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CVE-2026-23272— netfilter: nf_tables: unconditionally bump set->nelems before insertion

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_tables集合元素插入时未正确增加nelems计数，可能导致RCU读取器访问已释放元素。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 35d0ac9070ef619e3bf44324375878a1c540387b< 25fcaef7948912652905e96922f36583a84fffed affected
35d0ac9070ef619e3bf44324375878a1c540387b< e3ccb11fc8249759d23326038c8db987ddaabc77 affected
35d0ac9070ef619e3bf44324375878a1c540387b< 86bc4b1a0f672d47ac19f9022432cb6a2e01cb33 affected
35d0ac9070ef619e3bf44324375878a1c540387b< 6826131c7674329335ca25df2550163eb8a1fd0c affected
35d0ac9070ef619e3bf44324375878a1c540387b< ccb8c8f3c1127cf34d18c737309897c68046bf21 affected
35d0ac9070ef619e3bf44324375878a1c540387b< def602e498a4f951da95c95b1b8ce8ae68aa733a affected
fefdd79403e89b0c673965343b92e2e01e2713a8 affected
4.9.33< 4.10 affected
… +8 more rows
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I. Basic Information for CVE-2026-23272

Vulnerability Information
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Vulnerability Title
netfilter: nf_tables: unconditionally bump set->nelems before insertion
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already. To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state. As for element updates, decrement set->nelems to restore it. A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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_tables集合元素插入时未正确增加nelems计数，可能导致RCU读取器访问已释放元素。
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 35d0ac9070ef619e3bf44324375878a1c540387b ~ 25fcaef7948912652905e96922f36583a84fffed -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-23272

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III. Intelligence Information for CVE-2026-23272

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Patches & Fixes for CVE-2026-23272 (6)

Same Patch Batch · Linux · 2026-03-20 · 8 CVEs total

CVE-2026-23278 7.8 HIGH netfilter: nf_tables: always walk all pending catchall elements
CVE-2026-23275 7.8 HIGH io_uring: ensure ctx->rings is stable for task work flags manipulation
CVE-2026-23274 7.8 HIGH netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
CVE-2026-23273 7.8 HIGH macvlan: observe an RCU grace period in macvlan_common_newlink() error path
CVE-2026-23271 7.8 HIGH perf: Fix __perf_event_overflow() vs perf_remove_from_context() race
CVE-2026-23276 net: add xmit recursion limit to tunnel xmit functions
CVE-2026-23277 net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23272

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