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CVE-2026-23270— net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

CVSS 7.8 · High EPSS 0.01% · P3
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I. Basic Information for CVE-2026-23270

Vulnerability Information
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Vulnerability Title
net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet." act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact). [1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/cc6bfb4a-4a2b-42d8-b9ce-7ef6644fb22b@ovn.org/
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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act_ct绑定限制不足，可能导致释放后重用。
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 172ba7d46c202e679f3ccb10264c67416aaeb1c4 ~ bc4e5bb529823a09f02dbe96169de679a9db26e0 -
LinuxLinux 6.8 -

II. Public POCs for CVE-2026-23270

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III. Intelligence Information for CVE-2026-23270

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Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

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CVE-2026-23252xfs: get rid of the xchk_xfile_*_descr calls
CVE-2025-71265fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71268btrfs: fix reservation leak in some error paths when inserting inline extent
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CVE-2025-71270LoongArch: Enable exception fixup for specific ADE subcode

Showing top 20 of 35 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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