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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-07-26 | 3 | Disclosure1General2 |
| 2026-07-27 | 2 | Disclosure2 |
CVE-2026-64530 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… https://www.cve.org/CVERecord?id=CVE-2026-64530
Post summary
A brief note indicating that CVE-2026-64530 in the Linux kernel has been resolved, with a link to the CVE record.
CVE-2026-64530 Use-After-Free in Linux Kernel TC Qdisc Handling of TC_ACT_CONSUMED https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-64530 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3
Post summary
The text announces CVE-2026-64530 as a use‑after‑free vulnerability in Linux Kernel TC Qdisc handling, providing links to further details but no proof of exploitation, patches, or false‑positive claims.
🚨 Linux’s traffic-control stack just served up a CVSS 9.8 use-after-free. RED, qevents and out-of-order fragments: a networking combo nobody ordered, but admins still have to patch. https://windowsforum.com/security-alerts.84/cve-2026-64530-linux-kernel-fix-stops-red-tc-use-after-free.440572/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #TrafficControl #LinuxSecurity #KernelVulnerabilities #Cve202664530 https://t.co/NoOniQVhxJ
Post summary
The tweet announces the discovery of CVE-2026-64530, a CVSS 9.8 use‑after‑free in Linux’s traffic‑control stack, and urges administrators to apply the forthcoming patch.
🚨Critical - Linux kernel TC qevent defrag UAF in cls_api (CVE-2026-64530) Linux kernel net/sched cls_api mishandles TC_ACT_CONSUMED in tcf_qevent_handle(), letting code keep using an skb after act_ct defrag transfers ownership to the defrag engine. With RED qdisc qevents + act_ct defrag on out-of-order fragments, red_enqueue() can touch/free a stolen skb, triggering use-after-free. 👉Affected: linux_kernel (net/sched cls_api; tc qevents + RED qdisc + act_ct defrag)
Post summary
The text announces a critical use‑after‑free vulnerability (CVE‑2026‑64530) in the Linux kernel TC subsystem, providing technical details but no PoC, exploit tool, or patch information.
The severity is increased for this new vulnerability affecting Linux Kernel (CVE-2026-64530) https://vuldb.com/vuln/383324
Post summary
The post announces a new Linux Kernel vulnerability (CVE-2026-64530) with an increased severity rating, but provides no additional technical or remediation details.