{"api_version":"1","generated_at":"2026-07-20T14:43:36+00:00","cve":"CVE-2026-64135","urls":{"html":"https://cve.report/CVE-2026-64135","api":"https://cve.report/api/cve/CVE-2026-64135.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64135","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64135"},"summary":{"title":"hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX\n\nadm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and\npasses it to i2c_smbus_read_block_data() to retrieve the 4-byte\nBLACKBOX_INFO response.  i2c_smbus_read_block_data() does not honour\ncaller buffer sizes -- it memcpy()s data.block[0] bytes from the\nSMBus transaction (where data.block[0] is the length byte returned by\nthe slave device, up to I2C_SMBUS_BLOCK_MAX = 32):\n\n\tmemcpy(values, &data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller's 5-byte stack buffer before the post-call\n\n\tif (ret != 4)\n\t\treturn -EIO;\n\ncheck has a chance to reject the response.\n\nWiden the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room\nfor any well-formed SMBus block response, matching the convention used\nby the other i2c_smbus_read_block_data() callers in this driver.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:55","updated_at":"2026-07-19 16:17:55"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204","name":"https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a","name":"https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228","name":"https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081","name":"https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf","name":"https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e","name":"https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f","name":"https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76","name":"https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64135","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64135","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 33251abb9c9dd62943be76f0427c5527ee39188f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 ba09f4baa5bd96c5d26c942defa546a72dbbe5bf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 0dbf64c502443c08c2e28a77ecbfcc5479d93228 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 2b7a698d5093b548c464828d984f05ced5f3fd2a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 ca560f7566df7e2826c2999e959e6b94eb938f76 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 7f705e581ef3e6bb308a121a89adf5237d968204 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 eee213daa1e1b402eb631bcd1b8c5aa340a6b081 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.258 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.142 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.92 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * 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/hwmon/pmbus/adm1266.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"33251abb9c9dd62943be76f0427c5527ee39188f","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"ba09f4baa5bd96c5d26c942defa546a72dbbe5bf","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"0dbf64c502443c08c2e28a77ecbfcc5479d93228","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"2b7a698d5093b548c464828d984f05ced5f3fd2a","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"ca560f7566df7e2826c2999e959e6b94eb938f76","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"7f705e581ef3e6bb308a121a89adf5237d968204","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"},{"lessThan":"eee213daa1e1b402eb631bcd1b8c5aa340a6b081","status":"affected","version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/pmbus/adm1266.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.10"},{"lessThan":"5.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.142","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.92","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX\n\nadm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and\npasses it to i2c_smbus_read_block_data() to retrieve the 4-byte\nBLACKBOX_INFO response.  i2c_smbus_read_block_data() does not honour\ncaller buffer sizes -- it memcpy()s data.block[0] bytes from the\nSMBus transaction (where data.block[0] is the length byte returned by\nthe slave device, up to I2C_SMBUS_BLOCK_MAX = 32):\n\n\tmemcpy(values, &data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller's 5-byte stack buffer before the post-call\n\n\tif (ret != 4)\n\t\treturn -EIO;\n\ncheck has a chance to reject the response.\n\nWiden the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room\nfor any well-formed SMBus block response, matching the convention used\nby the other i2c_smbus_read_block_data() callers in this driver."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:29.676Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f"},{"url":"https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf"},{"url":"https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e"},{"url":"https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228"},{"url":"https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a"},{"url":"https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76"},{"url":"https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204"},{"url":"https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081"}],"title":"hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64135","datePublished":"2026-07-19T15:40:29.676Z","dateReserved":"2026-07-19T07:54:57.036Z","dateUpdated":"2026-07-19T15:40:29.676Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:55","lastModifiedDate":"2026-07-19 16:17:55","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64135","Ordinal":"1","Title":"hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_B","CVE":"CVE-2026-64135","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64135","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX\n\nadm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and\npasses it to i2c_smbus_read_block_data() to retrieve the 4-byte\nBLACKBOX_INFO response.  i2c_smbus_read_block_data() does not honour\ncaller buffer sizes -- it memcpy()s data.block[0] bytes from the\nSMBus transaction (where data.block[0] is the length byte returned by\nthe slave device, up to I2C_SMBUS_BLOCK_MAX = 32):\n\n\tmemcpy(values, &data.block[1], data.block[0]);\n\nIf the device returns any block length above 5, the call overflows\nthe caller's 5-byte stack buffer before the post-call\n\n\tif (ret != 4)\n\t\treturn -EIO;\n\ncheck has a chance to reject the response.\n\nWiden the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room\nfor any well-formed SMBus block response, matching the convention used\nby the other i2c_smbus_read_block_data() callers in this driver.","Type":"Description","Title":"hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_B"}]}}}