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netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO

Type: advisorySource: Official CVE List1 source record

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: 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)

Announced Source revision 1
Original source ↗

CVE-2026-45841

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-45841

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "cb833bbc1b3c51e08652d3c86298307c07d3f2db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "26900306a5a2c3e4f75c643a064525526bb6e5f3",
        "versionType": "git"
      },
      {
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        "lessThan": "0694618cf3e9b120666e31f5f383a6e466d95a0d",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "8def8fbd23f40e945febe913d04b731012ce0082",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "c55940895245d8ef658ab381248a28755218d625",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "9a05e195618a6d474f2bcd5b6376d0ffc2f00366",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
        "lessThan": "2195574dc6d9017d32ac346987e12659f931d932",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_osf.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.31"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.31",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_osf.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-45841

Source reference: /cveMetadata/cveId

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No explicit severity was provided.

Event
#28365 · Revision 1
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