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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nf_osf_match_one在OSF_WSS_MODULO分支计算ctx->window % f->wss.val时未检查f->wss.val为零，可能导致CAP_NET_ADMIN用户添加此类指纹后后续匹配TCP SYN除零导致内核崩溃。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.13% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< cb833bbc1b3c51e08652d3c86298307c07d3f2db affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 26900306a5a2c3e4f75c643a064525526bb6e5f3 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 0694618cf3e9b120666e31f5f383a6e466d95a0d affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 8def8fbd23f40e945febe913d04b731012ce0082 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< c55940895245d8ef658ab381248a28755218d625 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 9a05e195618a6d474f2bcd5b6376d0ffc2f00366 affected
11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384< 2195574dc6d9017d32ac346987e12659f931d932 affected
… +10 more rows
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I. Basic Information for CVE-2026-45841

Vulnerability Information
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Vulnerability Title
netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO
Source: CVE Program / CVE List V5
Vulnerability 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)
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nf_osf_match_one在OSF_WSS_MODULO分支计算ctx->window % f->wss.val时未检查f->wss.val为零，可能导致CAP_NET_ADMIN用户添加此类指纹后后续匹配TCP SYN除零导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 ~ cb833bbc1b3c51e08652d3c86298307c07d3f2db -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2026-45841

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III. Intelligence Information for CVE-2026-45841

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Patches & Fixes for CVE-2026-45841 (7)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45910 7.8 HIGH RDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-45931 7.8 HIGH accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
CVE-2026-45956 7.8 HIGH drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-46100 7.8 HIGH fs: afs: revert mmap_prepare() change
CVE-2026-45894 7.8 HIGH iommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-45933 7.8 HIGH bpf: Preserve id of register in sync_linked_regs()

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45841

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