Widely deployed Linux kernel; core infrastructure; Bluetooth flaw affects many environments.
CVE-2026-43018
Linux kernel Bluetooth UAF fix in hci_le_remote_conn_param_req_evt.
Is CVE-2026-43018 being exploited?
Not confirmed. CVE-2026-43018 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 0.26% probability of exploitation in the next 30 days.
How severe is CVE-2026-43018?
CVE-2026-43018 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-2026-43018?
Yes. A fix has been recorded for CVE-2026-43018. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43018 affect?
CVE-2026-43018 affects Linux kernel (Bluetooth subsystem). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43018?
Apply the latest kernel update with Bluetooth fix
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local memory safety issue in Bluetooth path; unlocked hci_conn usage may cause UAF, kernel crash, or escalation.
Patch when possible
- affected>= 95118dd4edfec950898a00180c6f998df0a6406d and < 59eecf0ffde15670e6a5e10c47be67f73d843b20
- affected>= 95118dd4edfec950898a00180c6f998df0a6406d and < 5fb69e1eeea9d6cba80517e9f058b56b34bc3a81
- affected>= 95118dd4edfec950898a00180c6f998df0a6406d and < 7cadb03be37e761130edb153544fe0770a842b19
- affected>= 95118dd4edfec950898a00180c6f998df0a6406d and < 1d0bdbfe3e91c11f0a704c52443a9446a10d699c
- affected>= 95118dd4edfec950898a00180c6f998df0a6406d and < ea3cd36d7382d5f8309df04c275d20df139ed42c
- affected>= 95118dd4edfec950898a00180c6f998df0a6406d and < b255531b27da336571411248c2a72a350662bd09
- affected5.17
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.