High 7.8Published May 1, 2026

CVE-2026-31729usb: typec: ucsi: validate connector number in ucsi_notify_common()

Updated under an hour ago (Oct 28, 2026, 6:30 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a 7-bit field (0-127) that is used to index into the connector array in ucsi_connector_change(). However, the array is only allocated for the number of connectors reported by the device (typically 2-4 entries). A malicious or malfunctioning device could report an out-of-range connector number in the CCI, causing an out-of-bounds array access in ucsi_connector_change(). Add a bounds check in ucsi_notify_common(), the central point where CCI is parsed after arriving from hardware, so that bogus connector numbers are rejected before they propagate further.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from bdc62f2bae8fb0e8e99574de5232f0a3c54a27df before f6dcbf2b024d55549959402f1db6c614e51d52cb; from bdc62f2bae8fb0e8e99574de5232f0a3c54a27df before f4e608fe12b7ac6a4a57176ab0296bb5a110a078; from bdc62f2bae8fb0e8e99574de5232f0a3c54a27df before 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0; from bdc62f2bae8fb0e8e99574de5232f0a3c54a27df before d2d8c17ac01a1b1f638ea5d340a884ccc5015186	CNA record
linux linux_kernel linux:linux_kernel	from 5.5 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; 7.0; 7.0; 7.0; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb	patch
https://git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078	patch
https://git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0	patch
https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186	patch

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.