Advisory [CVE-2026-63959] validate header NDO against RX_BYTE_CNT
This security Red Hat Linux advisory covers CVE-2026-63959.
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Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT A broken/malicious port can transmit a CRC-valid frame whose header advertises up to seven data objects but whose body carries fewer than that.
Check for this, and rightfully reject the message, instead of reading from uninitialized stack memory. A flaw was found in the Linux kernel's USB Type-C (Universal Serial Bus Type-C) subsystem.
This can lead to the system reading from uninitialized memory, potentially disclosing sensitive information or causing system instability. Red Hat severity: not rated.
Weakness: CWE-130. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
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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