Kernel memory corruption via oversized I2C length
Published Sep 11, 2026 · Updated Sep 11, 2026
Out-of-bounds write in the DS28E17 bridge driver in Linux allows physically proximate attackers to corrupt kernel memory. At both I2C_M_RECV_LEN sites, w1_f19_i2c_master_transfer() trusts a downstream slave's length byte and passes values up to 255 to w1_f19_i2c_read(), which writes beyond the 34-byte caller buffer when the value exceeds 32. Exploitation requires a DS28E17 1-Wire-to-I2C bridge and control of its downstream slave; the published record does not establish code execution or a specific crash outcome.
Summary
What happened
Out-of-bounds write in the DS28E17 bridge driver in Linux allows physically proximate attackers to corrupt kernel memory. At both I2C_M_RECV_LEN sites, w1_f19_i2c_master_transfer() trusts a downstream slave's length byte and passes values up to 255 to w1_f19_i2c_read(), which writes beyond the 34-byte caller buffer when the value exceeds 32. Exploitation requires a DS28E17 1-Wire-to-I2C bridge and control of its downstream slave; the published record does not establish code execution or a specific crash outcome.
The record
- CVE
- CVE-2026-80931
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1200
- Attack vector
- physical
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.15
- Affected versionversion=ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <169ae5e65e5aaf213b6a578f6478a9fd2e523606
- Affected versionversion=ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <6df05f630c84a109736642362e452089886f9974
- Affected versionversion=ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <ae0c79a8527044e54d81fd5a3b49ce6177633758
- Affected versionversion=ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <cb55c5da9828f77db2a2701316949d4de1e9b773
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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