Samsung Exynos NR RRC Modem Vulnerabilities

Baseband crash in Samsung Exynos mobile processors and modems allows a nearby attacker operating a rogue 5G base station to remotely crash the cellular modem by sending malformed, unauthenticated downlink NR RRC Setup messages. The flaw affects a wide range of Exynos chipsets - from Exynos 1080 through 2500, W1000, and Modem 5300/5400/5410 - used in Samsung Galaxy smartphones and tablets. Exploitation results in loss of cellular connectivity (DoS) on the affected device; no public exploit code has been identified at time of analysis.

NULL pointer dereference in the 5G NR baseband of Samsung Exynos processors and modems causes a denial-of-service condition when a malformed RRC Reconfiguration message is received from the network. Sixteen Exynos chip variants are affected, spanning Samsung flagship, mid-range, and wearable devices - including Exynos 850, 1080, 2100, 2200, 2400, W920, W930, W1000, Modem 5410, and others. An attacker capable of injecting or spoofing RRC layer signaling (e.g., via a rogue base station) can trigger a crash in the L2/RRC processing stack, disrupting cellular connectivity. No public exploit code or active exploitation has been identified at time of analysis.