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Vulnerability record · CVE-2026-64330 · published 25 July 2026

CVE-2026-64330: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: Validate SVID index in svdm_consume_modes() In svdm_consume_modes(), the SVID value is read from pmdata->svids using pmdata->svid_index as an array index without bounds validation: paltmode->svid = pmdata->svids[pmdata->svid_index]; If pmdata->svid_index is driven beyond SVID_DISCOVERY_MAX (16), it results in an out-of-bounds read of the pmdata->svids array. Because pd_mode_data is embedded inside struct tcpm_port, indexing past svids reads into adjacent fields. In particular: - At index 16, it reads the altmodes count. - At index 18 and beyond, it reads into altmode_desc[], which contains partner-supplied SVDM Discovery Modes VDOs. By injecting a chosen SVID into altmode_desc[0].vdo and driving svid_index to 20, the partner can force paltmode->svid to be loaded with an arbitrary, partner- chosen SVID, which is then registered via typec_partner_register_altmode(). Fix this by validating that pmdata->svid_index is non-negative and strictly less than pmdata->nsvids before accessing the pmdata->svids array inside svdm_consume_modes().

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-129 · CWE-129
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
4 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: Validate SVID index in svdm_consume_modes() In svdm_consume_modes(), the SVID value is read from pmdata->svids using pmdata->svid_index as an array index without bounds validation: paltmode->svid = pmdata->svids[pmdata->svid_index]; If pmdata->svid_index is driven beyond SVID_DISCOVERY_MAX (16), it results in an out-of-bounds read of the pmdata->svids array. Because pd_mode_data is embedded inside struct tcpm_port, indexing past svids reads into adjacent fields. In particular: - At index 16, it reads the altmodes count. - At index 18 and beyond, it reads into altmode_desc[], which contains partner-supplied SVDM Discovery Modes VDOs. By injecting a chosen SVID into altmode_desc[0].vdo and driving svid_index to 20, the partner can force paltmode->svid to be loaded with an arbitrary, partner- chosen SVID, which is then registered via typec_partner_register_altmode(). Fix this by validating that pmdata->svid_index is non-negative and strictly less than pmdata->nsvids before accessing the pmdata->svids array inside svdm_consume_modes().

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/012406f89abc52d1d5f07aa5653b519ebf6d2407 Patch
https://git.kernel.org/stable/c/313ca06e7e224ca1dfadd5722fe71fb8bc276b8b Patch
https://git.kernel.org/stable/c/3e1b1ac47e8163627f159f30d80d51b914620dd4 Patch
https://git.kernel.org/stable/c/7b681dd5fbf60b24a13c14661e5b7735759fb491 Patch
https://git.kernel.org/stable/c/89ff289cbf5d3b659a2babc5ccaae4eaf7e7cf53 Patch
https://git.kernel.org/stable/c/c6d2af3b217a525741c472f0ab45d7d274b8468f Patch
https://git.kernel.org/stable/c/d638ec188e95fe60f4b01106ffd41958f8fb3c2c Patch
https://git.kernel.org/stable/c/f8163c414de8640f2ca82ce4dc93409d4cdc2fad Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64330), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.