CVE-2026-74508
Linux kernel Bluetooth HIDP reads uninitialized byte from malformed SDUs.
Is CVE-2026-74508 being exploited?
Not confirmed. CVE-2026-74508 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-2026-74508?
CVE-2026-74508 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-2026-74508?
Yes. A fix has been recorded for CVE-2026-74508. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74508 affect?
CVE-2026-74508 affects Linux kernel (Bluetooth HIDP), Devices using Linux Bluetooth stack (desktops, laptops, embedded, IoT). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74508?
Install updated Linux kernel/Bluetooth HIDP patches ASAP; limit Bluetooth trust/pairing.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Adjacent Bluetooth attacker can send malformed L2CAP/HCI packets causing uninitialized memory use, terminating HIDP sessions, potential crash or memory disclosure.
Patch when possible
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 238c333bc4b3f245c626632e8bfa3c9dab97f51b
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 567a2a0a633f2ea5fdccaf3517c09f22c9d860c7
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 97b61241ab45bfa5b0526cb0f3978942493bc811
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 2ebf63aa557a69990b4e9ea22be224d58aabce96
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 854194494a6f726a60b90b76059148bf08df023d
- affected>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 47778d2c2087b5d192398f6fddf692d16a5431cf
- affected2.6.12
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.