GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-80670 (GCVE-0-2026-80670)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:49 – Updated: 2026-08-29 06:21
VLAI
Title
perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
Summary
In the Linux kernel, the following vulnerability has been resolved: perf tools: Use perf_env__get_cpu_topology() in machine__resolve() machine__resolve() accesses env->cpu[al->cpu].socket_id after checking al->cpu >= 0 and env->cpu != NULL, but without validating al->cpu against env->nr_cpus_avail. Since al->cpu comes from the untrusted perf.data sample, a crafted file with a large CPU index causes an out-of-bounds heap read. Use perf_env__get_cpu_topology() which validates both NULL and bounds. Also bounds-check al->cpu before the cast to struct perf_cpu (int16_t): without this, values like 65536 silently truncate to 0, bypassing the accessor's internal check and returning CPU 0's topology.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0c4c4debb0adda4c18c158d95031dc2b9f637869 , < b9e8406651dcc1c19238aad11861a758683525b4 (git)
Affected: 0c4c4debb0adda4c18c158d95031dc2b9f637869 , < eb266a14c16a93eb4db7b56a452d6be93f8bdcd4 (git)
Affected: 0c4c4debb0adda4c18c158d95031dc2b9f637869 , < 5484b43a0ec8231c36fba6ead654cb72dbba8b8f (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (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": [
            "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80670",
      "date": "2026-09-17",
      "epss": "0.00475",
      "percentile": "0.40069"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-29T01:04:12.000Z",
      "cve": "CVE-2026-80670",
      "id": "msrc_CVE-2026-80670",
      "initial_release_date": "2026-08-29T01:04:12.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "perf tools: Use perf_env__get_cpu_topology() in machine__resolve()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80670.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80670\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:52.317\",\"lastModified\":\"2026-08-29T07:16:49.340\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"tools/perf/util/event.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0c4c4debb0adda4c18c158d95031dc2b9f637869\",\"lessThan\":\"b9e8406651dcc1c19238aad11861a758683525b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0c4c4debb0adda4c18c158d95031dc2b9f637869\",\"lessThan\":\"eb266a14c16a93eb4db7b56a452d6be93f8bdcd4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0c4c4debb0adda4c18c158d95031dc2b9f637869\",\"lessThan\":\"5484b43a0ec8231c36fba6ead654cb72dbba8b8f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"tools/perf/util/event.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5484b43a0ec8231c36fba6ead654cb72dbba8b8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T10:04:41+00:00",
      "cve": "CVE-2026-80670",
      "id": "CVE-2026-80670",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf tools: Use perf_env__get_cpu_topology() in machine__resolve()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80670.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:10:00Z",
      "cve": "CVE-2026-80670",
      "id": "CVE-2026-80670",
      "initial_release_date": "2026-08-28T16:34:38Z",
      "product_status:known_affected": "349",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80670",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80670.json",
      "version": "8"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.