CVE-2026-52948i2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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]
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before e9ffd5f5050fbb199d270a85614cd27ebed6fbac; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before 0b88ecfbc9dc33b4db8836c37b50cf174e6c0691; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before 943e318eedbeaeea08ece3f5dd44c982f4ed2ef5; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before aa6ef734016912653a909477fb30aeb66c98b3a2; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before ff02add34ffd03449b8115904ebe2ec4fed022d4; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before ffbcf31f032eb454ebfd29309f51366fe57f4ac4; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before 4576621dc6577f21a032acfd16c3ad61907a5ea7; from cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d before 617eb7c0961a8dfcfc811844a6396e406b2923ea | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.29.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 2.6.29; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/e9ffd5f5050fbb199d270a85614cd27ebed6fbacpatch
- https://git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691patch
- https://git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5patch
- https://git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2patch
- https://git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4patch
- https://git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4patch
- https://git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7patch
- https://git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923eapatch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.