# CVE-2022-50394: linux: In the Linux kernel, the following vulnerability has been resolved:  i2c: ismt: Fix an out-of-bounds bug in ismt_acce...

CVE-2022-50394 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50394, released September 18, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50394
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 18, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50394](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50394.md) | Sep 18, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50394](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50394.md) | Sep 18, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50394](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50394.md) | Sep 18, 2025 |

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