Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-80931

w1: ds28e17: reject an oversize length on an I2C block read

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in b30c021c6073559ea6851b522d8a17a524a27b4a; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in 1d08877fc37e90945df38d255715bd1d6c052d46; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in bf76d61e118b7044600a65775a3bf8adc2c6823d; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in 0f6496b34cc2919420f303b2aabdd9f71e084b56; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in cb55c5da9828f77db2a2701316949d4de1e9b773; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in ae0c79a8527044e54d81fd5a3b49ce6177633758; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in 6df05f630c84a109736642362e452089886f9974; From ebc4768ac4971eab4b570e733e47ac9dfd0e4175 · fixed in 169ae5e65e5aaf213b6a578f6478a9fd2e523606

  • Linux Linux

    4.15

  • KernelLinux

    From 4.15.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8

git.kernel.org