CVE-2026-97587 (GCVE-0-2026-97587)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-10-30 12:37
VLAI
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]
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e9991434596f5373dfd75857b445eb92a9253c56 , < 433249a4de52ecda40ffa9c466cec1312e62826f (git)
Affected: e9991434596f5373dfd75857b445eb92a9253c56 , < 5a1b6379eed5b13eac0228b605b0bed988e547e9 (git)
Affected: e9991434596f5373dfd75857b445eb92a9253c56 , < 143668c424772979a45118dc9cc9c2c13a35f41d (git)
Affected: e9991434596f5373dfd75857b445eb92a9253c56 , < 9bec7beaed074bcae4181fde9ff9dfbe4e7b0957 (git)
Affected: e9991434596f5373dfd75857b445eb92a9253c56 , < e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb (git)
Affected: e9991434596f5373dfd75857b445eb92a9253c56 , < 6809da6e9c08ccc9a09cb0a48c61471679274aaa (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "433249a4de52ecda40ffa9c466cec1312e62826f",
              "status": "affected",
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "versionType": "git"
            },
            {
              "lessThan": "5a1b6379eed5b13eac0228b605b0bed988e547e9",
              "status": "affected",
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "versionType": "git"
            },
            {
              "lessThan": "143668c424772979a45118dc9cc9c2c13a35f41d",
              "status": "affected",
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "versionType": "git"
            },
            {
              "lessThan": "9bec7beaed074bcae4181fde9ff9dfbe4e7b0957",
              "status": "affected",
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "versionType": "git"
            },
            {
              "lessThan": "e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb",
              "status": "affected",
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "versionType": "git"
            },
            {
              "lessThan": "6809da6e9c08ccc9a09cb0a48c61471679274aaa",
              "status": "affected",
              "version": "e9991434596f5373dfd75857b445eb92a9253c56",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-97587",
      "date": "2026-11-12",
      "epss": "0.00206",
      "percentile": "0.10772"
    },
    "microsoft_vex": {
      "current_release_date": "2026-11-07T01:48:25.000Z",
      "cve": "CVE-2026-97587",
      "id": "msrc_CVE-2026-97587",
      "initial_release_date": "2026-09-27T23:23:40.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "perf: RISC-V: store available counter mask as bitmap",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97587.json",
      "version": "5"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "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",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "433249a4de52ecda40ffa9c466cec1312e62826f",
                    "status": "affected",
                    "version": "e9991434596f5373dfd75857b445eb92a9253c56",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5a1b6379eed5b13eac0228b605b0bed988e547e9",
                    "status": "affected",
                    "version": "e9991434596f5373dfd75857b445eb92a9253c56",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "143668c424772979a45118dc9cc9c2c13a35f41d",
                    "status": "affected",
                    "version": "e9991434596f5373dfd75857b445eb92a9253c56",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "9bec7beaed074bcae4181fde9ff9dfbe4e7b0957",
                    "status": "affected",
                    "version": "e9991434596f5373dfd75857b445eb92a9253c56",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb",
                    "status": "affected",
                    "version": "e9991434596f5373dfd75857b445eb92a9253c56",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6809da6e9c08ccc9a09cb0a48c61471679274aaa",
                    "status": "affected",
                    "version": "e9991434596f5373dfd75857b445eb92a9253c56",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "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",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.18"
                  },
                  {
                    "lessThan": "5.18",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.191",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.160",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "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[pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]"
          }
        ],
        "id": "CVE-2026-97587",
        "lastModified": "2026-10-30T13:21:08.840",
        "metrics": {},
        "published": "2026-09-25T11:17:09.880",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T02:31:08+00:00",
      "cve": "CVE-2026-97587",
      "id": "CVE-2026-97587",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "202",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf: RISC-V: store available counter mask as bitmap",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97587.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T18:14:54Z",
      "cve": "CVE-2026-97587",
      "id": "CVE-2026-97587",
      "initial_release_date": "2026-10-01T00:38:55Z",
      "product_status:known_not_affected": "348",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97587",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-97587.json",
      "version": "4"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.