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CVE-2026-98034

Estado: RecibidaSin puntuar—

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

bpf: Mark NULL kptr stores precise

check_map_kptr_access() permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it does not mark that register precise.

A state checkpoint reached with an imprecise zero can therefore prune a second path that reaches the store with an arbitrary nonzero scalar. The program can write attacker-controlled bits into the kptr field and load them back as a PTR_TO_BTF_ID.

Call mark_chain_precision() before accepting a known-zero register. This forces state equivalence to compare its scalar range and makes the verifier visit and reject a path carrying a nonzero value.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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).

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-2026-98034",
  "cveTags": [],
  "metrics": {},
  "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": "61df10c7799e27807ad5e459eec9d77cddf8bf45",
              "lessThan": "86168208737bdd267d92d855d453d1d2f840df19",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "61df10c7799e27807ad5e459eec9d77cddf8bf45",
              "lessThan": "ecdc5043794c9184aa8e6c814603899479c46b35",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b5a8069835e5236824a84281592d29f859b33153",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.18.18",
              "lessThan": "5.19",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:32.123",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/86168208737bdd267d92d855d453d1d2f840df19",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ecdc5043794c9184aa8e6c814603899479c46b35",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark NULL kptr stores precise\n\ncheck_map_kptr_access() permits a scalar store into an untrusted kptr\nfield only when the register is known to contain zero. Unlike other\nverifier checks whose outcome depends on a scalar value, it does not mark\nthat register precise.\n\nA state checkpoint reached with an imprecise zero can therefore prune a\nsecond path that reaches the store with an arbitrary nonzero scalar. The\nprogram can write attacker-controlled bits into the kptr field and load\nthem back as a PTR_TO_BTF_ID.\n\nCall mark_chain_precision() before accepting a known-zero register. This\nforces state equivalence to compare its scalar range and makes the verifier\nvisit and reject a path carrying a nonzero value."
    }
  ],
  "lastModified": "2026-09-25T11:17:32.123",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}