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CVE-2026-75084— Out-of-bounds write in the TI CC1200 IEEE 802.15.4 driver from an unvalidated radio-supplied packet length

Quick assessment

Affected
zephyrproject zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： CC1200 子 GHz IEEE 802.15.4 驱动程序在 函数中从无线电接收 FIFO（先进先出缓冲区）的第一个字节获取 PHY 数据包长度，并在 函数中对其进行验证（位于 ）。该验证仅强制执行了下界检查（即 ）；其第二个子句拒绝了包含字节数多于声明值的 FIFO，因此从未对较大值设定上界。由于驱动程序将无线电配置为可变数据包长度模式，且 设置为 ，因此长度字节是一个空中传输（over-the-air）的值 0-255，它会传递给 以及后续的 SPI 突发读取操作，且未受

CVSS 6.8 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 1.11.0≤ 4.4.2 affected
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I. Basic Information for CVE-2026-75084

Vulnerability Information
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Vulnerability Title
Out-of-bounds write in the TI CC1200 IEEE 802.15.4 driver from an unvalidated radio-supplied packet length
Source: CVE Program / CVE List V5
Vulnerability Description
The CC1200 sub-GHz IEEE 802.15.4 driver takes the PHY packet length from the first byte of the radio's RX FIFO in get_packet_length() and validates it in verify_rxfifo_validity() (drivers/ieee802154/ieee802154_cc1200.c). That validation only enforced a lower bound (pkt_len < 3); its second clause rejects a FIFO that holds more bytes than declared and therefore never bounds large values. Because the driver configures the radio for variable packet length with PKT_LEN = 0xFF, the length byte is an over-the-air value of 0-255 that reached net_pkt_rx_alloc_with_buffer() and the subsequent SPI burst read unclamped. An unauthenticated attacker within radio range can transmit a frame that presents a length byte above the IEEE 802.15.4 maximum of 127 while the chip's 128-byte RX FIFO has not overflowed, so the driver's RX_FIFO_ERROR pre-check does not fire. Reaching this state depends on RF framing and timing, since the RX thread is driven off the PKT_SYNC_RXTX signal and may sample the FIFO before a packet is complete; no pairing, authentication, or user interaction is required. With the default CONFIG_NET_BUF_FIXED_DATA_SIZE and CONFIG_NET_BUF_DATA_SIZE=128, an allocation larger than one fragment is satisfied by a chain of fragments, but read_rxfifo_content() performs a single SPI burst of pkt_len bytes into the first fragment's buf->data and then calls net_buf_add() with the same length. A length above 128 therefore writes up to 127 bytes past the end of a fragment in the contiguous rx_bufs pool and leaves a net_buf whose len exceeds its capacity. The overflowing bytes are FIFO-underflow output rather than attacker-chosen data, so the practical impact is network-buffer-pool corruption and crashes rather than a controlled write. Only builds that enable CONFIG_IEEE802154_CC1200 with an attached CC1200 radio are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 1.11.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-75084

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III. Intelligence Information for CVE-2026-75084

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Patches & Fixes for CVE-2026-75084 (1)

Other References for CVE-2026-75084 (1)

Same Patch Batch · zephyrproject · 2026-10-14 · 4 CVEs total

CVE-2026-19673 7.1 HIGH Out-of-bounds read and net_buf length underflow in Zephyr Ethernet L2 when parsing a trunc
CVE-2026-75083 5.9 MEDIUM Integer underflow of the radio-reported frame length causes an out-of-bounds write in the
CVE-2026-75085 4.2 MEDIUM Out-of-bounds read from received-frame length underflow in the STM32WBA IEEE 802.15.4 driv

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-787

V. Comments for CVE-2026-75084

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