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CVE-2026-23139— netfilter: nf_conncount: update last_gc only when GC has been performed

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_conncount模块错误更新last_gc值，可能导致连接列表无限增长和资源耗尽。

CVSS 7.5 · High EPSS 0.38% · P31

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux f106694733c66a48740c25bc4e212e9b2ea364ce< 2c7c71113ed6d3e2f3aca4c088f22283016ff34f affected
be69850b461e7b491d87a22e33ab76fdd04b725e< c4cde57c8affdcca5bcff53a1047e15d268bdca1 affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 9f45588993d7f115280fc726119ca86fba32a811 affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 3cd717359e56f82f06cbf8279b47a7d79880c6f3 affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 26a82dce2beee39c43c109d9647e16f49cb02a35 affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 8bdafdf4900040a81422056cabe5e00a37bd101a affected
d265929930e2ffafc744c0ae05fb70acd53be1ee< 7811ba452402d58628e68faedf38745b3d485e3c affected
5.19 affected
… +6 more rows
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I. Basic Information for CVE-2026-23139

Vulnerability Information
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Vulnerability Title
netfilter: nf_conncount: update last_gc only when GC has been performed
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: update last_gc only when GC has been performed Currently last_gc is being updated everytime a new connection is tracked, that means that it is updated even if a GC wasn't performed. With a sufficiently high packet rate, it is possible to always bypass the GC, causing the list to grow infinitely. Update the last_gc value only when a GC has been actually performed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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_conncount模块错误更新last_gc值，可能导致连接列表无限增长和资源耗尽。
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 f106694733c66a48740c25bc4e212e9b2ea364ce ~ 2c7c71113ed6d3e2f3aca4c088f22283016ff34f -
Linux Linux 5.19 -

II. Public POCs for CVE-2026-23139

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III. Intelligence Information for CVE-2026-23139

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Same Patch Batch · Linux · 2026-02-14 · 108 CVEs total

CVE-2025-71202 8.8 HIGH iommu/sva: invalidate stale IOTLB entries for kernel address space
CVE-2026-23193 8.8 HIGH scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()
CVE-2026-23172 8.4 HIGH net: wwan: t7xx: fix potential skb->frags overflow in RX path
CVE-2026-23209 7.8 HIGH macvlan: fix error recovery in macvlan_common_newlink()
CVE-2025-71221 7.8 HIGH dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()
CVE-2026-23178 7.8 HIGH HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()
CVE-2026-23184 7.8 HIGH binder: fix UAF in binder_netlink_report()
CVE-2026-23185 7.8 HIGH wifi: iwlwifi: mld: cancel mlo_scan_start_wk
CVE-2026-23171 7.8 HIGH bonding: fix use-after-free due to enslave fail after slave array update
CVE-2026-23169 7.8 HIGH mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()
CVE-2026-23191 7.8 HIGH ALSA: aloop: Fix racy access at PCM trigger
CVE-2026-23192 7.8 HIGH linkwatch: use __dev_put() in callers to prevent UAF
CVE-2026-23198 7.8 HIGH KVM: Don't clobber irqfd routing type when deassigning irqfd
CVE-2026-23136 7.5 HIGH libceph: reset sparse-read state in osd_fault()
CVE-2025-71204 7.5 HIGH smb/server: fix refcount leak in parse_durable_handle_context()
CVE-2026-23148 7.5 HIGH nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
CVE-2026-23161 7.3 HIGH mm/shmem, swap: fix race of truncate and swap entry split
CVE-2026-23204 7.1 HIGH net/sched: cls_u32: use skb_header_pointer_careful()
CVE-2025-71201 7.1 HIGH netfs: Fix early read unlock of page with EOF in middle
CVE-2026-23180 7.0 HIGH dpaa2-switch: add bounds check for if_id in IRQ handler

Showing top 20 of 108 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23139

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