class: fix use-after-free in class_register()

{
  "id": "b88cda1d014d11db0f51a641ff171d894b12b0a3b4b85feddfa1ec074347a5a2",
  "url": "https://osv.dev/vulnerability/CVE-2023-52468",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "class: fix use-after-free in class_register()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: class: fix use-after-free in class_register() The lock_class_key is still registered and can be found in lock_keys_hash hlist after subsys_private is freed in error handler path.A task who iterate over the lock_keys_hash later may cause use-after-free.So fix that up and unregister the lock_class_key before kfree(cp). On our platform, a driver fails to kset_register because of creating duplicate filename '/class/xxx'.With Kasan enabled, it prints a invalid-access bug report. KASAN bug report: BUG: KASAN: invalid-access in lockdep_register_key+0x19c/0x1bc Write of size 8 at addr 15ffff808b8c0368 by task modprobe/252 Pointer tag: [15], memory tag: [fe] CPU: 7 PID: 252 Comm: modprobe Tainted: G W 6.6.0-mainline-maybe-dirty #1 Call trace: dump_backtrace+0x1b0/0x1e4 show_stack+0x2c/0x40 dump_stack_lvl+0xac/0xe0 print_report+0x18c/0x4d8 kasan_report+0xe8/0x148 __hwasan_store8_noabort+0x88/0x98 lockdep_register_key+0x19c/0x1bc class_register+0x94/0x1ec init_module+0xbc/0xf48 [rfkill] do_one_initcall+0x17c/0x72c do_init_module+0x19c/0x3f8 ... Memory state around the buggy address: ffffff808b8c0100: 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a ffffff808b8c0200: 8a 8a 8a 8a 8a 8a 8a 8a fe fe fe fe fe fe fe fe >ffffff808b8c0300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffffff808b8c0400: 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 As CONFIG_KASAN_GENERIC is not set, Kasan reports invalid-access not use-aft",
    "evidence": "osv:CVE-2023-52468",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.14",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.7.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-52468",
      "aliases": [
        "CVE-2023-52468"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "dcfbb67e48a2becfce7990386e985b9c45098ee5"
                },
                {
                  "fixed": "b57196a5ec5e4c0ffecde8348b085b778c7dce04"
                },
                {
                  "fixed": "0f1486dafca3398c4c46b9f6e6452fa27e73b559"
                },
                {
                  "fixed": "93ec4a3b76404bce01bd5c9032bef5df6feb1d62"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52468.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.14"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52468.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.656912627Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0f1486dafca3398c4c46b9f6e6452fa27e73b559",
        "https://git.kernel.org/stable/c/93ec4a3b76404bce01bd5c9032bef5df6feb1d62",
        "https://git.kernel.org/stable/c/b57196a5ec5e4c0ffecde8348b085b778c7dce04",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52468.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52468",
        "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/2023/52xxx/CVE-2023-52468.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-52468",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505989,
  "published_at": "2024-02-25T08:16:32.387+00:00"
}