CVE-2021-47036

一、漏洞信息
 漏洞编号：[CVE-2021-47036](https://nvd.nist.gov/vuln/detail/CVE-2021-47036)
 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
 CVSS V2.0分值：
  BaseScore：0.0 Low
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:udp: skip L4 aggregation for UDP tunnel packetsIf NETIF_F_GRO_FRAGLIST or NETIF_F_GRO_UDP_FWD are enabled, and thereare UDP tunnels available in the system, udp_gro_receive() could end-updoing L4 aggregation (either SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST) atthe outer UDP tunnel level for packets effectively carrying and UDPtunnel header.That could cause inner protocol corruption. If e.g. the relevantpackets carry a vxlan header, different vxlan ids will be ignored/aggregated to the same GSO packet. Inner headers will be ignored, too,so that e.g. TCP over vxlan push packets will be held in the GROengine till the next flush, etc.Just skip the SKB_GSO_UDP_L4 and SKB_GSO_FRAGLIST code path if thecurrent packet could land in a UDP tunnel, and let udp_gro_receive()do GRO via udp_sk(sk)->gro_receive.The check implemented in this patch is broader than what is strictlyneeded, as the existing UDP tunnel could be e.g. configured on top ofa different device: we could end-up skipping GRO at-all for some packets.Anyhow, that is a very thin corner case and covering it will add quitea bit of complexity.v1 -> v2: - hopefully clarify the commit message
 漏洞公开时间：2024-02-28 17:15:39
 漏洞创建时间：2024-02-28 23:16:13
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47036
<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/18f25dc399901426dff61e676ba603ff52c666f7 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/450687386cd16d081b58cd7a342acff370a96078 |  |

</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>

无
</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:udp: skip L4 aggregation for UDP tunnel packetsIf NETIF_F_GRO_FRAGLIST or NETIF_F_GRO_UDP_FWD are enabled, and thereare UDP tunnels available in the system, udp_gro_receive() could end-updoing L4 aggregation (either SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST) atthe outer UDP tunnel level for packets effectively carrying and UDPtunnel header.That could cause inner protocol corruption. If e.g. the relevantpackets carry a vxlan header, different vxlan ids will be ignored/aggregated to the same GSO packet. Inner headers will be ignored, too,so that e.g. TCP over vxlan push packets will be held in the GROengine till the next flush, etc.Just skip the SKB_GSO_UDP_L4 and SKB_GSO_FRAGLIST code path if thecurrent packet could land in a UDP tunnel, and let udp_gro_receive()do GRO via udp_sk(sk)->gro_receive.The check implemented in this patch is broader than what is strictlyneeded, as the existing UDP tunnel could be e.g. configured on top ofa different device: we could end-up skipping GRO at-all for some packets.Anyhow, that is a very thin corner case and covering it will add quitea bit of complexity.v1 -> v2: - hopefully clarify the commit message  
 openEuler评分：
  5.3
 Vector：CVSS：2.0/AV:L/AC:L/PR:L/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-22.03-LTS(5.10.0):受影响
2.openEuler-22.03-LTS-SP1(5.10.0):受影响
3.openEuler-22.03-LTS-SP2(5.10.0):受影响
4.openEuler-22.03-LTS-SP3:受影响
5.openEuler-22.03-LTS-Next(5.10.0):受影响
6.openEuler-20.03-LTS-SP1(4.19.90):不受影响
7.openEuler-20.03-LTS-SP4:不受影响
8.master(6.1.0):不受影响
9.openEuler-24.03-LTS:不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS(5.10.0):否
4.openEuler-22.03-LTS-SP1(5.10.0):否
5.openEuler-22.03-LTS-SP2(5.10.0):否
6.openEuler-22.03-LTS-SP3:否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next(5.10.0):否
9.openEuler-24.03-LTS:否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-1349

@yangyingliang ,@gatieme ,@jiaoff ,@guohaocs2c ,@hanjun-guo ,@woqidaideshi ,@newbeats ,@zhangyi089 ,@colyli ,@thundertown ,@htforge ,@chiqijun ,@lengchao ,@zhujianwei001 ,@kylin-mayukun ,@wangxiongfeng ,@wkfxxx ,@SuperSix173 ,@jentlestea ,@oskernel0719 
**issue处理注意事项:** 
**1. 当前issue受影响的分支提交pr时, 须在pr描述中填写当前issue编号进行关联, 否则无法关闭当前issue;**
**2. 模板内容需要填写完整, 无论是受影响或者不受影响都需要填写完整内容,未引入的分支不需要填写, 否则无法关闭当前issue;**
**3. 以下为模板中需要填写完整的内容, 请复制到评论区回复, 注: 内容的标题名称(影响性分析说明, openEuler评分, 受影响版本排查(受影响/不受影响), 修复是否涉及abi变化(是/否))不能省略,省略后cve-manager将无法正常解析填写内容.**
************************************************************************
影响性分析说明:

openEuler评分: (评分和向量)

受影响版本排查(受影响/不受影响): 
1.master(6.1.0):
2.openEuler-20.03-LTS-SP1(4.19.90):
3.openEuler-20.03-LTS-SP4(4.19.90):
4.openEuler-22.03-LTS(5.10.0):
5.openEuler-22.03-LTS-Next(5.10.0):
6.openEuler-22.03-LTS-SP1(5.10.0):
7.openEuler-22.03-LTS-SP2(5.10.0):
8.openEuler-22.03-LTS-SP3(5.10.0):

修复是否涉及abi变化(是/否)：
1.master(6.1.0):
2.openEuler-20.03-LTS-SP1(4.19.90):
3.openEuler-20.03-LTS-SP4(4.19.90):
4.openEuler-22.03-LTS(5.10.0):
5.openEuler-22.03-LTS-Next(5.10.0):
6.openEuler-22.03-LTS-SP1(5.10.0):
7.openEuler-22.03-LTS-SP2(5.10.0):
8.openEuler-22.03-LTS-SP3(5.10.0):

-----------------------------------------------------------------------
issue处理具体操作请参考: 
https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
pr关联issue具体操作请参考:
https://gitee.com/help/articles/4142

<table><tr><th white-space: nowrap;>参考网址</th> <th white-space: nowrap;>关联pr</th> <th white-space: nowrap;>状态</th> <th white-space: nowrap;>补丁链接</th></tr><tr><td rowspan="1">https://nvd.nist.gov/vuln/detail/CVE-2021-47036</td><td>None</td><td>None</td><td><a href=https://git.kernel.org/stable/c/18f25dc399901426dff61e676ba603ff52c666f7>https://git.kernel.org/stable/c/18f25dc399901426dff61e676ba603ff52c666f7</a><br /><a href=https://git.kernel.org/stable/c/450687386cd16d081b58cd7a342acff370a96078>https://git.kernel.org/stable/c/450687386cd16d081b58cd7a342acff370a96078</a></td></tr><tr><td rowspan="1">https://ubuntu.com/security/CVE-2021-47036</td><td>None</td><td>None</td><td><a href=https://discourse.ubuntu.com/c/ubuntu-pro>https://discourse.ubuntu.com/c/ubuntu-pro</a></td></tr><tr><td rowspan="1">https://www.opencve.io/cve/CVE-2021-47036</td><td>None</td><td>None</td><td><a href=https://git.kernel.org/stable/c/18f25dc399901426dff61e676ba603ff52c666f7>https://git.kernel.org/stable/c/18f25dc399901426dff61e676ba603ff52c666f7</a><br /><a href=https://git.kernel.org/stable/c/450687386cd16d081b58cd7a342acff370a96078>https://git.kernel.org/stable/c/450687386cd16d081b58cd7a342acff370a96078</a></td></tr><tr><td>https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2021-47036</td><td></td><td></td><td></td></tr><tr><td>https://security-tracker.debian.org/tracker/CVE-2021-47036</td><td></td><td></td><td></td></tr></table>

> 说明：补丁链接仅供初步排查参考，实际可用性请人工再次确认，补丁下载验证可使用[CVE补丁工具](https://gitee.com/openeuler/cve-manager/blob/master/cve-agency-manager/cve_tracking/README.md)。
若补丁不准确，烦请在此issue下评论 '/report-patch 参考网址 补丁链接1,补丁链接2' 反馈正确信息，便于我们不断优化工具，不胜感激。
如 /report-patch https://security-tracker.debian.org/tracker/CVE-2021-3997 https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1

CVE-2021-47036

影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:

udp: skip L4 aggregation for UDP tunnel packets

If NETIF_F_GRO_FRAGLIST or NETIF_F_GRO_UDP_FWD are enabled, and there
are UDP tunnels available in the system, udp_gro_receive() could end-up
doing L4 aggregation (either SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST) at
the outer UDP tunnel level for packets effectively carrying and UDP
tunnel header.

That could cause inner protocol corruption. If e.g. the relevant
packets carry a vxlan header, different vxlan ids will be ignored/
aggregated to the same GSO packet. Inner headers will be ignored, too,
so that e.g. TCP over vxlan push packets will be held in the GRO
engine till the next flush, etc.

Just skip the SKB_GSO_UDP_L4 and SKB_GSO_FRAGLIST code path if the
current packet could land in a UDP tunnel, and let udp_gro_receive()
do GRO via udp_sk(sk)->gro_receive.

The check implemented in this patch is broader than what is strictly
needed, as the existing UDP tunnel could be e.g. configured on top of
a different device: we could end-up skipping GRO at-all for some packets.

Anyhow, that is a very thin corner case and covering it will add quite
a bit of complexity.

v1 -> v2:
 - hopefully clarify the commit message

openEuler评分:(评分和向量)
5.3
CVSS:3.1/AV:L/AC:L/PR:L/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-SP1(4.19.90):不受影响
2.openEuler-20.03-LTS-SP4:不受影响
3.openEuler-22.03-LTS:受影响
4.openEuler-22.03-LTS-SP1:受影响
5.openEuler-22.03-LTS-SP2:受影响
6.openEuler-22.03-LTS-SP3:受影响
7.master(6.1.0):不受影响
8.openEuler-22.03-LTS-Next:受影响
9.openEuler-24.03-LTS:不受影响

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS:否
4.openEuler-22.03-LTS-SP1:否
5.openEuler-22.03-LTS-SP2:否
6.openEuler-22.03-LTS-SP3:否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next:否
9.openEuler-24.03-LTS:否

@CTC-XiboWang 经过 cve-manager 解析, 已分析的内容如下表所示:
| 状态  | 需分析 | 内容 |
|:--:|:--:|---------|
|已分析|1.影响性分析说明|In the Linux kernel, the following vulnerability has been resolved:udp: skip L4 aggregation for UDP tunnel packetsIf NETIF_F_GRO_FRAGLIST or NETIF_F_GRO_UDP_FWD are enabled, and thereare UDP tunnels available in the system, udp_gro_receive() could end-updoing L4 aggregation (either SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST) atthe outer UDP tunnel level for packets effectively carrying and UDPtunnel header.That could cause inner protocol corruption. If e.g. the relevantpackets carry a vxlan header, different vxlan ids will be ignored/aggregated to the same GSO packet. Inner headers will be ignored, too,so that e.g. TCP over vxlan push packets will be held in the GROengine till the next flush, etc.Just skip the SKB_GSO_UDP_L4 and SKB_GSO_FRAGLIST code path if thecurrent packet could land in a UDP tunnel, and let udp_gro_receive()do GRO via udp_sk(sk)->gro_receive.The check implemented in this patch is broader than what is strictlyneeded, as the existing UDP tunnel could be e.g. configured on top ofa different device: we could end-up skipping GRO at-all for some packets.Anyhow, that is a very thin corner case and covering it will add quitea bit of complexity.v1 -> v2: - hopefully clarify the commit message|
|已分析|2.openEulerScore|5.3|
|已分析|3.openEulerVector|AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L|
|已分析|4.受影响版本排查|openEuler-22.03-LTS:受影响,openEuler-22.03-LTS-SP1:受影响,openEuler-22.03-LTS-SP2:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-22.03-LTS-Next:受影响,openEuler-20.03-LTS-SP1:不受影响,openEuler-20.03-LTS-SP4:不受影响,master:不受影响,openEuler-24.03-LTS:不受影响|
|已分析|5.修复是否涉及abi变化|openEuler-20.03-LTS-SP1:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS:否,openEuler-22.03-LTS-SP1:否,openEuler-22.03-LTS-SP2:否,openEuler-22.03-LTS-SP3:否,master:否,openEuler-22.03-LTS-Next:否,openEuler-24.03-LTS:否|

**请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.**

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