i2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-52948
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:04 UTC
Updated2026-07-14 16:58:13 UTC
DescriptionIn 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]

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001850000 probability, percentile 0.082260000 (date 2026-07-13)

Problem Types: CWE-190

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d e9ffd5f5050fbb199d270a85614cd27ebed6fbac git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d 0b88ecfbc9dc33b4db8836c37b50cf174e6c0691 git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d 943e318eedbeaeea08ece3f5dd44c982f4ed2ef5 git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d aa6ef734016912653a909477fb30aeb66c98b3a2 git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d ff02add34ffd03449b8115904ebe2ec4fed022d4 git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d ffbcf31f032eb454ebfd29309f51366fe57f4ac4 git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d 4576621dc6577f21a032acfd16c3ad61907a5ea7 git Not specified
CNA Linux Linux affected cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d 617eb7c0961a8dfcfc811844a6396e406b2923ea git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e9ffd5f5050fbb199d270a85614cd27ebed6fbac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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