misc: fastrpc: Fix use-after-free and race in fastrpc_map_find

{
  "id": "c84d82af2d7fb9173a6e6ba337ff34a9228f02164064940560be40526f25d1da",
  "url": "https://osv.dev/vulnerability/CVE-2022-48874",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "misc: fastrpc: Fix use-after-free and race in fastrpc_map_find",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix use-after-free and race in fastrpc_map_find Currently, there is a race window between the point when the mutex is unlocked in fastrpc_map_lookup and the reference count increasing (fastrpc_map_get) in fastrpc_map_find, which can also lead to use-after-free. So lets merge fastrpc_map_find into fastrpc_map_lookup which allows us to both protect the maps list by also taking the &fl->lock spinlock and the reference count, since the spinlock will be released only after. Add take_ref argument to make this suitable for all callers.",
    "evidence": "osv:CVE-2022-48874",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.8",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
    "structured": {
      "id": "CVE-2022-48874",
      "aliases": [
        "CVE-2022-48874"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
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      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  "fixed": "9446fa1683a7e3937d9970248ced427c1983a1c5"
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          "database_specific": {
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.18.0"
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                  "fixed": "6.1.8"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48874.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.610842660Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/9446fa1683a7e3937d9970248ced427c1983a1c5",
        "https://git.kernel.org/stable/c/a50c5c25b6e7d2824698c0e6385f882a18f4a498",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48874.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-48874",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 517731,
  "published_at": "2024-08-21T06:10:05.081+00:00"
}