CVE-2026-63866
Linux mt7996 Wi‑Fi driver flaw allows kernel crash or potential code execution via crafted frames
Is CVE-2026-63866 being exploited?
Not confirmed. CVE-2026-63866 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 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-63866?
CVE-2026-63866 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-2026-63866?
Yes. A fix has been recorded for CVE-2026-63866. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63866 affect?
CVE-2026-63866 affects Linux kernel (mt76 driver, mt7996), Devices using MediaTek MT7996 Wi‑Fi chipset. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63866?
Update kernel/vendor firmware to patched release and reboot affected devices.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Adjacent attacker can send crafted Wi‑Fi frames triggering a kernel use-after-free -> DoS or possible privilege escalation/RCE.
Patch when possible
- affected>= dd82a9e02c054052b5899872c1f32805428f6131 and < 455a48685feebf2d9c1656caad77f9ba1da7b06e
- affected>= dd82a9e02c054052b5899872c1f32805428f6131 and < c575459b485c47615491b1fd29f04b43fdc3da56
- affected>= dd82a9e02c054052b5899872c1f32805428f6131 and < 88973240dc7c976dd320b36a9e6d925c9be083ae
- affected6.15
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.