{"id":"CVE-2026-52948","summary":"i2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: dev: prevent integer overflow in I2C_TIMEOUT ioctl\n\nWhile fuzzing with Syzkaller, a persistent `schedule_timeout: wrong\ntimeout value` warning was observed, accompanied by SMBus controller\nstate machine corruption.\n\nThe I2C_TIMEOUT ioctl accepts a user-provided timeout in multiples of\n10 ms. The user argument is checked against INT_MAX, but it is\nsubsequently multiplied by 10 before being passed to msecs_to_jiffies().\n\nA malicious user can pass a large value (e.g., 429496729) that passes\nthe `arg \u003e INT_MAX` check but overflows when multiplied by 10. This\nresults in a truncated 32-bit unsigned value that bypasses the\ninternal `(int)m \u003c 0` check in `msecs_to_jiffies()`.\n\nThe truncated value is then assigned to `client-\u003eadapter-\u003etimeout`\n(a signed 32-bit int), which is reinterpreted as a negative number.\nWhen passed to wait_for_completion_timeout(), this negative value\nundergoes sign extension to a 64-bit unsigned long, triggering the\n`schedule_timeout` warning and causing premature returns. This leaves\nthe SMBus state machine in an unrecoverable state, constituting a\nlocal Denial of Service (DoS).\n\nFix this by bounding the user argument to `INT_MAX / 10`.\n\n[wsa: move the comment as well]","modified":"2026-07-12T03:55:16.627151368Z","published":"2026-06-24T16:26:05.719Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52948.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0b88ecfbc9dc33b4db8836c37b50cf174e6c0691"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4576621dc6577f21a032acfd16c3ad61907a5ea7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/617eb7c0961a8dfcfc811844a6396e406b2923ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/943e318eedbeaeea08ece3f5dd44c982f4ed2ef5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa6ef734016912653a909477fb30aeb66c98b3a2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e9ffd5f5050fbb199d270a85614cd27ebed6fbac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff02add34ffd03449b8115904ebe2ec4fed022d4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ffbcf31f032eb454ebfd29309f51366fe57f4ac4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52948.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52948"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cd97f39b7cdf1c8a9c9f52865eec795b7f0c811d"},{"fixed":"e9ffd5f5050fbb199d270a85614cd27ebed6fbac"},{"fixed":"0b88ecfbc9dc33b4db8836c37b50cf174e6c0691"},{"fixed":"943e318eedbeaeea08ece3f5dd44c982f4ed2ef5"},{"fixed":"aa6ef734016912653a909477fb30aeb66c98b3a2"},{"fixed":"ff02add34ffd03449b8115904ebe2ec4fed022d4"},{"fixed":"ffbcf31f032eb454ebfd29309f51366fe57f4ac4"},{"fixed":"4576621dc6577f21a032acfd16c3ad61907a5ea7"},{"fixed":"617eb7c0961a8dfcfc811844a6396e406b2923ea"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52948.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52948.json"}}],"schema_version":"1.7.5"}