In the Linux kernel, the following vulnerability has been resolved:
i2c: ismt: Fix an out-of-bounds bug in ismt_access()
When the driver does not check the data from the user, the variable 'data->block[0]' may be very large to cause an out-of-bounds bug.
The following log can reveal it:
[ 33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20 [ 33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA: WRITE [ 33.996475] ================================================================== [ 33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b [ 33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485 [ 33.999450] Call Trace: [ 34.001849] memcpy+0x20/0x60 [ 34.002077] ismt_access.cold+0x374/0x214b [ 34.003382] __i2c_smbus_xfer+0x44f/0xfb0 [ 34.004007] i2c_smbus_xfer+0x10a/0x390 [ 34.004291] i2cdev_ioctl_smbus+0x2c8/0x710 [ 34.005196] i2cdev_ioctl+0x5ec/0x74c
Fix this bug by checking the size of 'data->block[0]' first.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Sep 22, 2025 | Sep 22, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perf | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 18, 2025 |
| Ubuntu | — | Upgrade linux-gcp-5.15Upgrade linux-gcpUpgrade linux-riscv-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-aws-5.15Upgrade linux-azure-4.15Upgrade linux-realtimeUpgrade linux-gcp-fipsUpgrade linux-raspi-5.4Upgrade linux-azure-5.4Upgrade linux-fipsUpgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-hweUpgrade linux-gcp-4.15Upgrade linux-intel-iot-realtimeUpgrade linux-awsUpgrade linux-bluefieldUpgrade linux-nvidia-tegra-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-ibm-5.4Upgrade linux-hwe-5.4Upgrade linux-gkeUpgrade linux-gkeopUpgrade linux-aws-5.4Upgrade linux-hwe-5.15Upgrade linux-lowlatencyUpgrade linux-azure-5.15Upgrade linux-azureUpgrade linux-iotUpgrade linux-oracle-5.15Upgrade linux-oracleUpgrade linux-aws-fipsUpgrade linux-ibmUpgrade linux-aws-hweUpgrade linux-gcp-5.4Upgrade linux-azure-fipsUpgrade linux-oracle-5.4Upgrade linux-raspiUpgrade linux-nvidiaUpgrade linuxUpgrade linux-xilinx-zynqmp | Sep 26, 2025 | Sep 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 18, 2025 |
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