CVE-2022-50394: i2c: ismt: Fix an out-of-bounds bug in ismt_access()
Vulnerability summary
CVE-2022-50394 is a high (CVSS 7.8) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 18-09-2025PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HDiffers
- NVDNIST7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HDiffers
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.17% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu120 products
- linuxAll versions (No fix recorded) | < 4.15.0-208.220 | < 5.4.0-144.161 | < 5.15.0-69.76
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1153.166 | < 5.4.0-1097.105 | < 5.15.0-1033.37
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < 4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < 03b7ef7a6c5ca1ff553470166b4919db88b810f6 | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < bfe41d966c860a8ad4c735639d616da270c92735 | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < 9ac541a0898e8ec187a3fa7024b9701cffae6bf2 | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < 96c12fd0ec74641295e1c3c34dea3dce1b6c3422 | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < a642469d464b2780a25a49b51ae56623c65eac34 | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < 233348a04becf133283f0076e20b317302de21d9 | ≥ 13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9, < 39244cc754829bf707dccd12e2ce37510f5b1f8d | 3.9
- linux_kernel≥ 3.9, < 4.9.337 | ≥ 4.10, < 4.14.303 | ≥ 4.15, < 4.19.270 | ≥ 4.20, < 5.4.229 | ≥ 5.5, < 5.10.163 | ≥ 5.11, < 5.15.86 | ≥ 5.16, < 6.0.16 | ≥ 6.1, < 6.1.2
Debian1 product
- linux< 6.1.4-1
3 vendors · 123 products
