CVE-2026-80931w1: ds28e17: reject an oversize length on an I2C block read
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before b30c021c6073559ea6851b522d8a17a524a27b4a; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before 1d08877fc37e90945df38d255715bd1d6c052d46; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before bf76d61e118b7044600a65775a3bf8adc2c6823d; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before 0f6496b34cc2919420f303b2aabdd9f71e084b56; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before cb55c5da9828f77db2a2701316949d4de1e9b773; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before ae0c79a8527044e54d81fd5a3b49ce6177633758; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before 6df05f630c84a109736642362e452089886f9974; from ebc4768ac4971eab4b570e733e47ac9dfd0e4175 before 169ae5e65e5aaf213b6a578f6478a9fd2e523606 | CNA record |
References
- https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a
- https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46
- https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d
- https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56
- https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773
- https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758
- https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974
- https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.