CVE-2022-50394
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.17% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/03b7ef7a6c5ca1ff553470166b4919db88b810f6Patch
- https://git.kernel.org/stable/c/233348a04becf133283f0076e20b317302de21d9Patch
- https://git.kernel.org/stable/c/39244cc754829bf707dccd12e2ce37510f5b1f8dPatch
- https://git.kernel.org/stable/c/4a7bb1d93addb2f67e36fed00a53cb7f270d7b7aPatch
- https://git.kernel.org/stable/c/96c12fd0ec74641295e1c3c34dea3dce1b6c3422Patch
- https://git.kernel.org/stable/c/9ac541a0898e8ec187a3fa7024b9701cffae6bf2Patch
- https://git.kernel.org/stable/c/a642469d464b2780a25a49b51ae56623c65eac34Patch
- https://git.kernel.org/stable/c/bfe41d966c860a8ad4c735639d616da270c92735Patch
- https://git.kernel.org/stable/c/cdcbae2c5003747ddfd14e29db9c1d5d7e7c44ddPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.