Medium [CVE-2026-63961] validate count before reading Status Update VDO
This medium-severity Red Hat Linux advisory covers CVE-2026-63961 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: altmodes/displayport: validate count before reading Status Update VDO A broken/malicious device can send the incorrect count for a status update VDO, which will cause the kernel to read uninitialized stack data and send it off elsewhere.
Fix this up by correctly verifying the count for the update object. A flaw was found in the Linux kernel's USB Type-C DisplayPort (DP) alternate mode.
A malicious or improperly configured USB-C device can send a malformed status update Vendor Defined Object (VDO), which is a data structure used for communication. This vulnerability allows an attacker with physical access to a malicious USB-C device to potentially gain access to sensitive system information.
This vulnerability is rated as having a Moderate impact because successful exploitation requires physical access to attach a malicious USB Type-C peripheral to the host. Systems deployed in physically secured server environments or virtualized guest instances lacking USB device passthrough are not exposed to this issue.
Although an attacker with physical access could receive uninitialized kernel stack data over DisplayPort alternate mode communication, the issue does not allow code execution or data modification. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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