CVE-2026-10682

{
  "id": "CVE-2026-10682",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-27T19:17:14.070",
  "lastModified": "2026-10-24T13:10:00.147",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The userspace verifier z_vrfy_log_filter_set() for the log_filter_set syscall in subsys/logging/log_mgmt.c performed a signed comparison against the int16_t src_id parameter: src_id < (int16_t)log_src_cnt_get(domain_id). Any negative value for src_id (e.g. -1) trivially satisfied this check and was forwarded into z_impl_log_filter_set, where it propagated to filter_set() and ultimately to get_dynamic_filter(), which uses source_id as an unsigned index into the linker-section array &TYPE_SECTION_START(log_dynamic)[source_id].filters.\n\nAfter implicit conversion through uint32_t, an int16_t -1 becomes 0xFFFFFFFF, indexing log_dynamic far out of bounds and causing the kernel to perform an OOB read and an OOB read-modify-write (LOG_FILTER_SLOT_GET/SET) against memory adjacent to the log_dynamic section.\n\nThe written value is a constrained 3-bit log level slot within the targeted 32-bit word, but the target address is attacker-chosen (a small negative offset from log_dynamic) and the write occurs in supervisor mode following a syscall from an unprivileged user thread, providing a kernel memory-corruption / privilege-escalation primitive.\n\nThe defect is reachable on any build with CONFIG_USERSPACE=y and CONFIG_LOG_RUNTIME_FILTERING=y. Present from Zephyr v3.3.0 through v4.4.1. The fix replaces the signed bound check with an unsigned comparison: (uint32_t)src_id < log_src_cnt_get(domain_id), which correctly rejects negative inputs."
    },
    {
      "lang": "es",
      "value": "El verificador de espacio de usuario z_vrfy_log_filter_set() para la llamada al sistema log_filter_set en subsys/logging/log_mgmt.c realizó una comparación con signo contra el parámetro int16_t src_id: src_id < (int16_t)log_src_cnt_get(domain_id). Cualquier valor negativo para src_id (p. ej., -1) satisfizo trivialmente esta verificación y fue reenviado a z_impl_log_filter_set, donde se propagó a filter_set() y finalmente a get_dynamic_filter(), que utiliza source_id como un índice sin signo en el array de sección del enlazador &TYPE_SECTION_START(log_dynamic)[source_id].filters.\n\nDespués de la conversión implícita a través de uint32_t, un int16_t -1 se convierte en 0xFFFFFFFF, indexando log_dynamic muy fuera de los límites y causando que el kernel realice una lectura fuera de límites y una lectura-modificación-escritura fuera de límites (LOG_FILTER_SLOT_GET/SET) contra la memoria adyacente a la sección log_dynamic.\n\nEl valor escrito es una ranura de nivel de registro de 3 bits restringida dentro de la palabra de 32 bits objetivo, pero la dirección objetivo es elegida por el atacante (un pequeño desplazamiento negativo desde log_dynamic) y la escritura ocurre en modo supervisor después de una llamada al sistema de un hilo de usuario sin privilegios, proporcionando una primitiva de corrupción de memoria del kernel / escalada de privilegios.\n\nEl defecto es alcanzable en cualquier compilación con CONFIG_USERSPACE=y y CONFIG_LOG_RUNTIME_FILTERING=y. Presente desde Zephyr v3.3.0 hasta v4.4.1. La solución reemplaza la verificación de límites con signo con una comparación sin signo: (uint32_t)src_id < log_src_cnt_get(domain_id), que rechaza correctamente las entradas negativas."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zephyrproject",
          "product": "zephyr",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
          "packageName": "zephyr",
          "programFiles": [
            "subsys/logging/log_mgmt.c"
          ],
          "versions": [
            {
              "version": "3.0.0",
              "lessThan": "4.3.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "4.4.0",
              "lessThan": "4.4.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H",
          "baseScore": 6.6,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 4.7
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-27T19:00:11.037814Z",
          "id": "CVE-2026-10682",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "3.0.0",
              "versionEndExcluding": "4.5.0",
              "matchCriteriaId": "9E51E7D9-61B6-4A4C-9745-001959AEE652"
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  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/56a15114c6acbab2067fe406dc3adda8608f3def",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6vqh-mg7h-58qh",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ]
    }
  ]
}