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CVE-2026-23274— netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels

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xt_IDLETIMER模块允许rev0规则重用ALARM类型定时器标签，可能导致未初始化定时器列表被修改。

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 68983a354a655c35d3fb204489d383a2a051fda7< 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 affected
68983a354a655c35d3fb204489d383a2a051fda7< 144f88054ba0180467356f40895bd660b5dceeec affected
68983a354a655c35d3fb204489d383a2a051fda7< 28c7cfaf0c0ab17cbd7754092116fd1af45271f9 affected
68983a354a655c35d3fb204489d383a2a051fda7< 54080355999381fed4a26129579a5765bab87491 affected
68983a354a655c35d3fb204489d383a2a051fda7< 5e7ece24c5cb75a60402aad4d803c7898ea40aa9 affected
68983a354a655c35d3fb204489d383a2a051fda7< f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1 affected
68983a354a655c35d3fb204489d383a2a051fda7< f228b9ae2a7e84d1153616d8e71c4236cb1f1309 affected
68983a354a655c35d3fb204489d383a2a051fda7< 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf affected
… +10 more rows
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I. Basic Information for CVE-2026-23274

Vulnerability Information
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Vulnerability Title
netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1. Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type.
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xt_IDLETIMER模块允许rev0规则重用ALARM类型定时器标签，可能导致未初始化定时器列表被修改。
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 68983a354a655c35d3fb204489d383a2a051fda7 ~ 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-23274

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III. Intelligence Information for CVE-2026-23274

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Patches & Fixes for CVE-2026-23274 (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-2026-23273 7.8 HIGH macvlan: observe an RCU grace period in macvlan_common_newlink() error path
CVE-2026-23272 7.8 HIGH netfilter: nf_tables: unconditionally bump set->nelems before insertion
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-2026-23274

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