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CVE-2026-89906

Estado: RecibidaAlta (7.8)—

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

LoongArch: BPF: Refactor jump offset calculation in tail call

The old macro-based jmp_offset calculation derives the jump distance from a stale prior-pass code stride, which can lead to wrong branch offsets and soft lockups under extra JIT passes.

Fix this by calculating the offset directly on the absolute target: "ctx->offset[insn + 1] - ctx->idx".

To avoid a false 16-bit range check abort during size estimation, add a "ctx->image == NULL" guard to inject a safe dummy offset.

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 de escalada local en kernel LoongArch BPF que causa soft lockups (DoS) por cálculo incorrecto de offsets en tail calls; AV:L PR:L confirma acceso local necesario.

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 ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

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)

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{
  "id": "CVE-2026-89906",
  "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": "cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3",
              "lessThan": "882b8912b7e92341fdb115ba0e2e5142a28684ff",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3",
              "lessThan": "96f44d493c280ea161569c43d7ed0f3b0815803a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3",
              "lessThan": "37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1a782fa32e644aa9fbae6c8488f3e61221ac96e1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "17c010fe45def335fe03a0718935416b04c7f349",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f83d469e16bb1f75991ca67c56786fb2aaa42bea",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9262e3e04621558e875eb5afb5e726b648cd5949",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.1.149",
              "lessThan": "6.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.6.103",
              "lessThan": "6.7",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.43",
              "lessThan": "6.13",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.15.11",
              "lessThan": "6.16",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.16.2",
              "lessThan": "6.17",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "arch/loongarch/net/bpf_jit.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/loongarch/net/bpf_jit.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:16:59.590",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/882b8912b7e92341fdb115ba0e2e5142a28684ff",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/96f44d493c280ea161569c43d7ed0f3b0815803a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Refactor jump offset calculation in tail call\n\nThe old macro-based jmp_offset calculation derives the jump distance\nfrom a stale prior-pass code stride, which can lead to wrong branch\noffsets and soft lockups under extra JIT passes.\n\nFix this by calculating the offset directly on the absolute target:\n\"ctx->offset[insn + 1] - ctx->idx\".\n\nTo avoid a false 16-bit range check abort during size estimation, add\na \"ctx->image == NULL\" guard to inject a safe dummy offset."
    }
  ],
  "lastModified": "2026-09-16T15:18:16.683",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}