CVE-2026-97587

Full vulnerability record from the local CVENow database.

Description

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. [[email protected]: updated to apply; fixed checkpatch.pl issues]

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-25 11:17:09.880000

Last modified

2026-10-30 13:21:08.840000

View original CVE JSON

{
  "id": "CVE-2026-97587",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:09.880",
  "lastModified": "2026-10-30T13:21:08.840",
  "vulnStatus": "Received",
  "cveTags": [],
  "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[[email protected]: updated to apply; fixed checkpatch.pl issues]"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/perf/riscv_pmu_legacy.c",
            "drivers/perf/riscv_pmu_sbi.c",
            "include/linux/perf/riscv_pmu.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "lessThan": "433249a4de52ecda40ffa9c466cec1312e62826f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "lessThan": "5a1b6379eed5b13eac0228b605b0bed988e547e9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "lessThan": "143668c424772979a45118dc9cc9c2c13a35f41d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "lessThan": "9bec7beaed074bcae4181fde9ff9dfbe4e7b0957",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "lessThan": "e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "lessThan": "6809da6e9c08ccc9a09cb0a48c61471679274aaa",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/perf/riscv_pmu_legacy.c",
            "drivers/perf/riscv_pmu_sbi.c",
            "include/linux/perf/riscv_pmu.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.18",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.111",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.7",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/143668c424772979a45118dc9cc9c2c13a35f41d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/433249a4de52ecda40ffa9c466cec1312e62826f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5a1b6379eed5b13eac0228b605b0bed988e547e9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6809da6e9c08ccc9a09cb0a48c61471679274aaa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9bec7beaed074bcae4181fde9ff9dfbe4e7b0957",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}