Vulnerability-Lookup

CVE-2026-45841 (GCVE-0-2026-45841)

Vulnerability from cvelistv5 – Published: 2026-05-27 09:24 – Updated: 2026-09-08 08:48

Title

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

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)

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6665 records in the last 180 days details

References

9 references

URL	Tags
https://git.kernel.org/stable/c/cb833bbc1b3c51e08…
https://git.kernel.org/stable/c/26900306a5a2c3e4f…
https://git.kernel.org/stable/c/0694618cf3e9b1206…
https://git.kernel.org/stable/c/8def8fbd23f40e945…
https://git.kernel.org/stable/c/c55940895245d8ef6…
https://git.kernel.org/stable/c/fb965b1cfe92b28d2…
https://git.kernel.org/stable/c/9a05e195618a6d474…
https://git.kernel.org/stable/c/2195574dc6d9017d3…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

5 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < cb833bbc1b3c51e08652d3c86298307c07d3f2db (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 26900306a5a2c3e4f75c643a064525526bb6e5f3 (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 0694618cf3e9b120666e31f5f383a6e466d95a0d (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 8def8fbd23f40e945febe913d04b731012ce0082 (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < c55940895245d8ef658ab381248a28755218d625 (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 9a05e195618a6d474f2bcd5b6376d0ffc2f00366 (git) Affected: 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 , < 2195574dc6d9017d32ac346987e12659f931d932 (git)	guessed
Linux	Linux	Affected: 2.6.31 Unaffected: 0 , < 2.6.31 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)	guessed
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)	guessed
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.6",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T08:48:59.945Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_osf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cb833bbc1b3c51e08652d3c86298307c07d3f2db",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "26900306a5a2c3e4f75c643a064525526bb6e5f3",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "0694618cf3e9b120666e31f5f383a6e466d95a0d",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "8def8fbd23f40e945febe913d04b731012ce0082",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "c55940895245d8ef658ab381248a28755218d625",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "9a05e195618a6d474f2bcd5b6376d0ffc2f00366",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            },
            {
              "lessThan": "2195574dc6d9017d32ac346987e12659f931d932",
              "status": "affected",
              "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_osf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.31"
            },
            {
              "lessThan": "2.6.31",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-09-08T08:48:59.945Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45841",
      "date": "2026-10-14",
      "epss": "0.00166",
      "percentile": "0.05478"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-09T14:48:38.000Z",
      "cve": "CVE-2026-45841",
      "id": "msrc_CVE-2026-45841",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45841.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/netfilter/nfnetlink_osf.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "cb833bbc1b3c51e08652d3c86298307c07d3f2db",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "26900306a5a2c3e4f75c643a064525526bb6e5f3",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "0694618cf3e9b120666e31f5f383a6e466d95a0d",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8def8fbd23f40e945febe913d04b731012ce0082",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c55940895245d8ef658ab381248a28755218d625",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "9a05e195618a6d474f2bcd5b6376d0ffc2f00366",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2195574dc6d9017d32ac346987e12659f931d932",
                    "status": "affected",
                    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/netfilter/nfnetlink_osf.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.31"
                  },
                  {
                    "lessThan": "2.6.31",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.258",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.209",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.175",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.141",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.91",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.33",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.0.*",
                    "status": "unaffected",
                    "version": "7.0.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          },
          {
            "affectedData": [
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "06FFC430-8D78-4549-B8DB-B37AFAF4D4D3",
                    "versionEndExcluding": "5.10.258",
                    "versionStartIncluding": "2.6.31",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "919C10A9-7951-4A74-BADD-C135A0A8D8B4",
                    "versionEndExcluding": "5.15.209",
                    "versionStartIncluding": "5.11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "92385813-D91D-480D-83A1-F423D2CBB2BA",
                    "versionEndExcluding": "6.1.175",
                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "97A9FFFA-22BB-4D5C-9790-5A2286E392F7",
                    "versionEndExcluding": "6.6.141",
                    "versionStartIncluding": "6.2",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "C918746B-DE6F-448F-A93E-A04C5481688D",
                    "versionEndExcluding": "6.12.91",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "96D99E49-380D-43AB-BDBA-25C3AD018A9C",
                    "versionEndExcluding": "6.18.33",
                    "versionStartIncluding": "6.13",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A13475D2-59BF-4716-94B5-7C1D239A2CF4",
                    "versionEndExcluding": "7.0.10",
                    "versionStartIncluding": "6.19",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "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)"
          }
        ],
        "id": "CVE-2026-45841",
        "lastModified": "2026-09-08T09:18:06.090",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-05-27T11:16:23.493",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0694618cf3e9b120666e31f5f383a6e466d95a0d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2195574dc6d9017d32ac346987e12659f931d932"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/26900306a5a2c3e4f75c643a064525526bb6e5f3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8def8fbd23f40e945febe913d04b731012ce0082"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9a05e195618a6d474f2bcd5b6376d0ffc2f00366"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c55940895245d8ef658ab381248a28755218d625"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/cb833bbc1b3c51e08652d3c86298307c07d3f2db"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-369"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T05:47:50+00:00",
      "cve": "CVE-2026-45841",
      "id": "CVE-2026-45841",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45841.json",
      "version": "3"
    }
  }
}

SUSE-SU-2026:22769-1

Vulnerability from csaf_suse - Published: 2026-07-21 08:27 - Updated: 2026-10-13 09:45

Summary

Security update for the Linux Kernel

Severity

Important

Scope

255 vulnerabilities in this advisory, including CVE-2026-45841.

CVE-2026-45841

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:22812-1

Vulnerability from csaf_suse - Published: 2026-07-21 08:27 - Updated: 2026-10-13 09:45

Summary

Security update for the Linux Kernel

Severity

Important

Scope

255 vulnerabilities in this advisory, including CVE-2026-45841.

CVE-2026-45841

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 9 products

Open the full advisory

SUSE-SU-2026:22835-1

Vulnerability from csaf_suse - Published: 2026-07-21 08:27 - Updated: 2026-10-13 09:45

Summary

Security update for the Linux Kernel

Severity

Important

Scope

255 vulnerabilities in this advisory, including CVE-2026-45841.

CVE-2026-45841

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 114 products

Open the full advisory

SUSE-SU-2026:2450-1

Vulnerability from csaf_suse - Published: 2026-06-18 13:36 - Updated: 2026-09-17 16:23

Summary

Security update for the Linux Kernel

Severity

Important

Scope

84 vulnerabilities in this advisory, including CVE-2026-45841.

CVE-2026-45841

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 164 products

Open the full advisory

SUSE-SU-2026:2799-1

Vulnerability from csaf_suse - Published: 2026-07-08 14:58 - Updated: 2026-10-13 09:46

Summary

Security update for the Linux Kernel

Severity

Important

Scope

168 vulnerabilities in this advisory, including CVE-2026-45841.

CVE-2026-45841

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 19 products

Open the full advisory

UBUNTU-CVE-2026-45841 (CVE-2026-45841)

Vulnerability from osv_ubuntu – Published: 2026-05-27 11:16 – Updated: 2026-10-14 00:11 – Source website

Details

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)

Severity

5.5 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-45841	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-45841	REPORT
	https://git.kernel.org/linus/2195574dc6d9017d32ac…	REPORT
	https://ubuntu.com/security/notices/USN-8566-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8568-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8569-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8567-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8574-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8575-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8576-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8593-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8574-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8595-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8596-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8575-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8576-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8603-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8595-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8606-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8607-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8608-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8609-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8575-3	ADVISORY
	https://ubuntu.com/security/notices/USN-8610-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8618-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8574-3	ADVISORY
	https://ubuntu.com/security/notices/USN-8595-3	ADVISORY
	https://ubuntu.com/security/notices/USN-8619-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8620-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8620-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8620-3	ADVISORY
	https://ubuntu.com/security/notices/USN-8620-4	ADVISORY
	https://ubuntu.com/security/notices/USN-8663-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8664-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8665-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8668-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8728-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8668-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8728-2	ADVISORY
	https://ubuntu.com/security/notices/USN-8728-3	ADVISORY

JSON

To clipboard

Loading 1.0 MB of JSON…

WID-SEC-W-2026-1691

Vulnerability from csaf_certbund - Published: 2026-05-26 22:00 - Updated: 2026-08-02 22:00

Summary

Linux Kernel: Mehrere Schwachstellen

Severity

Hoch

Scope

10 vulnerabilities in this advisory, including CVE-2026-45841.

CVE-2026-45841

Known affected: 6 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-45841 (GCVE-0-2026-45841)

SUSE-SU-2026:22769-1

SUSE-SU-2026:22812-1

SUSE-SU-2026:22835-1

SUSE-SU-2026:2450-1

SUSE-SU-2026:2799-1

UBUNTU-CVE-2026-45841 (CVE-2026-45841)

WID-SEC-W-2026-1691

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour