{
  "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-2023-53121",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53121",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-05-02T15:55:58.123Z",
    "updatedAt": "2026-05-11T19:38:55.282Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "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": "tcp: tcp_make_synack() can be called from process context",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: tcp_make_synack() can be called from process context\n\ntcp_rtx_synack() now could be called in process context as explained in\n0a375c822497 (\"tcp: tcp_rtx_synack() can be called from process\ncontext\").\n\ntcp_rtx_synack() might call tcp_make_synack(), which will touch per-CPU\nvariables with preemption enabled. This causes the following BUG:\n\n    BUG: using __this_cpu_add() in preemptible [00000000] code: ThriftIO1/5464\n    caller is tcp_make_synack+0x841/0xac0\n    Call Trace:\n     <TASK>\n     dump_stack_lvl+0x10d/0x1a0\n     check_preemption_disabled+0x104/0x110\n     tcp_make_synack+0x841/0xac0\n     tcp_v6_send_synack+0x5c/0x450\n     tcp_rtx_synack+0xeb/0x1f0\n     inet_rtx_syn_ack+0x34/0x60\n     tcp_check_req+0x3af/0x9e0\n     tcp_rcv_state_process+0x59b/0x2030\n     tcp_v6_do_rcv+0x5f5/0x700\n     release_sock+0x3a/0xf0\n     tcp_sendmsg+0x33/0x40\n     ____sys_sendmsg+0x2f2/0x490\n     __sys_sendmsg+0x184/0x230\n     do_syscall_64+0x3d/0x90\n\nAvoid calling __TCP_INC_STATS() with will touch per-cpu variables. Use\nTCP_INC_STATS() which is safe to be called from context switch.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d493d4fe88195a144d6a277a90062a7534ed2192"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e23ca307745be3df7fe9762f3e2a7e311a57852e"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "442aa78ed70188b21ccd8669738448702c0a3281"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad07290d63ff6689f50565b02f5b6f34ec15a5ca"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9180aa4622a720b433e842b4d3aa34d73eec577a"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c"
            },
            {
              "version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.7",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.7"
            },
            {
              "version": "4.14.311",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.279",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.238",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.176",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.104",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.21",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.2.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.2.*"
            },
            {
              "version": "6.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}