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CVE-2026-72349— netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt()

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 4.10版本存在安全漏洞，该漏洞源于xt_rateest_mt()函数中u64截断问题，在高速链路上字节率超过2^32-1时导致比较结果不正确。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1562.001

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1c0d32fde5bdf1184bc274f864c09799278a1114< 77e9ba358d63fe2eb03c90d29ea85651d95cf2e6 affected
1c0d32fde5bdf1184bc274f864c09799278a1114< a3ba938f45cb00f6bf49d3aa3647df9b017f5f08 affected
1c0d32fde5bdf1184bc274f864c09799278a1114< bab305dd769d78074adca73505cc2509e1206bf2 affected
1c0d32fde5bdf1184bc274f864c09799278a1114< 5da915fc159c6b4091669447588e520183969cca affected
1c0d32fde5bdf1184bc274f864c09799278a1114< d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b affected
1c0d32fde5bdf1184bc274f864c09799278a1114< e702f6dd5d21e331f55fd9168c0210542008546d affected
1c0d32fde5bdf1184bc274f864c09799278a1114< 905a927b2e6fec7b174e9e5644d271047b61378f affected
1c0d32fde5bdf1184bc274f864c09799278a1114< 444853cd438201007da5359821adcc2995655ab1 affected
… +10 more rows
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I. Basic Information for CVE-2026-72349

Vulnerability Information
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Vulnerability Title
netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt() On links faster than ~34 Gbps, where byte rate may exceed 2^32-1 (~ 4.3 GBps), the comparison result becomes incorrect because the truncated value no longer reflects the actual estimator rate. Fix by changing the local variables to u64.
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 4.10版本存在安全漏洞，该漏洞源于xt_rateest_mt()函数中u64截断问题，在高速链路上字节率超过2^32-1时导致比较结果不正确。
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 1c0d32fde5bdf1184bc274f864c09799278a1114 ~ 77e9ba358d63fe2eb03c90d29ea85651d95cf2e6 -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-72349

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III. Intelligence Information for CVE-2026-72349

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Patches & Fixes for CVE-2026-72349 (8)

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

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
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-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
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-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-72351 9.8 CRITICAL gue: validate REMCSUM private option length

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-2026-72349

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