CVE-2026-64557
Linux kernel Bluetooth L2CAP use-after-free allows kernel crash or possible RCE via Bluetooth.
Is CVE-2026-64557 being exploited?
Not confirmed. CVE-2026-64557 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-2026-64557?
CVE-2026-64557 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-2026-64557?
Yes. A fix has been recorded for CVE-2026-64557. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64557 affect?
CVE-2026-64557 affects Linux kernel (Bluetooth L2CAP), Linux desktops/laptops with Bluetooth, Embedded Linux/IoT devices with Bluetooth. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64557?
Update Linux kernel to fixed release or disable Bluetooth until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote use-after-free via Bluetooth L2CAP can crash the kernel (DoS) and may enable local privilege escalation or remote code execution via crafted connections.
Immediate action required
- affected>= 8ffb929098a56939ac71509302eeab5b207bf262 and < b39298044e5534612511a2ff5de03ba5f6e7a820
- affected>= 8ffb929098a56939ac71509302eeab5b207bf262 and < 8c37e4338c801ebb8cee52436c01c41e009f6e87
- affected>= 8ffb929098a56939ac71509302eeab5b207bf262 and < 84e718b6a814edc84159361f9f454a4e92ae91ae
- affected>= 8ffb929098a56939ac71509302eeab5b207bf262 and < 36da806f7fbaee56ad9e81859deec203f9728700
- affected>= 8ffb929098a56939ac71509302eeab5b207bf262 and < 733e76e74e406c1d1ddc7369420dd8a47f48bb8a
- affected>= 8ffb929098a56939ac71509302eeab5b207bf262 and < 6fef032af0092ed5ccb767239a9ac1bc38c08a40
- affected3.13
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.