CVE-2026-64135
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and passes it to i2c_smbus_read_block_data() to…
Does this matter?
Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and passes it to i2c_smbus_read_block_data() to retrieve the 4-byte BLACKBOX_INFO response. i2c_smbus_read_block_data() does not honour caller buffer sizes -- it memcpy()s data.block[0] bytes from the SMBus transaction (where data.block[0] is the length byte returned by the slave device, up to I2C_SMBUS_BLOCK_MAX = 32): memcpy(values, &data.block[1], data.block[0]); If the device returns any block length above 5, the call overflows the caller's 5-byte stack buffer before the post-call if (ret != 4) return -EIO; check has a chance to reject the response. Widen the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room for any well-formed SMBus block response, matching the convention used by the other i2c_smbus_read_block_data() callers in this driver.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-674
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228Patch
- https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2aPatch
- https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188fPatch
- https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700ePatch
- https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204Patch
- https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bfPatch
- https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76Patch
- https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.