GHSA-J98C-Q2PF-9M22
Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33In the Linux kernel, the following vulnerability has been resolved:
hwmon: (pt5161l) Fix bugs in pt5161l_read_block_data()
Fix two bugs in pt5161l_read_block_data():
-
Buffer overrun: The local buffer rbuf is declared as u8 rbuf[24], but i2c_smbus_read_block_data() can return up to I2C_SMBUS_BLOCK_MAX (32) bytes. The i2c-core copies the data into the caller's buffer before the return value can be checked, so the post-read length validation does not prevent a stack overrun if a device returns more than 24 bytes. Resize the buffer to I2C_SMBUS_BLOCK_MAX.
-
Unexpected positive return on length mismatch: When all three retries are exhausted because the device returns data with an unexpected length, i2c_smbus_read_block_data() returns a positive byte count. The function returns this directly, and callers treat any non-negative return as success, processing stale or incomplete buffer contents. Return -EIO when retries are exhausted with a positive return value, preserving the negative error code on I2C failure.
{
"affected": [],
"aliases": [
"CVE-2026-46001"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-27T14:17:17Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pt5161l) Fix bugs in pt5161l_read_block_data()\n\nFix two bugs in pt5161l_read_block_data():\n\n1. Buffer overrun: The local buffer rbuf is declared as u8 rbuf[24],\n but i2c_smbus_read_block_data() can return up to\n I2C_SMBUS_BLOCK_MAX (32) bytes. The i2c-core copies the data into\n the caller\u0027s buffer before the return value can be checked, so\n the post-read length validation does not prevent a stack overrun\n if a device returns more than 24 bytes. Resize the buffer to\n I2C_SMBUS_BLOCK_MAX.\n\n2. Unexpected positive return on length mismatch: When all three\n retries are exhausted because the device returns data with an\n unexpected length, i2c_smbus_read_block_data() returns a positive\n byte count. The function returns this directly, and callers treat\n any non-negative return as success, processing stale or incomplete\n buffer contents. Return -EIO when retries are exhausted with a\n positive return value, preserving the negative error code on I2C\n failure.",
"id": "GHSA-j98c-q2pf-9m22",
"modified": "2026-05-27T15:33:20Z",
"published": "2026-05-27T15:33:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46001"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/24c73e93d6a756e1b8626bb259d2e07c5b89b370"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7eccabff1c9ec15e4b6fe186d5c147b13a9cdb4e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/95d48e37a1304d6148406c799479c0fb505aefa7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a11aa9c5fd9dfe62be7cfec1f2a7546afb77254c"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.