fprobe: Fix unregister_fprobe() to wait for RCU grace period

{
  "id": "db6fbf3da12e6c4eb6f6c1d7c5b03e29e925994b65fed8684f6d5be061ed1fd0",
  "url": "https://osv.dev/vulnerability/CVE-2026-64075",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fprobe: Fix unregister_fprobe() to wait for RCU grace period",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fprobe: Fix unregister_fprobe() to wait for RCU grace period Commit 4346ba1604093 (\"fprobe: Rewrite fprobe on function-graph tracer\") changed fprobe to register struct fprobe to an rcu-hlist, but it forgot to wait for RCU GP. Thus there can be use-after-free if the fprobe is released right after unregistering. This can be happened on fprobe event and sample module code. To fix this issue, add synchronize_rcu() in unregister_fprobe(). Note that BPF is OK because fprobe is used as a part of bpf_kprobe_multi_link. This unregisters its fprobe in bpf_kprobe_multi_link_release() and it is deallocated via bpf_kprobe_multi_link_dealloc(), which is invoked from bpf_link_defer_dealloc_rcu_gp() RCU callback. For BPF, this also introduced unregister_fprobe_async() which does NOT wait for RCU grace priod.",
    "evidence": "osv:CVE-2026-64075",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64075",
      "aliases": [
        "CVE-2026-64075"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4346ba1604093305a287e08eb465a9c15ba05b80"
                },
                {
                  "fixed": "56b4cfcf1518245493c60fd39c56978f508f1816"
                },
                {
                  "fixed": "a4f6a9005ed6cfd360ef2520430927f05f92ffb0"
                },
                {
                  "fixed": "657b594b2084b39a4bc6d8493aa2140cb00cea49"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64075.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.18.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64075.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.802279316Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/56b4cfcf1518245493c60fd39c56978f508f1816",
        "https://git.kernel.org/stable/c/657b594b2084b39a4bc6d8493aa2140cb00cea49",
        "https://git.kernel.org/stable/c/a4f6a9005ed6cfd360ef2520430927f05f92ffb0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64075.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64075",
        "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/2026/64xxx/CVE-2026-64075.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64075",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 513558,
  "published_at": "2026-07-19T15:39:49.679+00:00"
}