CVE-2026-45841 (GCVE-0-2026-45841)
Vulnerability from cvelistv5
Published
2026-05-27 09:24
Modified
2026-06-14 17:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO nf_osf_match_one() computes ctx->window % f->wss.val in the OSF_WSS_MODULO branch with no guard for f->wss.val == 0. A CAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a subsequent matching TCP SYN divides by zero and panics the kernel. Reject the bogus fingerprint in nfnl_osf_add_callback() above the per-option for-loop. f->wss is per-fingerprint, not per-option, so the check must run regardless of f->opt_num (including 0). Also reject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that as "should not happen". Crash: Oops: divide error: 0000 [#1] SMP KASAN NOPTI RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: <IRQ> nf_osf_match (net/netfilter/nfnetlink_osf.c:220) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:348) nf_hook_slow (net/netfilter/core.c:622) ip_local_deliver (net/ipv4/ip_input.c:265) ip_rcv (include/linux/skbuff.h:1162) __netif_receive_skb_one_core (net/core/dev.c:6181) process_backlog (net/core/dev.c:6642) __napi_poll (net/core/dev.c:7710) net_rx_action (net/core/dev.c:7945) handle_softirqs (kernel/softirq.c:622)
Impacted products
Vendor Product Version
Linux Linux Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
Version: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_osf.c"
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          "vendor": "Linux",
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              "version": "0",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO\n\nnf_osf_match_one() computes ctx-\u003ewindow % f-\u003ewss.val in the\nOSF_WSS_MODULO branch with no guard for f-\u003ewss.val == 0. A\nCAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a\nsubsequent matching TCP SYN divides by zero and panics the kernel.\n\nReject the bogus fingerprint in nfnl_osf_add_callback() above the\nper-option for-loop. f-\u003ewss is per-fingerprint, not per-option, so\nthe check must run regardless of f-\u003eopt_num (including 0). Also\nreject wss.wc \u003e= OSF_WSS_MAX; nf_osf_match_one() already treats that\nas \"should not happen\".\n\nCrash:\n Oops: divide error: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98)\n Call Trace:\n \u003cIRQ\u003e\n  nf_osf_match (net/netfilter/nfnetlink_osf.c:220)\n  xt_osf_match_packet (net/netfilter/xt_osf.c:32)\n  ipt_do_table (net/ipv4/netfilter/ip_tables.c:348)\n  nf_hook_slow (net/netfilter/core.c:622)\n  ip_local_deliver (net/ipv4/ip_input.c:265)\n  ip_rcv (include/linux/skbuff.h:1162)\n  __netif_receive_skb_one_core (net/core/dev.c:6181)\n  process_backlog (net/core/dev.c:6642)\n  __napi_poll (net/core/dev.c:7710)\n  net_rx_action (net/core/dev.c:7945)\n  handle_softirqs (kernel/softirq.c:622)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:46:14.099Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb833bbc1b3c51e08652d3c86298307c07d3f2db"
        },
        {
          "url": "https://git.kernel.org/stable/c/26900306a5a2c3e4f75c643a064525526bb6e5f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/0694618cf3e9b120666e31f5f383a6e466d95a0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8def8fbd23f40e945febe913d04b731012ce0082"
        },
        {
          "url": "https://git.kernel.org/stable/c/c55940895245d8ef658ab381248a28755218d625"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a05e195618a6d474f2bcd5b6376d0ffc2f00366"
        },
        {
          "url": "https://git.kernel.org/stable/c/2195574dc6d9017d32ac346987e12659f931d932"
        }
      ],
      "title": "netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45841",
    "datePublished": "2026-05-27T09:24:40.805Z",
    "dateReserved": "2026-05-13T15:03:33.078Z",
    "dateUpdated": "2026-06-14T17:46:14.099Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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