111 lines
6.8 KiB
JSON
111 lines
6.8 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-16664",
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"assignerOrgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
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"state": "PUBLISHED",
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"assignerShortName": "zephyr",
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"dateReserved": "2026-07-22T19:47:54.908Z",
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"datePublished": "2026-11-13T00:23:05.652Z",
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"dateUpdated": "2026-11-13T21:59:26.710Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
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"shortName": "zephyr",
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"dateUpdated": "2026-11-13T21:59:26.710Z"
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},
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"title": "Unchecked serial-recovery image index causes out-of-bounds slot-table read in MCUboot Zephyr port",
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"descriptions": [
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{
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"lang": "en",
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"value": "MCUboot's Zephyr serial-recovery upload handler bs_upload() in boot/boot_serial/src/boot_serial.c decodes the host-supplied image field of an MCUmgr image-upload request into img_num (a full 32-bit value) and latches it on the off == 0 packet without any range check. It then passes img_num straight to flash_area_id_from_multi_image_slot(img_num, 0), which on the Zephyr port resolves to __flash_area_ids_for_slot() in boot/zephyr/include/sysflash/sysflash.h and indexes the static const int all_slots[] table as all_slots[img_num 2]. That table holds only MCUBOOT_IMAGE_NUMBER 2 entries, so any img_num >= MCUBOOT_IMAGE_NUMBER is an out-of-bounds read.\n\nThe path is reachable by anyone with access to the serial / SMP recovery console, which is unauthenticated by design, and the bad value is supplied before any image signature is verified. The defect is specific to the default non-direct upload path (MCUBOOT_SERIAL_DIRECT_IMAGE_UPLOAD disabled) on the Zephyr port with the array-backed slot layout (not CONFIG_SINGLE_APPLICATION_SLOT). It is not gated on a multi-image configuration: MCUBOOT_IMAGE_NUMBER defaults to 1, so even a default single-image build is affected for any image >= 1. The MCUBOOT_SERIAL_DIRECT_IMAGE_UPLOAD path is safe (its flash_area_id_from_direct_image() switch returns -EINVAL for unknown indices).\n\nflash_area_id_from_multi_image_slot() takes a signed int image_index while img_num is uint32_t, so the attacker controls the sign of the index as well as its magnitude: an image of 0xFFFFFFFE converts to -2 and reads all_slots[-4], off the front of the table, while large positive values read off the end (CWE-192). (0xFFFFFFFF itself is the \"no image given\" sentinel and selects image 0.) Either way the index multiply img * 2 is performed in int, so a wild offset yields a bus/hard fault, giving a reliable denial of service of the bootloader during recovery. For moderately out-of-range indices the read returns adjacent .rodata as a garbage flash-area id that is handed to flash_area_open(); this normally fails with MGMT_ERR_EINVAL, but if the garbage id happens to match a valid non-image partition, the subsequent erase/write can target a partition outside the image set (CWE-787). The attacker-supplied value is never echoed back, so there is no information disclosure. The fix is to reject img_num >= BOOT_IMAGE_NUMBER on the off == 0 packet, before the slot lookup. The comparison must be made on the unsigned img_num: an equivalent guard applied after the conversion to int would not reject the negative case above. __flash_area_ids_for_slot() should bounds-check its own arguments as defence in depth.\nThis vulnerability was reported independently twice: by NVIDIA Project Vanessa on 2026-06-22, and by Kai Phan (@kaimandalic) on 2026-07-19 as GHSA-8v33-88p6-jffj, which is closed as a duplicate of this advisory. Both original reports are reproduced in full below."
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}
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],
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"affected": [
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{
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"vendor": "mcu-tools",
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"product": "mcuboot",
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"collectionURL": "https://github.com/mcu-tools/mcuboot",
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"packageName": "mcuboot",
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"defaultStatus": "unaffected",
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"programFiles": [
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"boot/boot_serial/src/boot_serial.c",
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"boot/zephyr/include/sysflash/sysflash.h"
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],
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"programRoutines": [
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{
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"name": "__flash_area_ids_for_slot"
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},
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{
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"name": "bs_upload"
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}
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],
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"versions": [
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{
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"version": "2.0.0",
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"status": "affected",
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"lessThanOrEqual": "*",
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"versionType": "semver"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://github.com/mcu-tools/mcuboot/commit/183a05f256bdbbac86edcb048958da59018f814e",
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"name": "Fix commit 183a05f256bd",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/mcu-tools/mcuboot/commit/b35d623fc44b873cbb244a4fb0930f259ff45eb8",
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"name": "Fix commit b35d623fc44b",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/mcu-tools/mcuboot/commit/f30be48bcc58d18c22e61be914e8f7b380abcf53",
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"name": "Fix commit f30be48bcc58",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/mcu-tools/mcuboot/security/advisories/GHSA-8rcq-2mgr-fhp8",
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"name": "GHSA-8rcq-2mgr-fhp8"
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
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"baseScore": 5.1,
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"baseSeverity": "MEDIUM"
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"description": "bounds",
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"cweId": "CWE-129",
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"type": "CWE"
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}
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]
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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}
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}
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} |