CVE-2026-64085
hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer adm1266_pmbus_block_xfer() copies the device-supplied block payload into the caller-provided buffer using the device-supplied length: memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); The helper does not know how large data_r is and trusts the device to return at most one record's worth of bytes. adm1266_nvmem_read_blackbox() violates that contract: it advances read_buff inside data->dev_mem in ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns more than 64 bytes on the trailing record (read_buff offset 1984 in the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes before the post-call if (ret != ADM1266_BLACKBOX_SIZE) return -EIO; can reject the response. Contain the fix in the caller without changing the helper signature: read each record into a 255-byte local bounce buffer that matches the helper's maximum output, validate the returned length, and only then copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 19, 2026, 4:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64085
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Use a local bounce buffer matching helper's max output.
- Validate the returned data length.
- Copy only the required amount into the destination buffer.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64085.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64085 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64085
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64085 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64085 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '7896d87cbb05e097efc113243d4e38f9f8cea16c', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '9d5309500b4607b7198e19f0a3fa13eb864cd5fb', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '6098634cfa711f11a8d65368dc51ec8f7c8241ba', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '60c4b9fe1a3dd012014b1f561a6928a0b5db1126', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '83e039f0a43e0708515b0479cb7690fb93faaaa0', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': 'dd47b8c4a0a8ced442da3f008db28fbbd31feaf0', 'versionType': 'git'}, {'status': 'affected', 'version': '407dc802a9c0809ca6a48de4b4c63305eb84ef56', 'lessThan': '43cae21424ff8e33894a0f86c6b80b840c049fd7', 'versionType': 'git'}], 'programFiles': ['drivers/hwmon/pmbus/adm1266.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/hwmon/pmbus/adm1266.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer adm1266_pmbus_block_xfer() copies the device-supplied block payload into the caller-provided buffer using the device-supplied length: memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); The helper does not know how large data_r is and trusts the device to return at most one record's worth of bytes. adm1266_nvmem_read_blackbox() violates that contract: it advances read_buff inside data->dev_mem in ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns more than 64 bytes on the trailing record (read_buff offset 1984 in the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes before the post-call if (ret != ADM1266_BLACKBOX_SIZE) return -EIO; can reject the response. Contain the fix in the caller without changing the helper signature: read each record into a 255-byte local bounce buffer that matches the helper's maximum output, validate the returned length, and only then copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot. Added Reference https://git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7 Added Reference https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba Added Reference https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126 Added Reference https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c Added Reference https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0 Added Reference https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f Added Reference https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb Added Reference https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0