发布于3月6日3月6日 Members Ubuntu: (Multiple Advisories) (CVE-2024-35884): Linux kernel vulnerabilities Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/19/2024 Created 07/12/2024 Added 07/12/2024 Modified 09/20/2024 Description In the Linux kernel, the following vulnerability has been resolved: udp: do not accept non-tunnel GSO skbs landing in a tunnel When rx-udp-gro-forwarding is enabled UDP packets might be GROed when being forwarded. If such packets might land in a tunnel this can cause various issues and udp_gro_receive makes sure this isn't the case by looking for a matching socket. This is performed in udp4/6_gro_lookup_skb but only in the current netns. This is an issue with tunneled packets when the endpoint is in another netns. In such cases the packets will be GROed at the UDP level, which leads to various issues later on. The same thing can happen with rx-gro-list. We saw this with geneve packets being GROed at the UDP level. In such case gso_size is set; later the packet goes through the geneve rx path, the geneve header is pulled, the offset are adjusted and frag_list skbs are not adjusted with regard to geneve. When those skbs hit skb_fragment, it will misbehave. Different outcomes are possible depending on what the GROed skbs look like; from corrupted packets to kernel crashes. One example is a BUG_ON[1] triggered in skb_segment while processing the frag_list. Because gso_size is wrong (geneve header was pulled) skb_segment thinks there is "geneve header size" of data in frag_list, although it's in fact the next packet. The BUG_ON itself has nothing to do with the issue. This is only one of the potential issues. Looking up for a matching socket in udp_gro_receive is fragile: the lookup could be extended to all netns (not speaking about performances) but nothing prevents those packets from being modified in between and we could still not find a matching socket. It's OK to keep the current logic there as it should cover most cases but we also need to make sure we handle tunnel packets being GROed too early. This is done by extending the checks in udp_unexpected_gso: GSO packets lacking the SKB_GSO_UDP_TUNNEL/_CSUM bits and landing in a tunnel must be segmented. [1] kernel BUG at net/core/skbuff.c:4408! RIP: 0010:skb_segment+0xd2a/0xf70 __udp_gso_segment+0xaa/0x560 Solution(s) ubuntu-upgrade-linux-image-5-15-0-1035-xilinx-zynqmp ubuntu-upgrade-linux-image-5-15-0-1048-gkeop ubuntu-upgrade-linux-image-5-15-0-1058-ibm ubuntu-upgrade-linux-image-5-15-0-1058-raspi ubuntu-upgrade-linux-image-5-15-0-1060-intel-iotg ubuntu-upgrade-linux-image-5-15-0-1060-nvidia ubuntu-upgrade-linux-image-5-15-0-1060-nvidia-lowlatency ubuntu-upgrade-linux-image-5-15-0-1062-gke ubuntu-upgrade-linux-image-5-15-0-1062-kvm ubuntu-upgrade-linux-image-5-15-0-1063-oracle ubuntu-upgrade-linux-image-5-15-0-1064-gcp ubuntu-upgrade-linux-image-5-15-0-1065-aws ubuntu-upgrade-linux-image-5-15-0-1065-gcp ubuntu-upgrade-linux-image-5-15-0-1068-azure ubuntu-upgrade-linux-image-5-15-0-1068-azure-fde ubuntu-upgrade-linux-image-5-15-0-116-generic ubuntu-upgrade-linux-image-5-15-0-116-generic-64k ubuntu-upgrade-linux-image-5-15-0-116-generic-lpae ubuntu-upgrade-linux-image-5-15-0-116-lowlatency ubuntu-upgrade-linux-image-5-15-0-116-lowlatency-64k ubuntu-upgrade-linux-image-6-8-0-1006-gke ubuntu-upgrade-linux-image-6-8-0-1007-intel ubuntu-upgrade-linux-image-6-8-0-1007-raspi ubuntu-upgrade-linux-image-6-8-0-1008-ibm ubuntu-upgrade-linux-image-6-8-0-1008-oem ubuntu-upgrade-linux-image-6-8-0-1008-oracle ubuntu-upgrade-linux-image-6-8-0-1008-oracle-64k ubuntu-upgrade-linux-image-6-8-0-1009-nvidia ubuntu-upgrade-linux-image-6-8-0-1009-nvidia-64k ubuntu-upgrade-linux-image-6-8-0-1010-azure ubuntu-upgrade-linux-image-6-8-0-1010-azure-fde ubuntu-upgrade-linux-image-6-8-0-1010-gcp ubuntu-upgrade-linux-image-6-8-0-1011-aws ubuntu-upgrade-linux-image-6-8-0-38-generic ubuntu-upgrade-linux-image-6-8-0-38-generic-64k ubuntu-upgrade-linux-image-6-8-0-38-lowlatency ubuntu-upgrade-linux-image-6-8-0-38-lowlatency-64k ubuntu-upgrade-linux-image-aws ubuntu-upgrade-linux-image-aws-lts-22-04 ubuntu-upgrade-linux-image-azure ubuntu-upgrade-linux-image-azure-cvm ubuntu-upgrade-linux-image-azure-fde ubuntu-upgrade-linux-image-azure-fde-lts-22-04 ubuntu-upgrade-linux-image-azure-lts-22-04 ubuntu-upgrade-linux-image-gcp ubuntu-upgrade-linux-image-gcp-lts-22-04 ubuntu-upgrade-linux-image-generic ubuntu-upgrade-linux-image-generic-64k ubuntu-upgrade-linux-image-generic-64k-hwe-20-04 ubuntu-upgrade-linux-image-generic-64k-hwe-24-04 ubuntu-upgrade-linux-image-generic-hwe-20-04 ubuntu-upgrade-linux-image-generic-hwe-24-04 ubuntu-upgrade-linux-image-generic-lpae ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04 ubuntu-upgrade-linux-image-gke ubuntu-upgrade-linux-image-gke-5-15 ubuntu-upgrade-linux-image-gkeop ubuntu-upgrade-linux-image-gkeop-5-15 ubuntu-upgrade-linux-image-ibm ubuntu-upgrade-linux-image-ibm-classic ubuntu-upgrade-linux-image-ibm-lts-24-04 ubuntu-upgrade-linux-image-intel ubuntu-upgrade-linux-image-intel-iotg ubuntu-upgrade-linux-image-kvm ubuntu-upgrade-linux-image-lowlatency ubuntu-upgrade-linux-image-lowlatency-64k ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04 ubuntu-upgrade-linux-image-lowlatency-hwe-20-04 ubuntu-upgrade-linux-image-nvidia ubuntu-upgrade-linux-image-nvidia-64k ubuntu-upgrade-linux-image-nvidia-lowlatency ubuntu-upgrade-linux-image-oem-20-04 ubuntu-upgrade-linux-image-oem-20-04b ubuntu-upgrade-linux-image-oem-20-04c ubuntu-upgrade-linux-image-oem-20-04d ubuntu-upgrade-linux-image-oem-24-04 ubuntu-upgrade-linux-image-oem-24-04a ubuntu-upgrade-linux-image-oracle ubuntu-upgrade-linux-image-oracle-64k ubuntu-upgrade-linux-image-oracle-lts-22-04 ubuntu-upgrade-linux-image-raspi ubuntu-upgrade-linux-image-raspi-nolpae ubuntu-upgrade-linux-image-virtual ubuntu-upgrade-linux-image-virtual-hwe-20-04 ubuntu-upgrade-linux-image-virtual-hwe-24-04 ubuntu-upgrade-linux-image-xilinx-zynqmp References https://attackerkb.com/topics/cve-2024-35884 CVE - 2024-35884 USN-6893-1 USN-6893-2 USN-6893-3 USN-6898-1 USN-6898-2 USN-6898-3 USN-6898-4 USN-6917-1 USN-6918-1 USN-6919-1 USN-6927-1 USN-7019-1 View more
