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CVE-2026-64530— net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

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基金会开源的一款操作系统内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于tcf_qevent_handle函数未正确处理TC_ACT_CONSUMED返回值，导致释放后重用。

CVSS 9.8 · Critical EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 21

VendorProduct Version RangeStatus
Linux Linux 172ba7d46c202e679f3ccb10264c67416aaeb1c4< 5ed3d6f85991656667059d3fa5a1d683ac58c447 affected
0b5b831122fc3789fff75be433ba3e4dd7b779d4< f42e8134a3a1074b834a574d404352f867ba994a affected
73f7da5fd124f2cda9161e2e46114915e6e82e97< 447d493034a9cf7bf13a2abac86d0573d907ec2f affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< e1270e69dcf2c3512c453484178f2e9dc0db3f05 affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< 2140c2f3f2e7b066e1ae616ede8856cafd8015e9 affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< e28aedab9488343924d227b5a896faed67ce84d5 affected
3f14b377d01d8357eba032b4cabc8c1149b458b6< a8a02897f2b479127db261de05cbf0c28b98d159 affected
f5346df0591d10bc948761ca854b1fae6d2ef441 affected
… +13 more rows
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I. Basic Information for CVE-2026-64530

Vulnerability Information
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Vulnerability Title
net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the defragmentation engine (e.g. act_ct on out-of-order fragments). When that happens the skb is no longer owned by the caller and must not be touched again. tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the switch and returned the skb to the caller as if classification had passed. The only qdisc that wires up qevents today is RED, via three call sites (qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop) red_enqueue() was continuing to operate on an skb it no longer owns in this case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF. tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10 tc filter add block 10 ... action ct (with ct defrag enabled and traffic that produces out-of-order fragments, e.g. a fragmented UDP stream) Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress and egress fast paths do: treat it as stolen and return NULL without touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be dropped/freed here, as it is no longer owned by us.
Source: 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
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基金会开源的一款操作系统内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于tcf_qevent_handle函数未正确处理TC_ACT_CONSUMED返回值，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 ~ 5ed3d6f85991656667059d3fa5a1d683ac58c447 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-64530

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III. Intelligence Information for CVE-2026-64530

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Patches & Fixes for CVE-2026-64530 (7)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64530

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