CVE-2023-53477

一、漏洞信息
 漏洞编号：[CVE-2023-53477](https://nvd.nist.gov/vuln/detail/CVE-2023-53477)
 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：N/A None
  Vector：CVSS：3.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:ipv6: Add lwtunnel encap size of all siblings in nexthop calculationIn function rt6_nlmsg_size(), the length of nexthop is calculatedby multipling the nexthop length of fib6_info and the number ofsiblings. However if the fib6_info has no lwtunnel but the siblingshave lwtunnels, the nexthop length is less than it should be, andit will trigger a warning in inet6_rt_notify() as follows:WARNING: CPU: 0 PID: 6082 at net/ipv6/route.c:6180 inet6_rt_notify+0x120/0x130......Call Trace: <TASK> fib6_add_rt2node+0x685/0xa30 fib6_add+0x96/0x1b0 ip6_route_add+0x50/0xd0 inet6_rtm_newroute+0x97/0xa0 rtnetlink_rcv_msg+0x156/0x3d0 netlink_rcv_skb+0x5a/0x110 netlink_unicast+0x246/0x350 netlink_sendmsg+0x250/0x4c0 sock_sendmsg+0x66/0x70 ___sys_sendmsg+0x7c/0xd0 __sys_sendmsg+0x5d/0xb0 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdcThis bug can be reproduced by script:ip -6 addr add 2002::2/64 dev ens2ip -6 route add 100::/64 via 2002::1 dev ens2 metric 100for i in 10 20 30 40 50 60 70;do	ip link add link ens2 name ipv_$i type ipvlan	ip -6 addr add 2002::$i/64 dev ipv_$i	ifconfig ipv_$i updonefor i in 10 20 30 40 50 60;do	ip -6 route append 100::/64 encap ip6 dst 2002::$i via 2002::1dev ipv_$i metric 100doneip -6 route append 100::/64 via 2002::1 dev ipv_70 metric 100This patch fixes it by adding nexthop_len of every siblings usingrt6_nh_nlmsg_size().
 漏洞公开时间：2025-10-01 20:15:50
 漏洞创建时间：2025-10-01 20:41:14
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2023-53477
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
|  | https://git.kernel.org/stable/c/4cc59f386991ec9374cb4bc83dbe1c0b5a95033f |  |
|  | https://lore.kernel.org/linux-cve-announce/2025100111-CVE-2023-53477-93d5@gregkh/T/#u |  |
|  | https://security-tracker.debian.org/tracker/CVE-2023-53477 |  |
|  | https://git.kernel.org/stable/c/aa75d826c221e8d48607aef33836cf872a159cf1 |  |
|  | https://ubuntu.com/security/CVE-2023-53477 |  |
|  | https://www.cve.org/CVERecord?id=CVE-2023-53477 |  |
|  | https://git.kernel.org/stable/c/e11e4d524eba2d3c8fdf897d7ce3853f7573bae9 |  |
|  | https://git.kernel.org/linus/4cc59f386991ec9374cb4bc83dbe1c0b5a95033f |  |
|  | https://bugzilla.redhat.com/show_bug.cgi?id=2400802 |  |
|  | https://nvd.nist.gov/vuln/detail/CVE-2023-53477 |  |
|  | https://lore.kernel.org/linux-cve-announce/2025100111-CVE-2023-53477-93d5@gregkh/T |  |
|  | https://git.kernel.org/stable/c/da26369377f0b671c14692e2d65ceb38131053e1 |  |
|  | https://git.kernel.org/stable/c/dcdddb5f490890d058ea1f194d661219e92fe88d |  |
|  | https://git.kernel.org/stable/c/aba298b35619213ca787d08d472049627d8cd012 |  |

</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:
  七彩瞬析开源风险感知平台
 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  |
| ------- | -------- | ------- | -------- | --------- |
| gregkh/linux |  | https://git.kernel.org/stable/c/aba298b35619213ca787d08d472049627d8cd012 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/da26369377f0b671c14692e2d65ceb38131053e1 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/dcdddb5f490890d058ea1f194d661219e92fe88d |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/e11e4d524eba2d3c8fdf897d7ce3853f7573bae9 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/aa75d826c221e8d48607aef33836cf872a159cf1 |  | ljqc |
| gregkh/linux |  | https://git.kernel.org/stable/c/4cc59f386991ec9374cb4bc83dbe1c0b5a95033f |  | ljqc |
|  |  | https://git.kernel.org/stable/c/4cc59f386991ec9374cb4bc83dbe1c0b5a95033f |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/aa75d826c221e8d48607aef33836cf872a159cf1 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/e11e4d524eba2d3c8fdf897d7ce3853f7573bae9 |  | cvelistv5 |
|  |  | https://git.kernel.org/linus/4cc59f386991ec9374cb4bc83dbe1c0b5a95033f |  | osv |
|  |  | https://git.kernel.org/stable/c/da26369377f0b671c14692e2d65ceb38131053e1 |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/dcdddb5f490890d058ea1f194d661219e92fe88d |  | cvelistv5 |
|  |  | https://git.kernel.org/stable/c/aba298b35619213ca787d08d472049627d8cd012 |  | cvelistv5 |

</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:ipv6: Add lwtunnel encap size of all siblings in nexthop calculationIn function rt6_nlmsg_size(), the length of nexthop is calculatedby multipling the nexthop length of fib6_info and the number ofsiblings. However if the fib6_info has no lwtunnel but the siblingshave lwtunnels, the nexthop length is less than it should be, andit will trigger a warning in inet6_rt_notify() as follows:WARNING: CPU: 0 PID: 6082 at net/ipv6/route.c:6180 inet6_rt_notify+0x120/0x130......Call Trace: <TASK> fib6_add_rt2node+0x685/0xa30 fib6_add+0x96/0x1b0 ip6_route_add+0x50/0xd0 inet6_rtm_newroute+0x97/0xa0 rtnetlink_rcv_msg+0x156/0x3d0 netlink_rcv_skb+0x5a/0x110 netlink_unicast+0x246/0x350 netlink_sendmsg+0x250/0x4c0 sock_sendmsg+0x66/0x70 ___sys_sendmsg+0x7c/0xd0 __sys_sendmsg+0x5d/0xb0 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdcThis bug can be reproduced by script:ip -6 addr add 2002::2/64 dev ens2ip -6 route add 100::/64 via 2002::1 dev ens2 metric 100for i in 10 20 30 40 50 60 70;doip link add link ens2 name ipv_$i type ipvlanip -6 addr add 2002::$i/64 dev ipv_$iifconfig ipv_$i updonefor i in 10 20 30 40 50 60;doip -6 route append 100::/64 encap ip6 dst 2002::$i via 2002::1dev ipv_$i metric 100doneip -6 route append 100::/64 via 2002::1 dev ipv_70 metric 100This patch fixes it by adding nexthop_len of every siblings usingrt6_nh_nlmsg_size().             
 openEuler评分：
  6.0
 Vector：CVSS：3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:H/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.master(6.12.33):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.openEuler-24.03-LTS:不受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:不受影响
8.openEuler-24.03-LTS-SP2:不受影响

修复是否涉及abi变化(是/否)：
  1.master(6.12.33):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.openEuler-22.03-LTS-SP4(5.10.0):否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否

原因说明：
  1.openEuler-20.03-LTS-SP4(4.19.90):正常修复
2.master(6.12.33):不受影响-漏洞代码不能被攻击者触发
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不能被攻击者触发
5.openEuler-24.03-LTS:不受影响-漏洞代码不能被攻击者触发
6.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1:不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-SP2:不受影响-漏洞代码不能被攻击者触发

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