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CVE-2026-72154

Estado: RecibidaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

openrisc: Fix jump_label smp syncing

The original commit 8c30b0018f9d ("openrisc: Add jump label support") copies from arm64 and does not properly consider how icache invalidation on remote cores works in OpenRISC. On OpenRISC remote icaches need to be invalidated otherwise static key's may remain state after updating.

Fix SMP cache syncing by:

To test this I first reproduced the issue using a custom test module [0]. The test confirmed that some icache lines maintained stale static_key code sequences after calling static_branch_enable(). After this patch there are no longer jump_label coherency issues.

Leer descripción completaMostrar menos

[0] https://github.com/stffrdhrn/or1k-utils/tree/master/tests/smp_static_key_test

Detalles técnicos trazas, registros y código del informe original
 1. Properly invalidate remote core icaches on SMP systems by using
    icache_all_inv.  The old code uses kick_all_cpus_sync() which runs a
    no-op IPI function call on remote CPU's which does execute a lot of
    code and flushes many cache lines in the process, but does not flush
    all and it's not correct on OpenRISC.
 2. For architectures that do not have WRITETHROUGH caches be sure
    to flush the dcache after patching.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local en kernel Linux (AV:L, PR:L) sin interacción del usuario que afecta sincronización de jump labels en SMP; permite ejecución de código con privilegios elevados tras la invalidación impropia de icache.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-72154",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "8c30b0018f9d93391573e091960d257fd9de120a",
              "lessThan": "3fac46068fe4cea22ed373432b9173a915e8e60d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8c30b0018f9d93391573e091960d257fd9de120a",
              "lessThan": "57740658042daf591c57d6e700d9a304d5972552",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8c30b0018f9d93391573e091960d257fd9de120a",
              "lessThan": "aca063c9024522e4e5b9a9d1927433f6a01785a3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/openrisc/kernel/jump_label.c",
            "arch/openrisc/kernel/patching.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/openrisc/kernel/jump_label.c",
            "arch/openrisc/kernel/patching.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:33.153",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3fac46068fe4cea22ed373432b9173a915e8e60d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/57740658042daf591c57d6e700d9a304d5972552",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aca063c9024522e4e5b9a9d1927433f6a01785a3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenrisc: Fix jump_label smp syncing\n\nThe original commit 8c30b0018f9d (\"openrisc: Add jump label support\")\ncopies from arm64 and does not properly consider how icache invalidation\non remote cores works in OpenRISC.  On OpenRISC remote icaches need to\nbe invalidated otherwise static key's may remain state after updating.\n\nFix SMP cache syncing by:\n\n 1. Properly invalidate remote core icaches on SMP systems by using\n    icache_all_inv.  The old code uses kick_all_cpus_sync() which runs a\n    no-op IPI function call on remote CPU's which does execute a lot of\n    code and flushes many cache lines in the process, but does not flush\n    all and it's not correct on OpenRISC.\n 2. For architectures that do not have WRITETHROUGH caches be sure\n    to flush the dcache after patching.\n\nTo test this I first reproduced the issue using a custom test module\n[0].  The test confirmed that some icache lines maintained stale\nstatic_key code sequences after calling static_branch_enable().  After\nthis patch there are no longer jump_label coherency issues.\n\n[0] https://github.com/stffrdhrn/or1k-utils/tree/master/tests/smp_static_key_test"
    }
  ],
  "lastModified": "2026-08-17T06:18:15.603",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}