kernel: i2c: stub: Reject I2C block transfers with invalid length

A flaw was found in the Linux kernel's i2c-stub driver. A local user with access to the /dev/i2c- device can exploit this vulnerability by issuing an I2C System Management Bus SMBus input/output control ioctl command with a specially crafted block transfer length. This invalid length can cause th...

i2c: stub: Reject I2C block transfers with invalid length

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SUSE CVE-2026-64191

In the Linux kernel, the following vulnerability has been resolved: i2c: stub: Reject I2C block transfers with invalid length The I2CSMBUSI2CBLOCKDATA case in stubxfer uses data-block0 as the transfer length. The existing check only clamps it to avoid overrunning the chip-words256 register array,...

CVE-2026-64191 i2c: stub: Reject I2C block transfers with invalid length

In the Linux kernel, the following vulnerability has been resolved: i2c: stub: Reject I2C block transfers with invalid length The I2CSMBUSI2CBLOCKDATA case in stubxfer uses data-block0 as the transfer length. The existing check only clamps it to avoid overrunning the chip-words256 register array,...

CVE-2026-64191

The CVE-2026-64191 issue affects the Linux kernel i2c-stub driver (CONFIG_I2C_STUB=m) where I2C_SMBUS_I2C_BLOCK_DATA did not validate data->block[0] against I2C_SMBUS_BLOCK_MAX, allowing out-of-bounds access when an I2C_SMBUS_IOCTL with a block length > 32 is issued. The bug contrasts with ...