{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-27T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO",
    "id" : "2481867",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2481867"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-369",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO\nnf_osf_match_one() computes ctx->window % f->wss.val in the\nOSF_WSS_MODULO branch with no guard for f->wss.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.\nReject the bogus fingerprint in nfnl_osf_add_callback() above the\nper-option for-loop. f->wss is per-fingerprint, not per-option, so\nthe check must run regardless of f->opt_num (including 0). Also\nreject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that\nas \"should not happen\".\nCrash:\nOops: divide error: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98)\nCall Trace:\n<IRQ>\nnf_osf_match (net/netfilter/nfnetlink_osf.c:220)\nxt_osf_match_packet (net/netfilter/xt_osf.c:32)\nipt_do_table (net/ipv4/netfilter/ip_tables.c:348)\nnf_hook_slow (net/netfilter/core.c:622)\nip_local_deliver (net/ipv4/ip_input.c:265)\nip_rcv (include/linux/skbuff.h:1162)\n__netif_receive_skb_one_core (net/core/dev.c:6181)\nprocess_backlog (net/core/dev.c:6642)\n__napi_poll (net/core/dev.c:7710)\nnet_rx_action (net/core/dev.c:7945)\nhandle_softirqs (kernel/softirq.c:622)", "A flaw was found in the Linux kernel's netfilter component. A local attacker with CAP_NET_ADMIN capabilities, which grants certain network administration privileges, could trigger a divide-by-zero error by adding a specially crafted fingerprint via nfnetlink. This vulnerability could lead to a kernel panic, effectively causing a Denial of Service (DoS) on the affected system." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-45841\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45841\nhttps://lore.kernel.org/linux-cve-announce/2026052712-CVE-2026-45841-9575@gregkh/T" ],
  "name" : "CVE-2026-45841",
  "csaw" : false
}