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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-45841
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 11:16:23 UTC
Updated2026-06-01 17:17:14 UTC
DescriptionIn 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)

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.050770000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 cb833bbc1b3c51e08652d3c86298307c07d3f2db git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 26900306a5a2c3e4f75c643a064525526bb6e5f3 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 0694618cf3e9b120666e31f5f383a6e466d95a0d git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 8def8fbd23f40e945febe913d04b731012ce0082 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 c55940895245d8ef658ab381248a28755218d625 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 9a05e195618a6d474f2bcd5b6376d0ffc2f00366 git Not specified
CNA Linux Linux affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 2195574dc6d9017d32ac346987e12659f931d932 git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2195574dc6d9017d32ac346987e12659f931d932 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a05e195618a6d474f2bcd5b6376d0ffc2f00366 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8def8fbd23f40e945febe913d04b731012ce0082 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb833bbc1b3c51e08652d3c86298307c07d3f2db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0694618cf3e9b120666e31f5f383a6e466d95a0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26900306a5a2c3e4f75c643a064525526bb6e5f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c55940895245d8ef658ab381248a28755218d625 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report