zephyrproject Zephyr up to 4.4.x Dhara Flash Translation Layer Disk Driver drivers/disk/ftl_dhara.c dhara_nand_read null pointer dereference

Summaryinfo

A vulnerability categorized as critical has been discovered in zephyrproject Zephyr up to 4.4.x. The impacted element is the function dhara_nand_read of the file drivers/disk/ftl_dhara.c of the component Dhara Flash Translation Layer Disk Driver. Executing a manipulation can lead to null pointer dereference. This vulnerability is handled as CVE-2026-10659. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in zephyrproject Zephyr up to 4.4.x and classified as critical. This vulnerability affects the function dhara_nand_read of the file drivers/disk/ftl_dhara.c of the component Dhara Flash Translation Layer Disk Driver. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

The Dhara flash translation layer disk driver (drivers/disk/ftl_dhara.c) implemented the dhara_nand_ callbacks so that, on a flash error, the error code was written unconditionally through the caller-supplied dhara_error_t err pointer (e.g. *err = DHARA_E_ECC in dhara_nand_read, and similar in dhara_nand_erase/prog/copy). The upstream Dhara library calls these callbacks with err == NULL along its journal-resume binary search: find_last_checkblock() invokes find_checkblock(j, mid, &found, NULL), which forwards the NULL pointer into dhara_nand_read(). This path runs during disk_ftl_access_init() -> dhara_map_resume() whenever the FTL disk is mounted/initialised. If a flash read error (uncorrectable ECC, bad block, controller error) occurs on one of the probed checkpoint pages, the driver dereferences and writes to NULL, faulting the kernel (denial of service). The trigger is conditioned on the NAND medium content/health, which can be influenced by media wear, induced faults, or a corrupted/crafted on-flash image. The fix routes all error assignments through the library's NULL-safe dhara_set_error() helper. Affects Zephyr v4.4.0, where the driver was introduced.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-10659 since 06/02/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 4.5.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• zephyrproject

Name

• Zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4

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CPE 2.2info

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