{"schema_version":"1.7.5","id":"CVE-2026-23270","published":"2026-03-18T17:54:43.803Z","modified":"2026-07-16T03:31:04.808902128Z","related":["ALSA-2026:13565","ALSA-2026:13566","ALSA-2026:19568","ALSA-2026:19569","ALSA-2026:21706","ALSA-2026:21745","SUSE-SU-2026:1573-1","SUSE-SU-2026:1661-1","SUSE-SU-2026:21114-1","SUSE-SU-2026:21123-1","SUSE-SU-2026:21230-1","SUSE-SU-2026:21237-1","SUSE-SU-2026:21255-1","SUSE-SU-2026:21352-1","SUSE-SU-2026:21361-1","openSUSE-SU-2026:20572-1"],"summary":"net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks\n\nAs Paolo said earlier [1]:\n\n\"Since the blamed commit below, classify can return TC_ACT_CONSUMED while\nthe current skb being held by the defragmentation engine. As reported by\nGangMin Kim, if such packet is that may cause a UaF when the defrag engine\nlater on tries to tuch again such packet.\"\n\nact_ct was never meant to be used in the egress path, however some users\nare attaching it to egress today [2]. Attempting to reach a middle\nground, we noticed that, while most qdiscs are not handling\nTC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we\naddress the issue by only allowing act_ct to bind to clsact/ingress\nqdiscs and shared blocks. That way it's still possible to attach act_ct to\negress (albeit only with clsact).\n\n[1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/\n[2] 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