CVSS 7.8 · High EPSS 0,13%
Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut CNA.
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/cc6bfb4a-4a2b-42d8-b9ce-7ef6644fb22b@ovn.org/
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 5.15.148 hingga sebelum 5.15.203 |
| linux | linux kernel | Versi 6.1.75 hingga sebelum 6.1.167 |
| linux | linux kernel | Versi 6.6.14 hingga sebelum 6.6.130 |
| linux | linux kernel | Versi 6.7.2 hingga sebelum 6.8 |
| linux | linux kernel | Versi 6.8 hingga sebelum 6.12.77 |
| linux | linux kernel | Versi 6.13 hingga sebelum 6.18.18 |
| linux | linux kernel | Versi 6.19 hingga sebelum 6.19.8 |
| linux | linux kernel | Versi 7.0 rc1 |
| linux | linux kernel | Versi 7.0 rc2 |