CVE-2026-12522
Stack buffer overflow in HL7800 modem driver allows remote crash or code execution via rogue cellular network.
Is CVE-2026-12522 being exploited?
Not confirmed. CVE-2026-12522 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-2026-12522?
CVE-2026-12522 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-2026-12522?
Yes. A fix has been recorded for CVE-2026-12522. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12522 affect?
CVE-2026-12522 affects HL7800 modem driver (drivers/modem/vendor_standalone/hl7800.c), Devices using HL7800 cellular modems or vendor implementations. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12522?
Apply vendor/kernel firmware patch immediately; avoid untrusted cellular networks.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote stack overflow during +CGCONTRDP parsing can cause device crash and potentially remote code execution/privilege escalation without user interaction.
Patch when possible
- affected>= 2.4.0 and < 4.4.2
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.