CVE-2026-23270

In the Linux kernel, the following vulnerability has been resolved: net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks As Paolo said earlier [1]: "Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet." act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact). [1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/[email protected]/

• linux linux kernel (>= 5.15.148 < 5.15.203) • linux linux kernel (>= 6.1.75 < 6.1.167) • linux linux kernel (>= 6.6.14 < 6.6.130) • linux linux kernel (>= 6.7.2 < 6.8) • linux linux kernel (>= 6.8 < 6.12.77) • linux linux kernel (>= 6.13 < 6.18.18) • linux linux kernel (>= 6.19 < 6.19.8) • linux linux kernel 7.0