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CVE-2026-9263— Out-of-bounds read in Bluetooth Controller ISOAL framed RX reassembly leaks adjacent memory into host HCI ISO packets

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.

zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr 3.3.0版本至4.5.0之前版本存在缓冲区错误漏洞，该漏洞源于蓝牙控制器ISO适配层未能验证帧ISO PDU起始段长度字段，可能导致远程攻击者触发越界读取，造成信息泄露和潜在拒绝服务攻击。

CVSS 6.5 · Medium EPSS 0.33% · P24

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 3.3.0< 4.5.0 affected
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I. Basic Information for CVE-2026-9263

Vulnerability Information
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Vulnerability Title
Out-of-bounds read in Bluetooth Controller ISOAL framed RX reassembly leaks adjacent memory into host HCI ISO packets
Source: CVE Program / CVE List V5
Vulnerability Description
The Zephyr Bluetooth controller ISO Adaptation Layer (subsys/bluetooth/controller/ll_sw/isoal.c) fails to validate the length field of a framed ISO PDU start segment. Per the Bluetooth specification a start segment (sc=0) always carries a 3-byte time_offset, so its segment-header len must be at least PDU_ISO_SEG_TIMEOFFSET_SIZE (3). isoal_check_seg_header() accepted start segments with len < 3 as valid, and isoal_rx_framed_consume() then computed length = seg_hdr->len - 3 in a uint8_t, underflowing to 253-255 when len is 0-2. That oversized length is passed to isoal_rx_append_to_sdu(), whose copy is clamped only against the destination SDU buffer size, not the source PDU length, so up to ~255 bytes of controller memory beyond the received PDU are copied (via sink_sdu_write_hci()/net_buf_add_mem) into an HCI ISO data packet and delivered to the host. The PDU and its segment headers are entirely attacker-controlled and arrive over the air, reachable through both the CIS and BIS-sync HCI data paths (hci_driver.c) and the vendor data path (ull_iso.c), so a remote CIS peer or a broadcaster the device is synced to can trigger an out-of-bounds read causing information disclosure to the host and potential denial of service (faults or malformed oversized HCI ISO packets). The flaw affects all Zephyr releases since framed ISO reception was introduced in v3.0.0. The fix rejects sc=0 segments with len < 3 in isoal_check_seg_header() and adds a guard before the subtraction in isoal_rx_framed_consume().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr 3.3.0版本至4.5.0之前版本存在缓冲区错误漏洞，该漏洞源于蓝牙控制器ISO适配层未能验证帧ISO PDU起始段长度字段，可能导致远程攻击者触发越界读取，造成信息泄露和潜在拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 3.3.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-9263

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III. Intelligence Information for CVE-2026-9263

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Patches & Fixes for CVE-2026-9263 (1)

Vendor Advisories for CVE-2026-9263 (1)

Same Patch Batch · zephyrproject · 2026-06-30 · 5 CVEs total

CVE-2026-10655 6.5 MEDIUM Use-after-free race in SNTP async client when closing the socket while the socket service
CVE-2026-10653 6.4 MEDIUM Non-atomic `net_buf` reference counts cause double-free / free-list corruption under concu
CVE-2026-10652 4.8 MEDIUM Out-of-bounds read in Zephyr DNS resolver TXT/SRV record parsing (unvalidated `rdlength`)
CVE-2026-10654 3.1 LOW RFCOMM session-disconnect race leaks session/L2CAP and denies further RFCOMM service in Ze

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-125

V. Comments for CVE-2026-9263

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