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CVE-2026-11743— Missing negative-offset/overflow check in SF32LB MPI QSPI NOR flash driver allows out-of-bounds read and write

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。 zephyrproject zephyr 4.3.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于SF32LB MPI QSPI NOR flash驱动在读写路径对flash偏移和长度验证不当，偏移为有符号整数而长度为无符号整数，负偏移转换后加法回绕绕过检查，导致越界访问内存，可能造成未授权读取内存、影响完整性和可用性。

CVSS 6.6 · Medium EPSS 0.15% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 4.3.0< 4.4.2 affected
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I. Basic Information for CVE-2026-11743

Vulnerability Information
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Vulnerability Title
Missing negative-offset/overflow check in SF32LB MPI QSPI NOR flash driver allows out-of-bounds read and write
Source: CVE Program / CVE List V5
Vulnerability Description
The SF32LB MPI QSPI NOR flash driver (drivers/flash/flash_sf32lb_mpi_qspi_nor.c) validated the flash offset and length on its read and write paths with the test (offset + size) > data->size. Because offset is a signed off_t while size is unsigned, a negative offset is converted to a large unsigned value and the addition can wrap to a small result that passes the check. The read path then performs memcpy(dst, (void *)(data->base + offset), size) and the write path programs flash at offset and cache-invalidates data->base + offset, in both cases accessing memory outside the mapped flash window. The driver's erase path already rejected negative offsets, but read and write did not. In builds with CONFIG_USERSPACE, flash_read and flash_write are syscalls whose verifiers validate the device object and the caller's buffer but deliberately delegate offset bounds checking to the driver. An unprivileged thread that has been granted access to this flash device can therefore call the syscall with a crafted negative offset and a buffer valid in its own memory domain, and reach the unchecked access. The most direct impact is on the read path: by choosing a negative offset and matching size, an attacker slides the memcpy source below the flash base and copies arbitrary CPU-addressable memory into its own buffer, disclosing memory it is not authorized to read. The write path additionally allows programming flash at an out-of-range address and invalidating an attacker-chosen cache range, affecting integrity and availability. Reachability requires userspace to be enabled and the raw flash device object to be granted to an untrusted thread. The fix replaces the check with qspi_nor_range_is_valid(), which rejects negative offsets and performs the bound comparison in overflow-safe 64-bit arithmetic on both paths, and additionally adds an SRAM DMA bounce buffer plus source/destination overlap rejection to prevent a separate DMA bus-hang condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
zephyrproject 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。 zephyrproject zephyr 4.3.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于SF32LB MPI QSPI NOR flash驱动在读写路径对flash偏移和长度验证不当，偏移为有符号整数而长度为无符号整数，负偏移转换后加法回绕绕过检查，导致越界访问内存，可能造成未授权读取内存、影响完整性和可用性。
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 4.3.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-11743

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III. Intelligence Information for CVE-2026-11743

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Patches & Fixes for CVE-2026-11743 (1)

Vendor Advisories for CVE-2026-11743 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-11743

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