hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer

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Summary

CVECVE-2026-64085
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:49 UTC
Updated2026-07-19 16:17:49 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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

ReferenceSourceLinkTags
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
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