CVE-2026-63946
Linux kernel Bluetooth ISO use-after-free causing kernel memory corruption.
Is CVE-2026-63946 being exploited?
Not confirmed. CVE-2026-63946 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 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-63946?
CVE-2026-63946 is rated High with a CVSS score of 8.8. 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-2026-63946?
Yes. A fix has been recorded for CVE-2026-63946. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63946 affect?
CVE-2026-63946 affects Linux kernel (Bluetooth ISO subsystem), Linux distributions with affected kernels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63946?
Apply vendor kernel security updates or backported fix; disable Bluetooth if patch delayed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Nearby attacker can send crafted Bluetooth ISO frames to trigger a use-after-free, causing kernel crash or potential kernel RCE/privilege escalation.
Patch when possible
- affected>= ccf74f2390d60a2f9a75ef496d2564abb478f46a and < c57ea90f203c8b8b41a474f19a09000d0f841436
- affected>= ccf74f2390d60a2f9a75ef496d2564abb478f46a and < 119fb6f80c44dc1c65d604cf28e64c56bd9b6568
- affected>= ccf74f2390d60a2f9a75ef496d2564abb478f46a and < b04ec131325baf4ea4577d6c6e6b86cf092e3731
- affected>= ccf74f2390d60a2f9a75ef496d2564abb478f46a and < c318aa51830a3d2cc1229968fe521441c97356cd
- affected>= ccf74f2390d60a2f9a75ef496d2564abb478f46a and < 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
- affected>= ccf74f2390d60a2f9a75ef496d2564abb478f46a and < 47f23a259517abbdb8032c057a1e8a6bf3734878
- affected6.0
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.