CVE ID :CVE-2026-64530<\/p>\n
Published : July 26, 2026, 7:16 a.m. | 37\u00a0minutes ago<\/p>\n
Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net\/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle<\/p>\n
tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the
\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When
\nthat happens the skb is no longer owned by the caller and must not be
\ntouched again.<\/p>\n
tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the
\nswitch and returned the skb to the caller as if classification had
\npassed. The only qdisc that wires up qevents today is RED, via three call sites
\n(qe_mark on RED_PROB_MARK\/HARD_MARK, qe_early_drop on congestion_drop)
\nred_enqueue() was continuing to operate on an skb it no longer owns in this
\ncase — enqueueing it, dropping it, or updating statistics. Resulting in a UAF.<\/p>\n
tc qdisc add dev eth0 root handle 1: red … qevent early_drop block 10
\n tc filter add block 10 … action ct<\/p>\n
(with ct defrag enabled and traffic that produces out-of-order
\n fragments, e.g. a fragmented UDP stream)<\/p>\n
Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress
\nand egress fast paths do: treat it as stolen and return NULL without
\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be
\ndropped\/freed here, as it is no longer owned by us.<\/p>\n
Severity: 0.0 | NA<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID :CVE-2026-64530 Published : July 26, 2026, 7:16 a.m. | 37\u00a0minutes ago 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 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82556","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82556","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82556"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82556\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}