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CVE-2026-45860— netfilter: nf_conncount: increase the connection clean up limit to 64

CVSS 7.5 · High EPSS 0.05% · P16

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 20

VendorProductVersion RangeStatus
LinuxLinuxf106694733c66a48740c25bc4e212e9b2ea364ce< a5c9e14e0e8923218ae881d5e78c990c07694966affected
be69850b461e7b491d87a22e33ab76fdd04b725e< 13eede458fdf231f1bf96a398feea4ad1553f14caffected
d265929930e2ffafc744c0ae05fb70acd53be1ee< fa85432d58c8e74b39333edbf8d28df2985dfc79affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 0792ad077d776c2dcf20f0484e2461ded1b77a24affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 3d0994ed0aa1fc0a2c5e620b765e8defdd021bffaffected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 6e5fa7add3e76da068a478d905be64be8fa4e80aaffected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 0af0812baf2d363176c9b76fc07e33f13aede8dbaffected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 21d033e472735ecec677f1ae46d6740b5e47a4f3affected
… +12 more rows
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I. Basic Information for CVE-2026-45860

Vulnerability Information
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Vulnerability Title
netfilter: nf_conncount: increase the connection clean up limit to 64
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: increase the connection clean up limit to 64 After the optimization to only perform one GC per jiffy, a new problem was introduced. If more than 8 new connections are tracked per jiffy the list won't be cleaned up fast enough possibly reaching the limit wrongly. In order to prevent this issue, only skip the GC if it was already triggered during the same jiffy and the increment is lower than the clean up limit. In addition, increase the clean up limit to 64 connections to avoid triggering GC too often and do more effective GCs. This has been tested using a HTTP server and several performance tools while having nft_connlimit/xt_connlimit or OVS limit configured. Output of slowhttptest + OVS limit at 52000 connections: slow HTTP test status on 340th second: initializing: 0 pending: 432 connected: 51998 error: 0 closed: 0 service available: YES
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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netfilter nf_conncount模块的连接清理限制过小，可能导致连接数错误达到上限。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux f106694733c66a48740c25bc4e212e9b2ea364ce ~ a5c9e14e0e8923218ae881d5e78c990c07694966 -
LinuxLinux 5.19 -

II. Public POCs for CVE-2026-45860

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III. Intelligence Information for CVE-2026-45860

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Patches & Fixes for CVE-2026-45860 (8)

Same Patch Batch · Linux · 2026-05-27 · 276 CVEs total

CVE-2026-460399.8 CRITICALrxgk: Fix potential integer overflow in length check
CVE-2026-458989.8 CRITICALRDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-459889.8 CRITICALrxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-459729.8 CRITICALsmb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-460439.1 CRITICALRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-460568.8 HIGHBluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-459458.8 HIGHiommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-460378.2 HIGHipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-458438.2 HIGHslip: bound decode() reads against the compressed packet length
CVE-2026-460108.1 HIGHrxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-460998.1 HIGHnet: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-460767.9 HIGHKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-458787.8 HIGHdrm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-459597.8 HIGHcrypto: ccp - Fix a crash due to incorrect cleanup usage of kfree
CVE-2026-460117.8 HIGHmedia: mtk-jpeg: fix use-after-free in release path due to uncancelled work
CVE-2026-458947.8 HIGHiommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-460157.8 HIGHtcp: call sk_data_ready() after listener migration
CVE-2026-458527.8 HIGHRDMA/rxe: Fix double free in rxe_srq_from_init
CVE-2026-460537.8 HIGHnet: rds: fix MR cleanup on copy error
CVE-2026-458627.8 HIGHiommu/vt-d: Flush cache for PASID table before using it

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45860

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