{"id":"CVE-2026-31729","title":"usb: typec: ucsi: validate connector number in ucsi_notify_common()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_notify_common()\n\nThe connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a\n7-bit field (0-127) that is u…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < f6dcbf2b024d55549959402f1db6c614e51d52cb","Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < f4e608fe12b7ac6a4a57176ab0296bb5a110a078","Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0","Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < d2d8c17ac01a1b1f638ea5d340a884ccc5015186","Linux 5.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:24:39.973230Z"},"published":"2026-05-01","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:32:23.764Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31729","references":[{"url":"https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb"},{"url":"https://git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078"},{"url":"https://git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0"},{"url":"https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02526,"ingestedAt":"2026-11-06T15:54:04.043Z","slug":"CVE-2026-31729","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_notify_common()\n\nThe connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a\n7-bit field (0-127) that is used to index into the connector array in\nucsi_connector_change(). However, the array is only allocated for the\nnumber of connectors reported by the device (typically 2-4 entries).\n\nA malicious or malfunctioning device could report an out-of-range\nconnector number in the CCI, causing an out-of-bounds array access in\nucsi_connector_change().\n\nAdd a bounds check in ucsi_notify_common(), the central point where CCI\nis parsed after arriving from hardware, so that bogus connector numbers\nare rejected before they propagate further.\n\n## Affected\n\n- `Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < f6dcbf2b024d55549959402f1db6c614e51d52cb`\n- `Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < f4e608fe12b7ac6a4a57176ab0296bb5a110a078`\n- `Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0`\n- `Linux >= bdc62f2bae8fb0e8e99574de5232f0a3c54a27df < d2d8c17ac01a1b1f638ea5d340a884ccc5015186`\n- `Linux 5.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}