hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
Summary
| CVE | CVE-2026-64085 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-19 16:17:49 UTC |
| Updated | 2026-07-30 14:59:47 UTC |
| 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. |
Risk And Classification
EPSS: 0.001840000 probability, percentile 0.082950000 (date 2026-08-02)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 7896d87cbb05e097efc113243d4e38f9f8cea16c git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 9d5309500b4607b7198e19f0a3fa13eb864cd5fb git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 6098634cfa711f11a8d65368dc51ec8f7c8241ba git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 60c4b9fe1a3dd012014b1f561a6928a0b5db1126 git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 83e039f0a43e0708515b0479cb7690fb93faaaa0 git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 dd47b8c4a0a8ced442da3f008db28fbbd31feaf0 git | Not specified |
| CNA | Linux | Linux | affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 43cae21424ff8e33894a0f86c6b80b840c049fd7 git | Not specified |
| CNA | Linux | Linux | affected 5.10 | Not specified |
| CNA | Linux | Linux | unaffected 5.10 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.258 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.209 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.175 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.142 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.92 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.34 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.11 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.