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CVE-2026-92518

Estado: RecibidaAlta (7.8)—

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

riscv, bpf: Fix kernel stack corruption in tailcall with CFI

When CONFIG_CFI_CLANG is enabled, prog->bpf_func already skips the kcfi instruction during setup. Including it again in the tailcall jump offset causes it to jump over an extra 4 bytes, skipping the stack pointer adjustment, which will result in kernel stack corruption.

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) que corrompe stack mediante salto incorrecto en tailcall con CFI, permitiendo escalada de privilegios y potencial DoS o corrupción de memoria.

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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

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-2026-92518",
  "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": "30a59cc79754fd9ff3f41b7ee2eb21da85988548",
              "lessThan": "34b1bb33a025787e05f966e74de18cd36276f801",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "30a59cc79754fd9ff3f41b7ee2eb21da85988548",
              "lessThan": "a6e11a81da3420fd37f1518d4f238c4d5784086e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "30a59cc79754fd9ff3f41b7ee2eb21da85988548",
              "lessThan": "52fb1756ea1d2759dfef2d86245be00b05dac3a2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "fe5b68fdcec0f3d97a32f4c4acfef59cf90718f7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.11.6",
              "lessThan": "6.12",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "arch/riscv/net/bpf_jit_comp64.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/riscv/net/bpf_jit_comp64.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:54.687",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/34b1bb33a025787e05f966e74de18cd36276f801",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/52fb1756ea1d2759dfef2d86245be00b05dac3a2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a6e11a81da3420fd37f1518d4f238c4d5784086e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv, bpf: Fix kernel stack corruption in tailcall with CFI\n\nWhen CONFIG_CFI_CLANG is enabled, prog->bpf_func already skips the kcfi\ninstruction during setup. Including it again in the tailcall jump offset\ncauses it to jump over an extra 4 bytes, skipping the stack pointer\nadjustment, which will result in kernel stack corruption."
    }
  ],
  "lastModified": "2026-09-18T18:18:13.997",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}