CVE-2026-80931w1: ds28e17: reject an oversize length on an I2C block read
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < b30c021c6073559ea6851b522d8a17a524a27b4a
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < 1d08877fc37e90945df38d255715bd1d6c052d46
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < bf76d61e118b7044600a65775a3bf8adc2c6823d
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < 0f6496b34cc2919420f303b2aabdd9f71e084b56
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < cb55c5da9828f77db2a2701316949d4de1e9b773
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < ae0c79a8527044e54d81fd5a3b49ce6177633758
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < 6df05f630c84a109736642362e452089886f9974
- affected ebc4768ac4971eab4b570e733e47ac9dfd0e4175 – < 169ae5e65e5aaf213b6a578f6478a9fd2e523606
- affected 4.15
- unaffected < 4.15
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a (opens in a new tab)
- https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46 (opens in a new tab)
- https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d (opens in a new tab)
- https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56 (opens in a new tab)
- https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773 (opens in a new tab)
- https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758 (opens in a new tab)
- https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974 (opens in a new tab)
- https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76254 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80931)Record last updated .