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CVE-2026-92517

Estado: RecibidaSin puntuar—

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

bpf, riscv: Fix extable handling for arena load_acquire

emit_atomic_ld_st() returns 1 to have build_body() skip the zext after a sub-word load_acquire. The caller does "ret = ret ?: add_exception_handler(...)", which skips add_exception_handler() on any non-zero ret, so the extable entry is missing and a faulting PROBE_ATOMIC load_acquire oopses.

REG_DONT_CLEAR_MARKER leaves rd stale on fault, and the verifier still thinks the load overwrote it, so a program can leak it through a map.

Check ret >= 0 before calling add_exception_handler(), and pass rd for LOAD_ACQ so the fault zeroes rd like a PROBE_MEM load. Return ret unchanged for the zext skip.

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-2026-92517",
  "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": "fb7cefabae8117c203155ef169a386bec43bbba9",
              "lessThan": "26d9496c826586338d1b8c27edfec4a19a89f462",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "fb7cefabae8117c203155ef169a386bec43bbba9",
              "lessThan": "08fe2eaa609180c1baeb76c2629a9c82263b0427",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "fb7cefabae8117c203155ef169a386bec43bbba9",
              "lessThan": "5eb8921371c6fd117d4a328b6053dfda38707df8",
              "versionType": "git"
            }
          ],
          "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": "6.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.18",
              "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": "2026-09-17T17:17:54.587",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/08fe2eaa609180c1baeb76c2629a9c82263b0427",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/26d9496c826586338d1b8c27edfec4a19a89f462",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5eb8921371c6fd117d4a328b6053dfda38707df8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, riscv: Fix extable handling for arena load_acquire\n\nemit_atomic_ld_st() returns 1 to have build_body() skip the zext after\na sub-word load_acquire. The caller does \"ret = ret ?:\nadd_exception_handler(...)\", which skips add_exception_handler() on any\nnon-zero ret, so the extable entry is missing and a faulting\nPROBE_ATOMIC load_acquire oopses.\n\nREG_DONT_CLEAR_MARKER leaves rd stale on fault, and the verifier still\nthinks the load overwrote it, so a program can leak it through a map.\n\nCheck ret >= 0 before calling add_exception_handler(), and pass rd for\nLOAD_ACQ so the fault zeroes rd like a PROBE_MEM load. Return ret\nunchanged for the zext skip."
    }
  ],
  "lastModified": "2026-09-17T17:17:54.587",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}