CVE-2026-74509
Linux Bluetooth HCI use-after-free in advertising paths causing kernel memory corruption
Is CVE-2026-74509 being exploited?
Not confirmed. CVE-2026-74509 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 0.25% probability of exploitation in the next 30 days.
How severe is CVE-2026-74509?
CVE-2026-74509 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-2026-74509?
Yes. A fix has been recorded for CVE-2026-74509. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74509 affect?
CVE-2026-74509 affects Linux kernel (Bluetooth HCI: hci_sync, adv/scan/periodic advertising), Bluetooth-enabled Linux servers/workstations, Embedded/IoT devices using affected kernels, Android kernels without patch. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74509?
Apply vendor/upstream Linux kernel updates; restrict/disable Bluetooth until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bluetooth advertising UAF can cause kernel memory corruption, crashes, and may allow local/nearby attackers to achieve privilege escalation or kernel code execution.
Immediate action required
- affected>= cba6b758711cab946c787f7c15be92cc749b8e1f and < 565971488191bf54a87a417abafab6ad0de72201
- affected>= cba6b758711cab946c787f7c15be92cc749b8e1f and < c4cec575a6d6f7c36808a3a0017b0675968bb06b
- affected>= cba6b758711cab946c787f7c15be92cc749b8e1f and < 95cdcd8c82a501931fd3ae9b3811b0b6da167e94
- affected>= cba6b758711cab946c787f7c15be92cc749b8e1f and < eb1d8318764de7216e6dbba29a24d69f7ce51348
- affected>= cba6b758711cab946c787f7c15be92cc749b8e1f and < b16ebdbebd2d37f4cdc590bc3e9db71fe90350a3
- affected>= cba6b758711cab946c787f7c15be92cc749b8e1f and < cdc36db204ffd97b947d64374cf23a210dc74777
- affected42fe380baaaccbe635c34ca07b29d19b9ec2498d
- affected>= 5.15.210 and < 5.16
- 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.