CVE-2022-50394

i2c: ismt: Fix an out-of-bounds bug in ismt_access()

State: Published
Severity: 7.8 High
Published: Sep 18, 2025
Updated: Aug 5, 2026
Reserved: Sep 17, 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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	CISA-ADP

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 4a7bb1d93addb2f67e36fed00a53cb7f270d7b7aAffected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 03b7ef7a6c5ca1ff553470166b4919db88b810f6Affected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before bfe41d966c860a8ad4c735639d616da270c92735Affected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before cdcbae2c5003747ddfd14e29db9c1d5d7e7c44ddAffected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 9ac541a0898e8ec187a3fa7024b9701cffae6bf2Affected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 96c12fd0ec74641295e1c3c34dea3dce1b6c3422Affected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before a642469d464b2780a25a49b51ae56623c65eac34Affected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 233348a04becf133283f0076e20b317302de21d9Affected 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 39244cc754829bf707dccd12e2ce37510f5b1f8dAffected
LinuxLinux	3.9Affected before 3.9Not affected 4.9.337 through 4.9.Not affected 4.14.303 through 4.14.Not affected 4.19.270 through 4.19.Not affected 5.4.229 through 5.4.Not affected 5.10.163 through 5.10.Not affected 5.15.86 through 5.15.Not affected 6.0.16 through 6.0.Not affected 6.1.2 through 6.1.Not affected 6.2 and laterNot affected

Product

Versions

LinuxLinux

13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 4a7bb1d93addb2f67e36fed00a53cb7f270d7b7aAffected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 03b7ef7a6c5ca1ff553470166b4919db88b810f6Affected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before bfe41d966c860a8ad4c735639d616da270c92735Affected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before cdcbae2c5003747ddfd14e29db9c1d5d7e7c44ddAffected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 9ac541a0898e8ec187a3fa7024b9701cffae6bf2Affected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 96c12fd0ec74641295e1c3c34dea3dce1b6c3422Affected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before a642469d464b2780a25a49b51ae56623c65eac34Affected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 233348a04becf133283f0076e20b317302de21d9Affected
13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 to before 39244cc754829bf707dccd12e2ce37510f5b1f8dAffected

LinuxLinux

3.9Affected
before 3.9Not affected
4.9.337 through 4.9.*Not affected
4.14.303 through 4.14.*Not affected
4.19.270 through 4.19.*Not affected
5.4.229 through 5.4.*Not affected
5.10.163 through 5.10.*Not affected
5.15.86 through 5.15.*Not affected
6.0.16 through 6.0.*Not affected
6.1.2 through 6.1.*Not affected
6.2 and laterNot affected

References

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