CVE-2026-74530
Linux kernel Bluetooth use-after-free may cause kernel crash or privilege escalation.
Is CVE-2026-74530 being exploited?
Not confirmed. CVE-2026-74530 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 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-74530?
CVE-2026-74530 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-2026-74530?
Yes. A fix has been recorded for CVE-2026-74530. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74530 affect?
CVE-2026-74530 affects Linux kernel (Bluetooth subsystem: hci_connect_big_sync / hci_sync). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74530?
Apply vendor kernel updates, restrict Bluetooth access, and reboot affected hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Kernel use-after-free in Bluetooth hci_connect_big_sync: attacker with Bluetooth access can trigger kernel crash or memory corruption, potentially enabling privilege escalation.
Patch when possible
- affected>= 024421cf39923927ab2b5fe895d1d922b9abe67f and < 2d91e6244b69d752503b2d44020d8b0e323dbd38
- affected>= 024421cf39923927ab2b5fe895d1d922b9abe67f and < 56e78b670356caab0b607e8aad4cf819a1909d07
- affected620810ac1f7f1133a9ac403e132b3ad6995ddf39
- affectedee0586ad64a805eaf1a9a10100e908627a561e34
- affected>= 6.12.28 and < 6.13
- affected>= 6.14.6 and < 6.15
- 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.