CVE-2026-64530 Affecting kernel-rt-debug-modules-extra package, versions <0:6.12.0-211.42.1.el10_2


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.51% (41st percentile)

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  • Snyk IDSNYK-ROCKY10-KERNELRTDEBUGMODULESEXTRA-18511086
  • published3 Aug 2026
  • disclosed26 Jul 2026

Introduced: 26 Jul 2026

NewCVE-2026-64530  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:10 kernel-rt-debug-modules-extra to version 0:6.12.0-211.42.1.el10_2 or higher.
This issue was patched in RLSA-2026:49211.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-modules-extra package and not the kernel-rt-debug-modules-extra package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1