CVE-2026-52948: Linux kernel · i2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ffbcf31f032eb454ebfd29309f51366fe57f4ac4 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:49 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in ffbcf31f032eb454ebfd29309f51366fe57f4ac4, ff02add34ffd03449b8115904ebe2ec4fed022d4, e9ffd5f5050fbb199d270a85614cd27ebed6fbac +5
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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]
References
- git.kernel.org/stable/c/e9ffd5f5050fbb199d270a85614cd27ebed6fbac (opens in a new tab)
- git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691 (opens in a new tab)
- git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5 (opens in a new tab)
- git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2 (opens in a new tab)
- git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4 (opens in a new tab)
- git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4 (opens in a new tab)
- git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7 (opens in a new tab)
- git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923ea (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)