CVE-2026-64086

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64086", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.032Z", "datePublished": "2026-07-19T15:39:56.749Z", "dateUpdated": "2026-08-05T12:39:03.986Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:03.986Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer\n\nadm1266_pmbus_block_xfer() sets up the read transaction with\n\n\t.buf = data->read_buf,\n\t.len = ADM1266_PMBUS_BLOCK_MAX + 2,\n\nbut read_buf in struct adm1266_data is declared as\n\n\tu8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];\n\nFor a max-length block response (length byte = 255 + up to 1 PEC\nbyte), the i2c controller is told to write 257 bytes into a 256-byte\nbuffer, putting one byte past the end of read_buf. The same response\nalso makes the subsequent PEC compare\n\n\tif (crc != msgs[1].buf[msgs[1].buf[0] + 1])\n\nread a byte beyond the array.\n\nBump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the\nbuffer can hold the length byte, up to 255 payload bytes, and the PEC\nbyte the i2c_msg length already accounts for."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is only reached through local kernel interfaces (debugfs GPIO dump at /sys/kernel/debug/gpio and root-only nvmem blackbox reads), not through any network protocol handler. The ADM1266 sits on an on-board I2C bus on server BMC hardware.\nAC:L - An attacker who controls the I2C bus response (malicious device, compromised ADM1266 firmware, or bus interposition on the BMC) can reliably force a 255-byte block reply whenever a victim triggers the block-transfer path, causing the one-byte overflow on demand.\nPR:L - The gpio debugfs entry is world-readable (0444) if debugfs is mounted and traversable, which occurs on some embedded BMC images without strict permissions; between requiring full init-namespace root and that lower bar, the less privileged path is plausible on misconfigured systems.\nUI:N - Exploitation does not require victim interaction beyond the attacker (or a compromised daemon) programmatically reading debugfs or nvmem; no mount, click, or plug-in action by an end user is needed.\nS:U - Impact is confined to kernel memory corruption within the BMC/host kernel security boundary; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - The PEC validation performs an out-of-bounds read past read_buf, and the one-byte heap overflow can corrupt adjacent kernel objects in ways that enable further memory disclosure primitives.\nI:H - A one-byte, attacker-controlled out-of-bounds write past the end of read_buf into adjacent heap memory can corrupt slab metadata or neighboring objects and be developed into arbitrary write or code-execution primitives.\nA:H - Corrupting adjacent heap objects via the out-of-bounds write can cause kernel oops, panic, or hang on the BMC, denying management-plane availability for the managed server."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwmon/pmbus/adm1266.c"], "versions": [{"version": "407dc802a9c0809ca6a48de4b4c63305eb84ef56", "lessThan": "397d3f523bfff2f4e3dacf9b1339bd76dc207f78", "status": "affected", "versionType": "git"}, 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{}

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{"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.209", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.175", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.142", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.92", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.34", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2DF65560-A687-49D3-8FB4-E612C0BD541C", "versionEndExcluding": "5.10.258", "versionStartIncluding": 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following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer\n\nadm1266_pmbus_block_xfer() sets up the read transaction with\n\n\t.buf = data->read_buf,\n\t.len = ADM1266_PMBUS_BLOCK_MAX + 2,\n\nbut read_buf in struct adm1266_data is declared as\n\n\tu8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];\n\nFor a max-length block response (length byte = 255 + up to 1 PEC\nbyte), the i2c controller is told to write 257 bytes into a 256-byte\nbuffer, putting one byte past the end of read_buf. The same response\nalso makes the subsequent PEC compare\n\n\tif (crc != msgs[1].buf[msgs[1].buf[0] + 1])\n\nread a byte beyond the array.\n\nBump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the\nbuffer can hold the length byte, up to 255 payload bytes, and the PEC\nbyte the i2c_msg length already accounts for."}], "id": "CVE-2026-64086", "lastModified": "2026-09-03T16:12:53.580", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:49.300", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2279c342d94eca225bf9f301c8806a05a1c81619"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/397d3f523bfff2f4e3dacf9b1339bd76dc207f78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/472744f69d25a2d5111ad62f1d62579dce2c13c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/487566cb1ccdf3756fdd7bf8d875e612ff3169bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/528a9f88e88502d0c2f2052a279415074cd83715"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6c802145a8de0830bca803c6d415f7e9e683624"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d94ceb16e55b6d8019ab069e357c76ac42f0ffbc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer", "id": "2502561", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502561"}, "csaw": false, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nhwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer\nadm1266_pmbus_block_xfer() sets up the read transaction with\n.buf = data->read_buf,\n.len = ADM1266_PMBUS_BLOCK_MAX + 2,\nbut read_buf in struct adm1266_data is declared as\nu8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];\nFor a max-length block response (length byte = 255 + up to 1 PEC\nbyte), the i2c controller is told to write 257 bytes into a 256-byte\nbuffer, putting one byte past the end of read_buf. The same response\nalso makes the subsequent PEC compare\nif (crc != msgs[1].buf[msgs[1].buf[0] + 1])\nread a byte beyond the array.\nBump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the\nbuffer can hold the length byte, up to 255 payload bytes, and the PEC\nbyte the i2c_msg length already accounts for.", "A flaw was found in the Linux kernel's hwmon (hardware monitoring) subsystem, specifically in the pmbus/adm1266 driver. The `adm1266_pmbus_block_xfer()` function attempts to read one byte more than the allocated buffer size during a block transfer read operation. This out-of-bounds write can lead to memory corruption and potentially an information disclosure or denial of service."], "name": "CVE-2026-64086", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "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-2026-64086\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64086\nhttps://lore.kernel.org/linux-cve-announce/2026071916-CVE-2026-64086-fb53@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,397d3f523bfff2f4e3dacf9b1339bd76dc207f78)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,472744f69d25a2d5111ad62f1d62579dce2c13c8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,528a9f88e88502d0c2f2052a279415074cd83715)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,d94ceb16e55b6d8019ab069e357c76ac42f0ffbc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,2279c342d94eca225bf9f301c8806a05a1c81619)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,a6c802145a8de0830bca803c6d415f7e9e683624)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[407dc802a9c0809ca6a48de4b4c63305eb84ef56,487566cb1ccdf3756fdd7bf8d875e612ff3169bb)"}}], "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": "semver", "value": "5.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.258,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.142,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.92,6.13.0)"}}, {"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": "2026-07-21T11:45:03.655096+00:00", "updated": "2026-09-03T23:00:11.687551+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}