CVE-2026-12519
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV events, leading to out-of-bounds stack read and a single out-of-bounds stack write. The vulnerability can be triggered by a rogue base station or compromised modem without application interaction.
Risk Assessment
The risk includes stack memory disclosure (into logs and parsing) and stack corruption that can crash the modem RX thread (denial of service). An attacker can remotely impact device operation.
Recommendation
Apply the fix that bounds both scanning loops by out_len to prevent out-of-bounds accesses. Also consider updating the driver to a patched version.
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Original NVD description (English source)
The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV: events in on_cmd_socknotifyev() (drivers/modem/vendor_standalone/wncm14a2a.c). The response line is linearized into a fixed 40-byte stack buffer via net_buf_linearize(), which caps the copy at 39 bytes and returns out_len <= 39. The two quote-delimiter scanning loops, however, were bounded by len — the full CR/LF-delimited frame length returned by net_buf_findcrlf() — rather than by out_len. When a %NOTIFYEV: line longer than 39 bytes contains no " within the linearized region, the loop indices p1/p2 walk past value[39] and read adjacent stack memory until a stray quote byte is found or the index reaches len. The over-read string is then passed to strncmp()/atoi()/LOG_*, and if a quote byte is found out of bounds the subsequent value[p2] = '\0' performs a single-NUL out-of-bounds stack write at an attacker-influenced offset. The %NOTIFYEV: payload carries network-derived content (LTIME network time, SIB1 base-station system information, CSPS/RRCSTATE), so a rogue cellular base station, a malicious or compromised modem module, or RF manipulation that induces an over-long notify line reaches the defect without any application interaction; the handler runs automatically on the unsolicited event in the modem RX thread. The impact is out-of-bounds stack disclosure (into logs and parsing) and stack corruption that can crash the modem RX thread (denial of service). The write offset is only weakly controlled, so memory-safe code execution is not demonstrated. The fix bounds both scanning loops by out_len, keeping all accesses within the linearized buffer.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS