Ubuntu: (Multiple Advisories) (CVE-2024-35839): Linux kernel (HWE) vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: replace physindev with physinif in nf_bridge_info An skb can be added to a neigh->arp_queue while waiting for an arp reply. Where original skb's skb->dev can be different to neigh's neigh->dev. For instance in case of bridging dnated skb from one veth to another, the skb would be added to a neigh->arp_queue of the bridge. As skb->dev can be reset back to nf_bridge->physindev and used, and as there is no explicit mechanism that prevents this physindev from been freed under us (for instance neigh_flush_dev doesn't cleanup skbs from different device's neigh queue) we can crash on e.g. this stack: arp_process neigh_update skb = __skb_dequeue(&neigh->arp_queue) neigh_resolve_output(..., skb) ... br_nf_dev_xmit br_nf_pre_routing_finish_bridge_slow skb->dev = nf_bridge->physindev br_handle_frame_finish Let's use plain ifindex instead of net_device link. To peek into the original net_device we will use dev_get_by_index_rcu(). Thus either we get device and are safe to use it or we don't get it and drop skb.
Solution(s)
- ubuntu-upgrade-linux-image-6-5-0-1015-starfive
- ubuntu-upgrade-linux-image-6-5-0-1017-laptop
- ubuntu-upgrade-linux-image-6-5-0-1018-raspi
- ubuntu-upgrade-linux-image-6-5-0-1021-aws
- ubuntu-upgrade-linux-image-6-5-0-1021-nvidia
- ubuntu-upgrade-linux-image-6-5-0-1021-nvidia-64k
- ubuntu-upgrade-linux-image-6-5-0-1022-azure
- ubuntu-upgrade-linux-image-6-5-0-1022-azure-fde
- ubuntu-upgrade-linux-image-6-5-0-1022-gcp
- ubuntu-upgrade-linux-image-6-5-0-1024-oem
- ubuntu-upgrade-linux-image-6-5-0-1024-oracle
- ubuntu-upgrade-linux-image-6-5-0-1024-oracle-64k
- ubuntu-upgrade-linux-image-6-5-0-41-generic
- ubuntu-upgrade-linux-image-6-5-0-41-generic-64k
- ubuntu-upgrade-linux-image-6-5-0-41-lowlatency
- ubuntu-upgrade-linux-image-6-5-0-41-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-fde
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
- ubuntu-upgrade-linux-image-generic-hwe-22-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-laptop-23-10
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-lowlatency-64k-hwe-22-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
- ubuntu-upgrade-linux-image-nvidia-6-5
- ubuntu-upgrade-linux-image-nvidia-64k-6-5
- ubuntu-upgrade-linux-image-nvidia-64k-hwe-22-04
- ubuntu-upgrade-linux-image-nvidia-hwe-22-04
- ubuntu-upgrade-linux-image-oem-22-04
- ubuntu-upgrade-linux-image-oem-22-04a
- ubuntu-upgrade-linux-image-oem-22-04b
- ubuntu-upgrade-linux-image-oem-22-04c
- ubuntu-upgrade-linux-image-oem-22-04d
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-raspi-nolpae
- ubuntu-upgrade-linux-image-starfive
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-22-04
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