GHSA-3CWQ-59J3-H9HJ
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In the Linux kernel, the following vulnerability has been resolved:
w1: ds28e17: reject an oversize length on an I2C block read
w1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire to I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the device. The downstream slave puts a length byte in buf[0]. The driver then reads that many bytes into buf[1] with w1_f19_i2c_read().
buf[0] is controlled by the device and can be 0 to 255. w1_f19_i2c_read() only rejects a zero count. The caller buffer is I2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read run past it, up to about 222 bytes out of bounds.
The SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That check runs after master_xfer returns. By then the write is already done. i2c-algo-bit rejects an oversize length before it copies, and returns -EPROTO.
Reject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the same way i2c-algo-bit does.
{
"affected": [],
"aliases": [
"CVE-2026-80931"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:18:56Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nw1: ds28e17: reject an oversize length on an I2C block read\n\nw1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire\nto I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the\ndevice. The downstream slave puts a length byte in buf[0]. The driver\nthen reads that many bytes into buf[1] with w1_f19_i2c_read().\n\nbuf[0] is controlled by the device and can be 0 to 255.\nw1_f19_i2c_read() only rejects a zero count. The caller buffer is\nI2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read\nrun past it, up to about 222 bytes out of bounds.\n\nThe SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That\ncheck runs after master_xfer returns. By then the write is already\ndone. i2c-algo-bit rejects an oversize length before it copies, and\nreturns -EPROTO.\n\nReject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the\nsame way i2c-algo-bit does.",
"id": "GHSA-3cwq-59j3-h9hj",
"modified": "2026-09-14T15:32:19Z",
"published": "2026-09-11T21:31:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80931"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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