CVE-2026-74531
Linux kernel Bluetooth use-after-free (hci_conn) allowing kernel memory corruption.
Is CVE-2026-74531 being exploited?
Not confirmed. CVE-2026-74531 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-2026-74531?
CVE-2026-74531 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-2026-74531?
Yes. A fix has been recorded for CVE-2026-74531. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74531 affect?
CVE-2026-74531 affects Linux kernel (Bluetooth hci_conn), Linux desktops with Bluetooth, Linux servers with Bluetooth adapters, 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-2026-74531?
Install vendor kernel updates for Bluetooth subsystems and reboot
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Nearby attacker or local user can trigger a use‑after‑free in Bluetooth hci_conn, causing kernel crash or possible kernel RCE/elevation.
Patch when possible
- affected>= 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c and < 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6
- affected>= 227a0cdf4a028a73dc256d0f5144b4808d718893 and < 963fb4b8e7d1ab07b4ae45bf15d41e667c88caca
- affected>= 227a0cdf4a028a73dc256d0f5144b4808d718893 and < e8f9fef362bab431d95371d3406bc720350290c3
- affected>= 227a0cdf4a028a73dc256d0f5144b4808d718893 and < fa812cfa81aa3d4a7b6ce8277979af57b3f79712
- affected>= 227a0cdf4a028a73dc256d0f5144b4808d718893 and < 5761d003daa987ac81463f570713ce9c9dd204e5
- affected7fe4d391e937c2f048a43ff4b421e677f10d83c0
- affected58afdc9b18871eb1d461c725be9e9f3f44a39aeb
- affected>= 6.6.51 and < 6.6.151
- affected>= 6.1.184 and < 6.2
- affected>= 6.10.10 and < 6.11
- affected6.11
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.