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

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act_ct绑定限制不足，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 21

VendorProduct Version RangeStatus
Linux Linux 172ba7d46c202e679f3ccb10264c67416aaeb1c4< bc4e5bb529823a09f02dbe96169de679a9db26e0 affected
0b5b831122fc3789fff75be433ba3e4dd7b779d4< fb3c380a54e33d1fd272cc342faa906d787d7ef1 affected
73f7da5fd124f2cda9161e2e46114915e6e82e97< 5a110ddcc99bda77a28598b3555fe009eaab3828 affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< 524ce8b4ea8f64900b6c52b6a28df74f6bc0801e affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< 380ad8b7c65ea7aa10ef2258297079ed5ac1f5b6 affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< 9deda0fcda5c1f388c5e279541850b71a2ccfcf4 affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< 11cb63b0d1a0685e0831ae3c77223e002ef18189 affected
f5346df0591d10bc948761ca854b1fae6d2ef441 affected
… +13 more rows
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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: CVE Program / CVE List V5
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: 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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 172ba7d46c202e679f3ccb10264c67416aaeb1c4 ~ bc4e5bb529823a09f02dbe96169de679a9db26e0 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-23270

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III. Intelligence Information for CVE-2026-23270

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Patches & Fixes for CVE-2026-23270 (6)

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

CVE-2026-23246 8.8 HIGH wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
CVE-2026-23268 7.8 HIGH apparmor: fix unprivileged local user can do privileged policy management
CVE-2026-23243 7.8 HIGH RDMA/umad: Reject negative data_len in ib_umad_write
CVE-2026-23245 7.8 HIGH net/sched: act_gate: snapshot parameters with RCU on replace
CVE-2026-23248 7.8 HIGH perf/core: Fix refcount bug and potential UAF in perf_mmap
CVE-2026-23253 7.8 HIGH media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
CVE-2025-71269 7.5 HIGH btrfs: do not free data reservation in fallback from inline due to -ENOSPC
CVE-2026-23242 7.5 HIGH RDMA/siw: Fix potential NULL pointer dereference in header processing
CVE-2025-71268 7.5 HIGH btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2026-23269 7.1 HIGH apparmor: validate DFA start states are in bounds in unpack_pdb
CVE-2026-23251 xfs: only call xf{array,blob}_destroy if we have a valid pointer
CVE-2025-71265 fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71266 fs: ntfs3: check return value of indx_find to avoid infinite loop
CVE-2025-71267 fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST
CVE-2026-23267 f2fs: fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic commit and
CVE-2026-23266 fbdev: rivafb: fix divide error in nv3_arb()
CVE-2026-23265 f2fs: fix to do sanity check on node footer in {read,write}_end_io
CVE-2026-23244 nvme: fix memory allocation in nvme_pr_read_keys()
CVE-2026-23264 Revert "drm/amd: Check if ASPM is enabled from PCIe subsystem"
CVE-2026-23247 tcp: secure_seq: add back ports to TS offset

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23270

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