CVE-2026-64330
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-129
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/012406f89abc52d1d5f07aa5653b519ebf6d2407Patch
- https://git.kernel.org/stable/c/313ca06e7e224ca1dfadd5722fe71fb8bc276b8bPatch
- https://git.kernel.org/stable/c/3e1b1ac47e8163627f159f30d80d51b914620dd4Patch
- https://git.kernel.org/stable/c/7b681dd5fbf60b24a13c14661e5b7735759fb491Patch
- https://git.kernel.org/stable/c/89ff289cbf5d3b659a2babc5ccaae4eaf7e7cf53Patch
- https://git.kernel.org/stable/c/c6d2af3b217a525741c472f0ab45d7d274b8468fPatch
- https://git.kernel.org/stable/c/d638ec188e95fe60f4b01106ffd41958f8fb3c2cPatch
- https://git.kernel.org/stable/c/f8163c414de8640f2ca82ce4dc93409d4cdc2fadPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.