{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0c4c4debb0adda4c18c158d95031dc2b9f637869"
            },
            {
              "fixed": "b9e8406651dcc1c19238aad11861a758683525b4"
            },
            {
              "fixed": "eb266a14c16a93eb4db7b56a452d6be93f8bdcd4"
            },
            {
              "fixed": "5484b43a0ec8231c36fba6ead654cb72dbba8b8f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.4.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80670.json"
  },
  "details": "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's internal check and returning CPU 0's topology.",
  "id": "CVE-2026-80670",
  "modified": "2026-08-30T03:30:36.788430986Z",
  "published": "2026-08-28T06:49:11.120Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5484b43a0ec8231c36fba6ead654cb72dbba8b8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80670.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80670"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "perf tools: Use perf_env__get_cpu_topology() in machine__resolve()"
}