{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "tools/perf/util/event.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b9e8406651dcc1c19238aad11861a758683525b4",
              "status": "affected",
              "version": "0c4c4debb0adda4c18c158d95031dc2b9f637869",
              "versionType": "git"
            },
            {
              "lessThan": "eb266a14c16a93eb4db7b56a452d6be93f8bdcd4",
              "status": "affected",
              "version": "0c4c4debb0adda4c18c158d95031dc2b9f637869",
              "versionType": "git"
            },
            {
              "lessThan": "5484b43a0ec8231c36fba6ead654cb72dbba8b8f",
              "status": "affected",
              "version": "0c4c4debb0adda4c18c158d95031dc2b9f637869",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "tools/perf/util/event.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf tools: Use perf_env__get_cpu_topology() in machine__resolve()\n\nmachine__resolve() accesses env-\u003ecpu[al-\u003ecpu].socket_id after checking\nal-\u003ecpu \u003e= 0 and env-\u003ecpu != NULL, but without validating al-\u003ecpu\nagainst env-\u003enr_cpus_avail.  Since al-\u003ecpu comes from the untrusted\nperf.data sample, a crafted file with a large CPU index causes an\nout-of-bounds heap read.\n\nUse perf_env__get_cpu_topology() which validates both NULL and bounds.\nAlso bounds-check al-\u003ecpu before the cast to struct perf_cpu (int16_t):\nwithout this, values like 65536 silently truncate to 0, bypassing the\naccessor\u0027s internal check and returning CPU 0\u0027s topology."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - machine__resolve() is reached when perf tools parse untrusted perf.data samples via perf report/script/mem/kvm/diff and related builtins; recordings are routinely ingested over the network through stdin pipes (perf -i -) or automated CI/profiling services that analyze uploaded artifacts, giving a remote attacker a network path to supply the malicious CPU index.\nAC:L - The attacker fully controls sample.cpu in the crafted perf.data PERF_RECORD_SAMPLE payload; once perf opens the file or pipe, a single sample with cpu \u003e= nr_cpus_avail deterministically triggers the out-of-bounds read without races, timing, or uncontrollable memory layout.\nPR:N - Processing malicious perf.data requires no Linux capabilities or init-namespace root; any remote party who can supply a recording to a profiling pipeline, bug-report workflow, or piped perf session can trigger the bug on the analyzing host without local account privileges on that system.\nUI:N - No interactive victim action beyond normal automated ingestion of perf recordings is required; an attacker can deliver a crafted file to CI bots, shared profiling servers, or piped analysis sessions that invoke perf non-interactively, without the analyst manually opening attachments.\nS:U - The flaw is confined to the userspace perf tool process parsing the recording; impact does not cross VM, IOMMU, or container/kernel security boundaries and remains within the same security authority as the perf analyzer process.\nC:H - The bug is an attacker-controlled out-of-bounds heap read through env-\u003ecpu[al-\u003ecpu].socket_id with no upper bound on the index relative to the allocated topology array, enabling disclosure of adjacent heap contents (metadata, pointers, strings) from the perf process address space.\nI:N - The vulnerability performs only an out-of-bounds read of topology fields into al-\u003esocket; it does not write memory, corrupt heap metadata, or provide a direct arbitrary-write or code-execution primitive in the vulnerable code path.\nA:H - An out-of-bounds heap read with a large crafted CPU index commonly causes an immediate SIGSEGV or abort of the perf analysis process, denying availability of profiling, CI performance triage, and incident-response workflows that depend on perf report/script completing successfully."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:56.727Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4"
        },
        {
          "url": "https://git.kernel.org/stable/c/5484b43a0ec8231c36fba6ead654cb72dbba8b8f"
        }
      ],
      "title": "perf tools: Use perf_env__get_cpu_topology() in machine__resolve()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80670",
    "datePublished": "2026-08-28T06:49:11.120Z",
    "dateReserved": "2026-08-26T14:34:25.782Z",
    "dateUpdated": "2026-08-29T06:21:56.727Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}