{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2022-50555",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50555",
    "idYear": 2022,
    "status": "PUBLISHED",
    "publishedAt": "2025-10-07T15:21:16.179Z",
    "updatedAt": "2026-08-05T08:59:07.298Z",
    "importedAt": "2026-10-24T01:56:49.724Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "tipc: fix a null-ptr-deref in tipc_topsrv_accept",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix a null-ptr-deref in tipc_topsrv_accept\n\nsyzbot found a crash in tipc_topsrv_accept:\n\n  KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\n  Workqueue: tipc_rcv tipc_topsrv_accept\n  RIP: 0010:kernel_accept+0x22d/0x350 net/socket.c:3487\n  Call Trace:\n   <TASK>\n   tipc_topsrv_accept+0x197/0x280 net/tipc/topsrv.c:460\n   process_one_work+0x991/0x1610 kernel/workqueue.c:2289\n   worker_thread+0x665/0x1080 kernel/workqueue.c:2436\n   kthread+0x2e4/0x3a0 kernel/kthread.c:376\n   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n\nIt was caused by srv->listener that might be set to null by\ntipc_topsrv_stop() in net .exit whereas it's still used in\ntipc_topsrv_accept() worker.\n\nsrv->listener is protected by srv->idr_lock in tipc_topsrv_stop(), so add\na check for srv->listener under srv->idr_lock in tipc_topsrv_accept() to\navoid the null-ptr-deref. To ensure the lsock is not released during the\ntipc_topsrv_accept(), move sock_release() after tipc_topsrv_work_stop()\nwhere it's waiting until the tipc_topsrv_accept worker to be done.\n\nNote that sk_callback_lock is used to protect sk->sk_user_data instead of\nsrv->listener, and it should check srv in tipc_topsrv_listener_data_ready()\ninstead. This also ensures that no more tipc_topsrv_accept worker will be\nstarted after tipc_conn_close() is called in tipc_topsrv_stop() where it\nsets sk->sk_user_data to null.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0ef897be12b8b4cf297b6016e79ec97ec90f2cf6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ce69bdac2310152bb70845024d5d704c52aabfc3"
            },
            {
              "version": "0ef897be12b8b4cf297b6016e79ec97ec90f2cf6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "24b129aed8730e48f47d852d58d76825ab6f407c"
            },
            {
              "version": "0ef897be12b8b4cf297b6016e79ec97ec90f2cf6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "32a3d4660b34ce49ac0162338ebe362098e2f5df"
            },
            {
              "version": "0ef897be12b8b4cf297b6016e79ec97ec90f2cf6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7a939503fc32bff4ed60800b73ff7fbb4aea2142"
            },
            {
              "version": "0ef897be12b8b4cf297b6016e79ec97ec90f2cf6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cedb41664e27b2cae7e21487f1bee22dcd84037d"
            },
            {
              "version": "0ef897be12b8b4cf297b6016e79ec97ec90f2cf6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "82cb4e4612c633a9ce320e1773114875604a3cce"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.17",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.17"
            },
            {
              "version": "4.19.264",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.223",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.153",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.77",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.0.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "version": "6.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}