CVE-2024-50045

一、漏洞信息
 漏洞编号：[CVE-2024-50045](https://nvd.nist.gov/vuln/detail/CVE-2024-50045)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：5.5 Medium
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:netfilter: br_netfilter: fix panic with metadata_dst skbFix a kernel panic in the br_netfilter module when sending untaggedtraffic via a VxLAN device.This happens during the check for fragmentation in br_nf_dev_queue_xmit.It is dependent on:1) the br_netfilter module being loaded;2) net.bridge.bridge-nf-call-iptables set to 1;3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port;4) untagged frames with size higher than the VxLAN MTU forwarded/floodedWhen forwarding the untagged packet to the VxLAN bridge port, beforethe netfilter hooks are called, br_handle_egress_vlan_tunnel is called andchanges the skb_dst to the tunnel dst. The tunnel_dst is a metadata typeof dst, i.e., skb_valid_dst(skb) is false, and metadata->dst.dev is NULL.Then in the br_netfilter hooks, in br_nf_dev_queue_xmit, there s a checkfor frames that needs to be fragmented: frames with higher MTU than theVxLAN device end up calling br_nf_ip_fragment, which in turns callip_skb_dst_mtu.The ip_dst_mtu tries to use the skb_dst(skb) as if it was a valid dstwith valid dst->dev, thus the crash.This case was never supported in the first place, so drop the packetinstead.PING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data.[  176.291791] Unable to handle kernel NULL pointer dereference atvirtual address 0000000000000110[  176.292101] Mem abort info:[  176.292184]   ESR = 0x0000000096000004[  176.292322]   EC = 0x25: DABT (current EL), IL = 32 bits[  176.292530]   SET = 0, FnV = 0[  176.292709]   EA = 0, S1PTW = 0[  176.292862]   FSC = 0x04: level 0 translation fault[  176.293013] Data abort info:[  176.293104]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000[  176.293488]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0[  176.293787]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0[  176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000[  176.294166] [0000000000000110] pgd=0000000000000000,p4d=0000000000000000[  176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP[  176.295252] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel vethbr_netfilter bridge stp llc ipv6 crct10dif_ce[  176.295923] CPU: 0 PID: 188 Comm: ping Not tainted6.8.0-rc3-g5b3fbd61b9d1 #2[  176.296314] Hardware name: linux,dummy-virt (DT)[  176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBSBTYPE=--)[  176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter][  176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter][  176.297636] sp : ffff800080003630[  176.297743] x29: ffff800080003630 x28: 0000000000000008 x27:ffff6828c49ad9f8[  176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24:00000000000003e8[  176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21:ffff6828c3b16d28[  176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18:0000000000000014[  176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15:0000000095744632[  176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12:ffffb7e137926a70[  176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 :0000000000000000[  176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 :f20e0100bebafeca[  176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 :0000000000000000[  176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 :ffff6828c7f918f0[  176.300889] Call trace:[  176.301123]  br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter][  176.301411]  br_nf_post_routing+0x2a8/0x3e4 [br_netfilter][  176.301703]  nf_hook_slow+0x48/0x124[  176.302060]  br_forward_finish+0xc8/0xe8 [bridge][  176.302371]  br_nf_hook_thresh+0x124/0x134 [br_netfilter][  176.302605]  br_nf_forward_finish+0x118/0x22c [br_netfilter][  176.302824]  br_nf_forward_ip.part.0+0x264/0x290 [br_netfilter][  176.303136]  br_nf_forward+0x2b8/0x4e0 [br_netfilter][  176.303359]  nf_hook_slow+0x48/0x124[  176.303---truncated---
 漏洞公开时间：2024-10-22 04:15:17
 漏洞创建时间：2024-10-22 05:00:47
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-50045
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-50045 | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-50045 | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4 | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568 | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803 | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81 | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-50045.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1231903 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-50045 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2024-50045 |
| mageia |  | http://advisories.mageia.org/MGASA-2024-0345.html |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  openBrain开源漏洞感知系统
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4 |  | nvd |
|  |  | https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568 |  | nvd |
|  |  | https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e |  | nvd |
|  |  | https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803 |  | nvd |
|  |  | https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81 |  | nvd |
|  |  | https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb |  | nvd |
| linux_kernel | 5.10.227 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cce8419b8168Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11538d039ac6 | linuxkernelcves |
| linux_kernel | 5.15.168 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=95c0cff5a1a5Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11538d039ac6 | linuxkernelcves |
| linux_kernel | 6.1.113 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=78ed917133b1Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11538d039ac6 | linuxkernelcves |
| linux_kernel | 6.6.57 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3453f5839420Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11538d039ac6 | linuxkernelcves |
| linux_kernel | 6.11.4 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=915717e0bb98Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11538d039ac6 | linuxkernelcves |
| linux_kernel | 6.12-rc3 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f9ff7665cd12Please | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11538d039ac6 | linuxkernelcves |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  In the Linux kernel, the following vulnerability has been resolved:netfilter: br_netfilter: fix panic with metadata_dst skbFix a kernel panic in the br_netfilter module when sending untaggedtraffic via a VxLAN device.This happens during the check for fragmentation in br_nf_dev_queue_xmit.It is dependent on:1) the br_netfilter module being loaded;2) net.bridge.bridge-nf-call-iptables set to 1;3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port;4) untagged frames with size higher than the VxLAN MTU forwarded/floodedWhen forwarding the untagged packet to the VxLAN bridge port, beforethe netfilter hooks are called, br_handle_egress_vlan_tunnel is called andchanges the skb_dst to the tunnel dst. The tunnel_dst is a metadata typeof dst, i.e., skb_valid_dst(skb) is false, and metadata->dst.dev is NULL.Then in the br_netfilter hooks, in br_nf_dev_queue_xmit, there s a checkfor frames that needs to be fragmented: frames with higher MTU than theVxLAN device end up calling br_nf_ip_fragment, which in turns callip_skb_dst_mtu.The ip_dst_mtu tries to use the skb_dst(skb) as if it was a valid dstwith valid dst->dev, thus the crash.This case was never supported in the first place, so drop the packetinstead.PING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data.[  176.291791] Unable to handle kernel NULL pointer dereference atvirtual address 0000000000000110[  176.292101] Mem abort info:[  176.292184]   ESR = 0x0000000096000004[  176.292322]   EC = 0x25: DABT (current EL), IL = 32 bits[  176.292530]   SET = 0, FnV = 0[  176.292709]   EA = 0, S1PTW = 0[  176.292862]   FSC = 0x04: level 0 translation fault[  176.293013] Data abort info:[  176.293104]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000[  176.293488]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0[  176.293787]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0[  176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000[  176.294166] [0000000000000110] pgd=0000000000000000,p4d=0000000000000000[  176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP[  176.295252] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel vethbr_netfilter bridge stp llc ipv6 crct10dif_ce[  176.295923] CPU: 0 PID: 188 Comm: ping Not tainted6.8.0-rc3-g5b3fbd61b9d1 #2[  176.296314] Hardware name: linux,dummy-virt (DT)[  176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBSBTYPE=--)[  176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter][  176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter][  176.297636] sp : ffff800080003630[  176.297743] x29: ffff800080003630 x28: 0000000000000008 x27:ffff6828c49ad9f8[  176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24:00000000000003e8[  176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21:ffff6828c3b16d28[  176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18:0000000000000014[  176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15:0000000095744632[  176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12:ffffb7e137926a70[  176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 :0000000000000000[  176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 :f20e0100bebafeca[  176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 :0000000000000000[  176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 :ffff6828c7f918f0[  176.300889] Call trace:[  176.301123]  br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter][  176.301411]  br_nf_post_routing+0x2a8/0x3e4 [br_netfilter][  176.301703]  nf_hook_slow+0x48/0x124[  176.302060]  br_forward_finish+0xc8/0xe8 [bridge][  176.302371]  br_nf_hook_thresh+0x124/0x134 [br_netfilter][  176.302605]  br_nf_forward_finish+0x118/0x22c [br_netfilter][  176.302824]  br_nf_forward_ip.part.0+0x264/0x290 [br_netfilter][  176.303136]  br_nf_forward+0x2b8/0x4e0 [br_netfilter][  176.303359]  nf_hook_slow+0x48/0x124[  176.303---truncated---
 openEuler评分：
  5.5
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP1(5.10.0):受影响
3.openEuler-22.03-LTS-SP3(5.10.0):受影响
4.openEuler-22.03-LTS-SP4(5.10.0):受影响
5.openEuler-24.03-LTS(6.6.0):受影响
6.master(6.6.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响
8.openEuler-24.03-LTS-SP1(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master(6.6.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-22.03-LTS-SP4(5.10.0):否
8.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.openEuler-24.03-LTS(6.6.0):正常修复
2.openEuler-22.03-LTS-SP1(5.10.0):暂不修复-漏洞仍在分析中
3.openEuler-22.03-LTS-SP3(5.10.0):暂不修复-漏洞仍在分析中
4.openEuler-22.03-LTS-SP4(5.10.0):暂不修复-漏洞仍在分析中
5.openEuler-20.03-LTS-SP4(4.19.90):不修复-超出修复范围
6.master(6.6.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不存在
8.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不存在

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-2494

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