CVE-2026-63959
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.
Affected versions
Linux kernel versions
5.10
and later are affected. Fixed in
6.6.143,
6.12.93,
6.18.35,
7.0.12,
7.1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-63959?
CVE-2026-63959 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10 onward and has been patched in 6.6.143, 6.12.93, 6.18.35 and others. CVE-2026-63959 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-63959?
Yes — CVE-2026-63959 has been patched. Fixed versions include 6.6.143, 6.12.93, 6.18.35 and others. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-63959 actively exploited?
No — CVE-2026-63959 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.