CVE-2026-63893
Linux kernel Thunderbolt parsing bug leaks kernel memory via crafted XDomain properties.
Is CVE-2026-63893 being exploited?
Not confirmed. CVE-2026-63893 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-63893?
CVE-2026-63893 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-63893?
Yes. A fix has been recorded for CVE-2026-63893. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63893 affect?
CVE-2026-63893 affects Linux kernel (thunderbolt module), Systems using Thunderbolt XDomain/XDP interfaces. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63893?
Apply vendor/linux kernel security update promptly; restrict Thunderbolt access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local or device-attached attacker can read kernel memory via crafted Thunderbolt XDomain properties; sensitive data may be exfiltrated via sysfs attributes.
Patch when possible
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < 6a63623621639acbb39bc2d9fb09559681716695
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < e8a0b0a93a6ef958e70b1dd4930beb6dc0026b36
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < 9fee50c4e1e42f6d3cbe30df584f9f648f626071
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < 8d4a758b407ab3de3be86d1ceadfa35d717d30c7
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < 5c06a3043ad944f087bb2ae0aae28d820bb9f460
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < 31b98e503ecca8077e5247253dd5425ab84bc96d
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < a47784aee77f33f786dc5d7375db821bdae68792
- affected>= cdae7c07e3e3509eaabc18c1640a55dc5b99c179 and < 01deda0152066c6c955f0619114ea6afa070aaec
- affected4.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.