perf/core: Check kernel access when kernel callchains are requested

{
  "id": "5e585105ecb40098f63aedfd63d65909ccb4d6d8b8a307d5a9e4f68904b754b0",
  "url": "https://osv.dev/vulnerability/CVE-2026-98937",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "perf/core: Check kernel access when kernel callchains are requested",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: perf/core: Check kernel access when kernel callchains are requested perf_event_open() currently gates perf_allow_kernel() only on !attr.exclude_kernel. However, users can still request kernel callchain collection with attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1. That still requires kernel profiling privilege, but the existing check does not enforce it. Update the permission check to call perf_allow_kernel() when either kernel sampling is requested or kernel callchains are requested. This keeps permission checks aligned with requested data and prevents unprivileged use of kernel callchain capture.",
    "evidence": "osv:CVE-2026-98937",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98937",
      "aliases": [
        "CVE-2026-98937"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "0764771dab80d7b84b9a271bee7f1b21a04a3f0c"
                },
                {
                  "fixed": "132bee76097be421ab3012130b5b506324cf2be1"
                },
                {
                  "fixed": "2581b43e162cfc43e6f5d8dd8d2b38f3441550de"
                },
                {
                  "fixed": "6e187281f978a2bff98ead6aa40f8ddc9a2c9afb"
                },
                {
                  "fixed": "a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98937.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.31"
                },
                {
                  "fixed": "6.12.113"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.56"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98937.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.495648271Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/132bee76097be421ab3012130b5b506324cf2be1",
        "https://git.kernel.org/stable/c/2581b43e162cfc43e6f5d8dd8d2b38f3441550de",
        "https://git.kernel.org/stable/c/6e187281f978a2bff98ead6aa40f8ddc9a2c9afb",
        "https://git.kernel.org/stable/c/a4573a3838ae4fc73b70019cfa1dac9aaea7cc2f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98937.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98937",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98937.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98937",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 512483,
  "published_at": "2026-10-23T12:11:53.327+00:00"
}