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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/03b7ef7a6c5ca1ff553470166b4919db88b810f6 cve-icon cve-icon
https://git.kernel.org/stable/c/233348a04becf133283f0076e20b317302de21d9 cve-icon cve-icon
https://git.kernel.org/stable/c/39244cc754829bf707dccd12e2ce37510f5b1f8d cve-icon cve-icon
https://git.kernel.org/stable/c/4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a cve-icon cve-icon
https://git.kernel.org/stable/c/96c12fd0ec74641295e1c3c34dea3dce1b6c3422 cve-icon cve-icon
https://git.kernel.org/stable/c/9ac541a0898e8ec187a3fa7024b9701cffae6bf2 cve-icon cve-icon
https://git.kernel.org/stable/c/a642469d464b2780a25a49b51ae56623c65eac34 cve-icon cve-icon
https://git.kernel.org/stable/c/bfe41d966c860a8ad4c735639d616da270c92735 cve-icon cve-icon
https://git.kernel.org/stable/c/cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025091853-CVE-2022-50394-fcaa@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50394 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50394 cve-icon
History

Fri, 19 Sep 2025 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Fri, 19 Sep 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Thu, 18 Sep 2025 13:45:00 +0000

Type Values Removed Values Added
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.
Title i2c: ismt: Fix an out-of-bounds bug in ismt_access()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-09-18T13:33:12.992Z

Updated: 2025-09-18T13:33:12.992Z

Reserved: 2025-09-17T14:53:06.998Z

Link: CVE-2022-50394

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-09-18T14:15:38.490

Modified: 2025-09-18T14:15:38.490

Link: CVE-2022-50394

cve-icon Redhat

Severity : Important

Publid Date: 2025-09-18T00:00:00Z

Links: CVE-2022-50394 - Bugzilla