{"api_version":"1","generated_at":"2026-07-20T23:53:12+00:00","cve":"CVE-2026-64083","urls":{"html":"https://cve.report/CVE-2026-64083","api":"https://cve.report/api/cve/CVE-2026-64083.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64083","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64083"},"summary":{"title":"hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] << 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return.  A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too.  If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller's\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:48","updated_at":"2026-07-19 16:17:48"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f","name":"https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142","name":"https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21","name":"https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b","name":"https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7","name":"https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac","name":"https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946","name":"https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232","name":"https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64083","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64083","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 fd9196aad9e5a3845cea17de3405ebc700382142 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 ee4799becf7d2af3778007e22c2e55c4009a49c7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 c603b6c6840ac0c6285f5eefea0de6242710af21 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 eb3cd9bb590460c6127145cb245be925d23f5232 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 64fa9328948ddcc0f7f3c23ea1756c126d9dffac git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d98dfad35c38c037b37c4adc99df01da571031a5 a7232f68c43ca62f545049b7f5fbfc75137b843b 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":"fd9196aad9e5a3845cea17de3405ebc700382142","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"ee4799becf7d2af3778007e22c2e55c4009a49c7","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"c603b6c6840ac0c6285f5eefea0de6242710af21","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"eb3cd9bb590460c6127145cb245be925d23f5232","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"64fa9328948ddcc0f7f3c23ea1756c126d9dffac","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","versionType":"git"},{"lessThan":"a7232f68c43ca62f545049b7f5fbfc75137b843b","status":"affected","version":"d98dfad35c38c037b37c4adc99df01da571031a5","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) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] << 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return.  A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too.  If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller's\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:39:54.756Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142"},{"url":"https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7"},{"url":"https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21"},{"url":"https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f"},{"url":"https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946"},{"url":"https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232"},{"url":"https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac"},{"url":"https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b"}],"title":"hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64083","datePublished":"2026-07-19T15:39:54.756Z","dateReserved":"2026-07-19T07:54:57.031Z","dateUpdated":"2026-07-19T15:39:54.756Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:48","lastModifiedDate":"2026-07-19 16:17:48","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64083","Ordinal":"1","Title":"hwmon: (pmbus/adm1266) reject short block-read responses in the ","CVE":"CVE-2026-64083","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64083","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] << 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return.  A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too.  If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller's\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls).  That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO.","Type":"Description","Title":"hwmon: (pmbus/adm1266) reject short block-read responses in the "}]}}}