CVE-2026-75085
MediumCVSS 4.2Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
The STM32WBA IEEE 802.15.4 driver computed the packet length as the frame length minus the FCS length without first verifying that the reported length could hold an FCS. A reported length of 0 or 1 caused a uint8_t underflow to 254 or 255, and the only bound (__ASSERT_NO_MSG) was compiled out in the default production configuration. As a result, the driver read roughly 128 bytes past the radio receive buffer and copied that adjacent memory into a network packet submitted to the networking stack.
Risk Assessment
The vulnerability allows an attacker within radio range to trigger an out-of-bounds read and potentially disclose adjacent RAM from the device. It may also cause needless oversized packet allocation in the RX thread.
Recommendation
Update to a version containing the fix that rejects frames whose reported length is smaller than IEEE802154_FCS_LENGTH and replaces the compiled-out assertion with a runtime length check. Until patched, limit device exposure to untrusted radio traffic where feasible.
Related vulnerabilities
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Original NVD description (English source)
The STM32WBA IEEE 802.15.4 driver in drivers/ieee802154/ieee802154_stm32wba.c computed the packet length of a received frame as pkt_len = rx_frame->length - IEEE802154_FCS_LENGTH without first checking that the radio-reported length could hold an FCS. pkt_len is a uint8_t, so a reported length of 0 or 1 wrapped to 254 or 255. The only bound on the resulting value was __ASSERT_NO_MSG(pkt_len <= CONFIG_NET_BUF_DATA_SIZE), which compiles to nothing in the default production configuration (CONFIG_ASSERT=n). The length originates in the ST link-layer receive-done metadata (p_metadata->length, stored by stm32wba_802154_receive_done()), and ultimately in the PHY header of a frame received over the air, so it is influenced by any attacker within radio range of the device. Reaching the underflow requires the vendor link layer to surface a frame shorter than the FCS with no error; the driver performed no validation of its own on that value. When the underflow occurs, stm32wba_802154_rx_thread() calls net_pkt_write(pkt, rx_frame->psdu, pkt_len) with a length of about 254 bytes against a receive buffer that holds at most one PHY packet (IEEE802154_MAX_PHY_PACKET_SIZE, 127 bytes). This reads roughly 128 bytes past the end of the radio receive buffer and copies that adjacent memory into a network packet that is submitted to the networking stack, giving an out-of-bounds read with a potential disclosure of adjacent RAM plus needless oversized packet allocation in the RX thread. The fix rejects a frame whose reported length is smaller than IEEE802154_FCS_LENGTH before the subtraction, and replaces the compiled-out assertion with a runtime length check that drops oversized frames — matching the runtime check already present in drivers/ieee802154/ieee802154_nrf5.c.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS