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CVE-2026-45841netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO

Description

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)

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 6 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-45841, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.13% · top 97% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < cb833bbc1b3c51e08652d3c86298307c07d3f2db
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < 26900306a5a2c3e4f75c643a064525526bb6e5f3
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < 0694618cf3e9b120666e31f5f383a6e466d95a0d
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < 8def8fbd23f40e945febe913d04b731012ce0082
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < c55940895245d8ef658ab381248a28755218d625
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < 9a05e195618a6d474f2bcd5b6376d0ffc2f00366
    • affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 – < 2195574dc6d9017d32ac346987e12659f931d932

  • Linux · Linux

    • affected 2.6.31
    • unaffected < 2.6.31
    • unaffected 5.10.258 – ≤ 5.10.*
    • unaffected 5.15.209 – ≤ 5.15.*
    • unaffected 6.1.175 – ≤ 6.1.*
    • unaffected 6.6.141 – ≤ 6.6.*
    • unaffected 6.12.91 – ≤ 6.12.*
    • unaffected 6.18.33 – ≤ 6.18.*
    • unaffected 7.0.10 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

References11

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .