CVE-2024-43817

CVE Details

Release Date:

2024-08-17

Description

In the Linux kernel, the following vulnerability has been resolved:\nnet: missing check virtio\nTwo missing check in virtio_net_hdr_to_skb() allowed syzbot\nto crash kernels again\n1. After the skb_segment function the buffer may become non-linear\n(nr_frags != 0), but since the SKBTX_SHARED_FRAG flag is not set anywhere\nthe __skb_linearize function will not be executed, then the buffer will\nremain non-linear. Then the condition (offset >= skb_headlen(skb))\nbecomes true, which causes WARN_ON_ONCE in skb_checksum_help.\n2. The struct sk_buff and struct virtio_net_hdr members must be\nmathematically related.\n(gso_size) must be greater than (needed) otherwise WARN_ON_ONCE.\n(remainder) must be greater than (needed) otherwise WARN_ON_ONCE.\n(remainder) may be 0 if division is without remainder.\noffset+2 (4191) > skb_headlen() (1116)\nWARNING: CPU: 1 PID: 5084 at net/core/dev.c:3303 skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303\nModules linked in:\nCPU: 1 PID: 5084 Comm: syz-executor336 Not tainted 6.7.0-rc3-syzkaller-00014-gdf60cee26a2e #0\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023\nRIP: 0010:skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303\nCode: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 01 00 00 44 89 e2 2b 53 74 4c 89 ee 48 c7 c7 40 57 e9 8b e8 af 8f dd f8 90 <0f> 0b 90 90 e9 87 fe ff ff e8 40 0f 6e f9 e9 4b fa ff ff 48 89 ef\nRSP: 0018:ffffc90003a9f338 EFLAGS: 00010286\nRAX: 0000000000000000 RBX: ffff888025125780 RCX: ffffffff814db209\nRDX: ffff888015393b80 RSI: ffffffff814db216 RDI: 0000000000000001\nRBP: ffff8880251257f4 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000001 R12: 000000000000045c\nR13: 000000000000105f R14: ffff8880251257f0 R15: 000000000000105d\nFS: 0000555555c24380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000002000f000 CR3: 0000000023151000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\nip_do_fragment+0xa1b/0x18b0 net/ipv4/ip_output.c:777\nip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:584\nip_finish_output_gso net/ipv4/ip_output.c:286 [inline]\n__ip_finish_output net/ipv4/ip_output.c:308 [inline]\n__ip_finish_output+0x49c/0x650 net/ipv4/ip_output.c:295\nip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323\nNF_HOOK_COND include/linux/netfilter.h:303 [inline]\nip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433\ndst_output include/net/dst.h:451 [inline]\nip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129\niptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82\nipip6_tunnel_xmit net/ipv6/sit.c:1034 [inline]\nsit_tunnel_xmit+0xed2/0x28f0 net/ipv6/sit.c:1076\n__netdev_start_xmit include/linux/netdevice.h:4940 [inline]\nnetdev_start_xmit include/linux/netdevice.h:4954 [inline]\nxmit_one net/core/dev.c:3545 [inline]\ndev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3561\n__dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4346\ndev_queue_xmit include/linux/netdevice.h:3134 [inline]\npacket_xmit+0x257/0x380 net/packet/af_packet.c:276\npacket_snd net/packet/af_packet.c:3087 [inline]\npacket_sendmsg+0x24ca/0x5240 net/packet/af_packet.c:3119\nsock_sendmsg_nosec net/socket.c:730 [inline]\n__sock_sendmsg+0xd5/0x180 net/socket.c:745\n__sys_sendto+0x255/0x340 net/socket.c:2190\n__do_sys_sendto net/socket.c:2202 [inline]\n__se_sys_sendto net/socket.c:2198 [inline]\n__x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x40/0x110 arch/x86/entry/common.c:82\nentry_SYSCALL_64_after_hwframe+0x63/0x6b\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller

See more information about CVE-2024-43817 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12815	2024-11-11
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12815	2024-11-11