Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-72256— netfilter: xt_cluster: reject template conntracks in hash match

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基金会开源的一个操作系统内核。 Linux kernel 2.6.30版本至7.2-rc1之前版本存在安全漏洞，该漏洞源于netfilter xt_cluster哈希匹配将任何非NULL的nf_ct_get()结果视为完全初始化的conntrack，导致状态混淆，可能触发WARN_ON路径。

AI Predicted 4.4 Difficulty: Hard EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0269ea4937343536ec7e85649932bc8c9686ea78< 4558bd7b47c7be82dffd837f27be8ea3ecee557d affected
0269ea4937343536ec7e85649932bc8c9686ea78< d5f9d050b0b267227c1f02f11021872c7768a9cc affected
0269ea4937343536ec7e85649932bc8c9686ea78< 4cb8b5f586e41c187942291cc0938006077fa79e affected
0269ea4937343536ec7e85649932bc8c9686ea78< fac2fdac3baad9ffd12b3b0bba4374d4b3585d54 affected
0269ea4937343536ec7e85649932bc8c9686ea78< 13ea4f86cf738c74be2146886ac261988a631e62 affected
0269ea4937343536ec7e85649932bc8c9686ea78< 07f9ddbf5e799c24a3a52ec9bd7b729a6f6d69d5 affected
0269ea4937343536ec7e85649932bc8c9686ea78< 5b2d4f0010018a7aa3495aa1dbf1b7a34011e7aa affected
0269ea4937343536ec7e85649932bc8c9686ea78< 5feba91006ec92da57acc1cc2e34df623b98541e affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-72256

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
netfilter: xt_cluster: reject template conntracks in hash match
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_cluster: reject template conntracks in hash match xt_cluster_mt() treats any non-NULL nf_ct_get() result as a fully initialized conntrack and passes it to xt_cluster_hash(). This causes a state confusion bug when the raw table CT target attaches a template conntrack to skb->_nfct before normal conntrack processing. Templates carry IPS_TEMPLATE status but do not have a valid tuple for hashing yet, so xt_cluster_hash() can hit its WARN_ON() path on the zeroed l3num field. Reject template conntracks before hashing them. This matches existing netfilter handling for template objects and avoids hashing incomplete conntrack state.
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基金会开源的一个操作系统内核。 Linux kernel 2.6.30版本至7.2-rc1之前版本存在安全漏洞，该漏洞源于netfilter xt_cluster哈希匹配将任何非NULL的nf_ct_get()结果视为完全初始化的conntrack，导致状态混淆，可能触发WARN_ON路径。
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 0269ea4937343536ec7e85649932bc8c9686ea78 ~ 4558bd7b47c7be82dffd837f27be8ea3ecee557d -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-72256

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-72256

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-72256 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72185 9.8 CRITICAL ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock()
CVE-2026-72417 9.8 CRITICAL netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q
CVE-2026-74361 9.8 CRITICAL nvme: fix FDP fdpcidx bounds check
CVE-2026-74268 9.8 CRITICAL tcp: clear sock_ops cb flags before force-closing a child socket
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-74478 9.8 CRITICAL um: vector: fix use-after-free in vector_mmsg_rx()
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72256

No comments yet

Leave a comment