attacker to potentially cause a denial of service or information disclosure by providing a specially crafted input."], "name": "CVE-2026-64186", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64186\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64186\nhttps://lore.kernel.org/linux-cve-announce/2026071939-CVE-2026-64186-7a61@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7a4ee419e8c144b747a8915856e91a034d7c8f34,488d2c76bd9f78433a70690d1054bfae3d39a407)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7a4ee419e8c144b747a8915856e91a034d7c8f34,62f9dfbf1aceae88b03c5ca08f7d36e943939dec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7a4ee419e8c144b747a8915856e91a034d7c8f34,8dfd3d8d74435344ee8dc9237596959c8b2a6cbe)"}}], "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": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-07-21T19:45:03.097516+00:00", "updated": "2026-07-24T23:45:07.296214+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}