CVE-2026-64330: usb: typec: tcpm: Validate SVID index in svdm_consume_modes()
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: tcpm: Validate SVID index in svdmconsumemodes()
In svdmconsumemodes(), the SVID value is read from pmdata->svids using pmdata->svidindex as an array index without bounds validation:
paltmode->svid = pmdata->svids[pmdata->svidindex];
If pmdata->svidindex is driven beyond SVIDDISCOVERYMAX (16), it results in an out-of-bounds read of the pmdata->svids array. Because pdmodedata is embedded inside struct tcpmport, 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 altmodedesc[], which contains partner-supplied SVDM Discovery Modes VDOs.
By injecting a chosen SVID into altmodedesc[0].vdo and driving svidindex to 20, the partner can force paltmode->svid to be loaded with an arbitrary, partner- chosen SVID, which is then registered via typecpartnerregisteraltmode().
Fix this by validating that pmdata->svidindex is non-negative and strictly less than pmdata->nsvids before accessing the pmdata->svids array inside svdmconsumemodes().
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-31.31.1 - Compensating control
In svdm_consume_modes(), validate that pmdata->svid_index is non-negative and strictly less than pmdata->nsvids before accessing pmdata->svids[pmdata->svid_index].
Event History
Frequently Asked Questions
Who is realistically exposed to this issue?
Systems running the affected Linux kernel Type-C TCPM code are exposed when they interact with a USB Type-C partner that can supply crafted SVDM Discovery Modes data. Exploitation requires local access, as reflected by the CVSS local attack vector.
What does an attacker need to control?
An attacker needs to drive the SVID index beyond the valid discovered-SVID range and provide partner-supplied SVDM Discovery Modes VDO data. The described path uses a chosen value in altmode_desc[0].vdo with svid_index driven to 20 to register an alternate mode using an attacker-chosen SVID.
How can I determine whether my kernel includes the fix?
Check whether the kernel source or applied stable patches validate pmdata->svid_index as non-negative and strictly less than pmdata->nsvids before indexing pmdata->svids in svdm_consume_modes(). The listed stable commits are 89ff289cbf5d3b659a2babc5ccaae4eaf7e7cf53, d638ec188e95fe60f4b01106ffd41958f8fb3c2c, and f8163c414de8640f2ca82ce4dc93409d4cdc2fad.