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perf: RISC-V: store available counter mask as bitmap

Type: advisorySources: OSV

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]

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.191, 6.12.111, 6.18.53, 6.6.160, 7.2.7
CVEs
CVE-2026-97587
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 10:52 UTC · Revision 1

Source evidence

perf: RISC-V: store available counter mask as bitmap

core-osv · Original source

Published 25 Sept 2026, 10:22 UTC

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]

osv:CVE-2026-97587

Kernel

Fixed versions: 6.1.191, 6.6.160, 6.12.111, 6.18.53, 7.2.7

Complete source record
{
  "id": "481c348e2cf32eff98760f1cd5b11f15a3e397e5564cab64d3ae86a572820221",
  "url": "https://osv.dev/vulnerability/CVE-2026-97587",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "perf: RISC-V: store available counter mask as bitmap",
    "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]",
    "evidence": "osv:CVE-2026-97587",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-97587",
      "aliases": [
        "CVE-2026-97587"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e9991434596f5373dfd75857b445eb92a9253c56"
                },
                {
                  "fixed": "433249a4de52ecda40ffa9c466cec1312e62826f"
                },
                {
                  "fixed": "5a1b6379eed5b13eac0228b605b0bed988e547e9"
                },
                {
                  "fixed": "143668c424772979a45118dc9cc9c2c13a35f41d"
                },
                {
                  "fixed": "9bec7beaed074bcae4181fde9ff9dfbe4e7b0957"
                },
                {
                  "fixed": "e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb"
                },
                {
                  "fixed": "6809da6e9c08ccc9a09cb0a48c61471679274aaa"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97587.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.18.0"
                },
                {
                  "fixed": "6.1.191"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97587.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:52.750962867Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d",
        "https://git.kernel.org/stable/c/433249a4de52ecda40ffa9c466cec1312e62826f",
        "https://git.kernel.org/stable/c/5a1b6379eed5b13eac0228b605b0bed988e547e9",
        "https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa",
        "https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957",
        "https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97587.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-97587",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97587.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-97587",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519055,
  "published_at": "2026-09-25T10:22:06.177+00:00"
}