CVE-2026-11743
MediumCVSS 6.6Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
The SF32LB MPI QSPI NOR flash driver has a vulnerability in offset and length validation for read and write operations. Due to signed offset and unsigned size, a negative offset is converted to a large unsigned value and the addition can wrap to a small result that passes the check, allowing access outside the mapped flash window.
Risk Assessment
An attacker with access to the flash device can read arbitrary CPU-addressable memory (confidentiality breach) and write out-of-range flash data or invalidate chosen cache ranges (integrity and availability impact). This affects overall system security.
Recommendation
Update the driver immediately to a version containing the fix that uses qspi_nor_range_is_valid() with overflow-safe 64-bit arithmetic and rejects negative offsets. Additionally, restrict access to the flash device to trusted threads if possible.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS