CVE-2026-97587 (GCVE-0-2026-97587)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-30 12:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: RISC-V: store available counter mask as bitmap The available-counter mask was a single unsigned long, but iteration uses RISCV_MAX_COUNTERS, which is 64. On RV32 that reads past the object. Filling with an unsigned-long bit at index 32 and above is also wrong. Use DECLARE_BITMAP and set_bit/bitmap helpers. Walk each bitmap word into CFG_MATCH when checking events, when allocating an index, and when stopping all counters. Set the counter base to i times BITS_PER_LONG. Share the CFG_MATCH ecall through a small helper so the 32-bit argument split is not duplicated. On qemu-system-riscv32 the probe bitmap has bits above XLEN set, so the first word alone is not enough. [pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]
References
Impacted products
Vendor Product Version
Linux Linux Version: e9991434596f5373dfd75857b445eb92a9253c56
Version: e9991434596f5373dfd75857b445eb92a9253c56
Version: e9991434596f5373dfd75857b445eb92a9253c56
Version: e9991434596f5373dfd75857b445eb92a9253c56
Version: e9991434596f5373dfd75857b445eb92a9253c56
Version: e9991434596f5373dfd75857b445eb92a9253c56
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{
  "containers": {
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          "programFiles": [
            "drivers/perf/riscv_pmu_legacy.c",
            "drivers/perf/riscv_pmu_sbi.c",
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              "version": "0",
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: RISC-V: store available counter mask as bitmap\n\nThe available-counter mask was a single unsigned long, but iteration\nuses RISCV_MAX_COUNTERS, which is 64. On RV32 that reads past the object.\nFilling with an unsigned-long bit at index 32 and above is also wrong.\n\nUse DECLARE_BITMAP and set_bit/bitmap helpers. Walk each bitmap word\ninto CFG_MATCH when checking events, when allocating an index, and when\nstopping all counters. Set the counter base to i times BITS_PER_LONG.\nShare the CFG_MATCH ecall through a small helper so the 32-bit argument\nsplit is not duplicated. On qemu-system-riscv32 the probe bitmap has bits\nabove XLEN set, so the first word alone is not enough.\n\n[pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:37:30.665Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/433249a4de52ecda40ffa9c466cec1312e62826f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a1b6379eed5b13eac0228b605b0bed988e547e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa"
        }
      ],
      "title": "perf: RISC-V: store available counter mask as bitmap",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97587",
    "datePublished": "2026-09-25T10:22:06.177Z",
    "dateReserved": "2026-09-24T16:01:01.157Z",
    "dateUpdated": "2026-10-30T12:37:30.665Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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