CVE-2021-47515

一、漏洞信息
 漏洞编号：[CVE-2021-47515](https://nvd.nist.gov/vuln/detail/CVE-2021-47515)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 CVSS V2.0分值：
  BaseScore：0.0 None
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:seg6: fix the iif in the IPv6 socket control blockWhen an IPv4 packet is received, the ip_rcv_core(...) sets the receivinginterface index into the IPv4 socket control block (v5.16-rc4,net/ipv4/ip_input.c line 510):    IPCB(skb)->iif = skb->skb_iif;If that IPv4 packet is meant to be encapsulated in an outer IPv6+SRHheader, the seg6_do_srh_encap(...) performs the required encapsulation.In this case, the seg6_do_srh_encap function clears the IPv6 socket controlblock (v5.16-rc4 net/ipv6/seg6_iptunnel.c line 163):    memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));The memset(...) was introduced in commit ef489749aae5 ( ipv6: sr: clearIP6CB(skb) on SRH ip4ip6 encapsulation ) a long time ago (2019-01-29).Since the IPv6 socket control block and the IPv4 socket control block sharethe same memory area (skb->cb), the receiving interface index info is lost(IP6CB(skb)->iif is set to zero).As a side effect, that condition triggers a NULL pointer dereference ifcommit 0857d6f8c759 ( ipv6: When forwarding count rx stats on the orignetdev ) is applied.To fix that issue, we set the IP6CB(skb)->iif with the index of thereceiving interface once again.
 漏洞公开时间：2024-05-24 23:15:12
 漏洞创建时间：2024-06-24 06:00:33
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47515
<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/6431e71093f3da586a00c6d931481ffb0dc2db0e |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47515 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47515.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0e | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2021-47515 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2283436 | https://bugzilla.suse.com/show_bug.cgi?id=1225426 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024052431-CVE-2021-47515-5c06@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2283436 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2021-47515 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/linus/ae68d93354e5bf5191ee673982251864ea24dd5c (5.16-rc5) | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0e | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2021-47515 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2021-47515 | https://ubuntu.com/security/CVE-2021-47515 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2021-47515 | https://ubuntu.com/security/CVE-2021-47515 |
| cve_search |  | https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3 |
| cve_search |  | https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0e |
| cve_search |  | https://git.kernel.org/stable/c/ef8804e47c0a44ae106ead1740408af5ea6c6ee9 |
| cve_search |  | https://git.kernel.org/stable/c/666521b3852d2b2f52d570f9122b1e4b50d96831 |
| cve_search |  | https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1 |
| cve_search |  | https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c |

</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  |
| ------- | -------- | ------- | -------- | --------- |
| linux |  | https://git.kernel.org/linus/ae68d93354e5bf5191ee673982251864ea24dd5c | https://git.kernel.org/linus/ef489749aae508e6f17886775c075f12ff919fb1 | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
    Reserved. 
 openEuler评分：
  3.9
 Vector：CVSS：2.0/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
 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):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-24.03-LTS(6.6.0):不受影响
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响
6.master(6.1.0):不受影响
7.openEuler-24.03-LTS-Next(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(6.1.0):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

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-1835

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