{"id":"CVE-2026-64135","state":"PUBLISHED","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.","publishedAt":"2026-07-19T15:40:29.676Z","updatedAt":"2026-07-19T15:40:29.676Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"33251abb9c9dd62943be76f0427c5527ee39188f","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"ba09f4baa5bd96c5d26c942defa546a72dbbe5bf","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"0dbf64c502443c08c2e28a77ecbfcc5479d93228","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"2b7a698d5093b548c464828d984f05ced5f3fd2a","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"ca560f7566df7e2826c2999e959e6b94eb938f76","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"7f705e581ef3e6bb308a121a89adf5237d968204","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"eee213daa1e1b402eb631bcd1b8c5aa340a6b081","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/pmbus/adm1266.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.142","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/pmbus/adm1266.c"]}],"references":["https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f","https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf","https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e","https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228","https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a","https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76","https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204","https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64135.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64135","state":"PUBLISHED","datePublished":"2026-07-19T15:40:29.676Z","dateUpdated":"2026-07-19T15:40:29.676Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.036Z"},"containers":{"cna":{"title":"hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"33251abb9c9dd62943be76f0427c5527ee39188f","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"ba09f4baa5bd96c5d26c942defa546a72dbbe5bf","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"0dbf64c502443c08c2e28a77ecbfcc5479d93228","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"2b7a698d5093b548c464828d984f05ced5f3fd2a","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"ca560f7566df7e2826c2999e959e6b94eb938f76","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"7f705e581ef3e6bb308a121a89adf5237d968204","versionType":"git"},{"version":"15609d1893020436e1e8ccfd9ded774a96dd17a2","status":"affected","lessThan":"eee213daa1e1b402eb631bcd1b8c5aa340a6b081","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/pmbus/adm1266.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.142","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/pmbus/adm1266.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T15:40:29.676Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}