{
  "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-2026-74714",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74714",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-22T15:33:09.643Z",
    "updatedAt": "2026-10-16T19:16:11.358Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "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": "bpf: tcp: Fix use-after-free in bpf_iter_tcp_established_batch()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: tcp: Fix use-after-free in bpf_iter_tcp_established_batch()\n\nreqsk_queue_hash_req() publishes a TCP_NEW_SYN_RECV request_sock onto\nthe ehash chain, drops the bucket lock, and only afterwards sets\nrsk_refcnt to 3.\n\nLockless readers such as __inet_lookup_established() handle this with\nrefcount_inc_not_zero(), but bpf_iter_tcp_established_batch() uses plain\nsock_hold() while holding the bucket lock, on the assumption that the\nlock guarantees sk_refcnt > 0. That assumption does not hold for\nrequest_sock:\n\n  CPU 0                                CPU 1\n  -----                                -----\n  tcp_conn_request()\n   reqsk_queue_hash_req()\n    inet_ehash_insert(req)\n     spin_lock(bucket)\n     __sk_nulls_add_node_rcu(req)      // rsk_refcnt == 0\n     spin_unlock(bucket)\n                                       bpf_iter_tcp_established_batch()\n                                        spin_lock(bucket)\n                                        sock_hold(req)   <-- addition on 0\n                                        spin_unlock(bucket)\n    refcount_set(&req->rsk_refcnt, 3)  // clobbers saturated value\n\nwhich surfaces as:\n\n  refcount_t: addition on 0; use-after-free.\n  WARNING: lib/refcount.c:25 at refcount_warn_saturate+0x48/0x90, CPU#1\n  Call Trace:\n   bpf_iter_tcp_established_batch+0x14e/0x170\n   bpf_iter_tcp_batch+0x53/0x200\n   bpf_iter_tcp_seq_next+0x27/0x70\n   bpf_seq_read+0x107/0x410\n   vfs_read+0xb9/0x380\n\nThe iterator's stolen reference is lost when the publishing CPU's\nrefcount_set() overwrites the count, leaving the socket one reference\nshort. When the last legitimate owner drops its reference the reqsk is\nfreed while still reachable, leading to use-after-free.\n\nThis reproduces in seconds with tcp_syncookies=0, a handful of threads\ndoing connect()/close() to a local listener while others read an\niter/tcp link in a tight loop.\n\nUse refcount_inc_not_zero() and skip the socket on failure. A skipped\nsocket is still part of the bucket, so keep counting it in expected.\nThe reallocations are sized from expected, and a request sock whose\nrefcount gets published while the lock is held across the last realloc\nmust already have room.\n\nA skipped socket is counted in expected but never batched, so end_sk\ncan be short of expected on a batch that is actually complete. Decide\ncompleteness by whether the walk left any socket behind instead. The\nWARN after the locked realloc checks the same, replacing an\nend_sk == expected check that could not hold on that path since\ncommit cdec67a489d4 (\"bpf: tcp: Make sure iter->batch always\ncontains a full bucket snapshot\").\n\nIf every matching socket in a bucket is mid-init (refcount 0), end_sk\nstays 0. Advance to the next bucket rather than returning a batch entry\nthat was never filled this round.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "04c7820b776f1c4b48698574c47de9e940d368e8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cc0295f89296ed351fc4b0b48fee887ba02c5d24"
            },
            {
              "version": "04c7820b776f1c4b48698574c47de9e940d368e8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ddbe966b5d1fe212ada749bc3d0b410f1a7dea74"
            },
            {
              "version": "04c7820b776f1c4b48698574c47de9e940d368e8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7d2b60a4bc0499f62ff8520af6309bbe170882fd"
            },
            {
              "version": "04c7820b776f1c4b48698574c47de9e940d368e8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cefcbbe20846a45f9a7dae868f7ef1000953e2df"
            },
            {
              "version": "04c7820b776f1c4b48698574c47de9e940d368e8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "97e74d3e45d653c07c2d406fc530a9bbe3df8396"
            },
            {
              "version": "04c7820b776f1c4b48698574c47de9e940d368e8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e5fd3f514e27db1f05fbd72ba615d74941e23c51"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.15"
            },
            {
              "version": "6.1.183",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.152",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.104",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.45",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}