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CVE-2026-80668— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 存在安全漏洞，该漏洞源于netfilter nf_conntrack_expect存在竞争条件问题，可能导致释放后重用攻击。

CVSS 9.8 · Critical EPSS 0.55% · P45

可能的 ATT&CK 技术 2 AI

T1400 T1598 · Phishing for Information

影响版本矩阵 16

厂商产品 版本范围状态
Linux Linux bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5< 7ec786f4230c2a9b2eaf97a2d45368933b49d2b2 affected
bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5< b8b09dc2bf35a00d4e0556b5d6308c7b917ebda2 affected
9e1196d27ef496f404c76f7a9d03761142d991c4 affected
5e1c1d22268ae710c238342c8030c21daf298168 affected
d52fa1fa7440676b8c238037a050ab008c22737f affected
f338ced0473849c9f6ed0b77ca99f1aab5826787 affected
497f99b26fffdc5635706d1b4811f1ed8ee21a5b affected
6.1.176< 6.2 affected
… +8 条更多
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一、 漏洞 CVE-2026-80668 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use conntrack GC to reap expectations This patch replaces the timer API by GC worker approach for expectations, as it already happened in many other subsystems. Use the existing conntrack GC worker to iterate over the local list of expectations in the master conntrack to reap expired expectations. Check IPS_HELPER_BIT to run GC for expectations, set it on for nft_ct expectation which nevers sets it. Hold the expectation spinlock while iterating over the master conntrack expectation list to synchronize with nf_ct_remove_expectations(). This also performs runtime packet path garbage collection through the expectation insertion and lookup functions while walking over one of the chains of the global expectation hashtables. Unconfirmed conntrack entries are skipped since ct->ext can be reallocated and dying are skipped since those will be gone soon. Set on IPS_HELPER_BIT if the helper ct extension is added, then the new GC worker does not need to bump the ct refcount to check if the ct->ext helper is available. This removes the extra bump on the refcount for expectation timers, this allows to remove several nf_ct_expect_put() calls after the unlink, after this update only refcount remains at 1 while on the expectation hashes. This patch implicitly addresses a race with the existing timer API allowing an expectation to access a stale exp->master pointer which has been already released when expectation removal loses races with an expiring timer, ie. timer_del() reporting false. Add a new NF_CT_EXPECT_DEAD flag to reap this expectation via GC. This is needed by nf_conntrack_unexpect_related() which is called in error paths to invalidate newly created expectations that has been added into the hashes. These expectactions cannot be inmediately released as GC or nf_ct_remove_expectations() could race to make it. On expectation insert, the runtime GC reaps stale expectations before checking the expectation limit set by policy. Set current timestamp in nf_ct_expect_alloc(), then add the expectation policy timeout (or custom timeout specified added on top of this) to specify the expectation lifetime.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 存在安全漏洞，该漏洞源于netfilter nf_conntrack_expect存在竞争条件问题，可能导致释放后重用攻击。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
Linux Linux bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5 ~ 7ec786f4230c2a9b2eaf97a2d45368933b49d2b2 -
Linux Linux 7.0 -

二、漏洞 CVE-2026-80668 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2026-80668 的情报信息

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CVE-2026-80668 补丁与修复 (2)

同批安全公告 · Linux · 2026-08-28 · 共 135 条

CVE-2026-80694 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80673 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80634 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80674 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80630 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80617 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80612 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80714 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80609 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80681 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80600 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-80671 9.3 CRITICAL Linux kernel 安全漏洞
CVE-2026-80693 9.3 CRITICAL Linux kernel 安全漏洞
CVE-2026-80684 9.3 CRITICAL Linux kernel 安全漏洞
CVE-2026-80603 9.1 CRITICAL Linux kernel 安全漏洞
CVE-2026-80670 9.1 CRITICAL Linux kernel 安全漏洞
CVE-2026-80683 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-80692 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-80672 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-80633 8.8 HIGH Linux kernel 安全漏洞

显示前 20 条，共 135 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80668

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