bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

{
  "id": "baa7adfc5bfdaf15266fc4b35898a2abb8cedb477d3756f9439163806cd87231",
  "url": "https://osv.dev/vulnerability/CVE-2024-56768",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP On x86-64 calling bpf_get_smp_processor_id() in a kernel with CONFIG_SMP disabled can trigger the following bug, as pcpu_hot is unavailable: [ 8.471774] BUG: unable to handle page fault for address: 00000000936a290c [ 8.471849] #PF: supervisor read access in kernel mode [ 8.471881] #PF: error_code(0x0000) - not-present page Fix by inlining a return 0 in the !CONFIG_SMP case.",
    "evidence": "osv:CVE-2024-56768",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-56768",
      "aliases": [
        "CVE-2024-56768"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1ae6921009e5d72787e07ccc04754514ccf6bc99"
                },
                {
                  "fixed": "f4ab7d74247b0150547cf909b3f6f24ee85183df"
                },
                {
                  "fixed": "23579010cf0a12476e96a5f1acdf78a9c5843657"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56768.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.12.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56768.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.198763101Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/23579010cf0a12476e96a5f1acdf78a9c5843657",
        "https://git.kernel.org/stable/c/f4ab7d74247b0150547cf909b3f6f24ee85183df",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56768.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56768",
        "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/2024/56xxx/CVE-2024-56768.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-56768",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501230,
  "published_at": "2025-01-06T16:20:46.133+00:00"
}