CVE-2021-47014

一、漏洞信息
 漏洞编号：[CVE-2021-47014](https://nvd.nist.gov/vuln/detail/CVE-2021-47014)
 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:net/sched: act_ct: fix wild memory access when clearing fragmentswhile testing re-assembly/re-fragmentation using act_ct, it s possible toobserve a crash like the following one: KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f] CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S                5.12.0-rc7+ #424 Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017 RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0 Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48 RSP: 0018:ffff888c31449db8 EFLAGS: 00010203 RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960 RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350 R10: 0000000000000003 R11: ffffed1186289350 R12: dffffc0000000000 R13: 000100000000040e R14: 0000000000000000 R15: ffff888155e02160 FS:  0000000000000000(0000) GS:ffff888c31440000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:  <IRQ>  inet_frag_destroy+0xa9/0x150  call_timer_fn+0x2d/0x180  run_timer_softirq+0x4fe/0xe70  __do_softirq+0x197/0x5a0  irq_exit_rcu+0x1de/0x200  sysvec_apic_timer_interrupt+0x6b/0x80  </IRQ>when act_ct temporarily stores an IP fragment, restoring the skb qdisc cbresults in putting random data in FRAG_CB(), and this causes those  wild memory accesses later, when the rbtree is purged. Never overwrite the skbcb in case tcf_ct_handle_fragments() returns -EINPROGRESS.
 漏洞公开时间：2024-02-28 17:15:38
 漏洞创建时间：2024-02-28 21:35:49
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47014
<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/0648941f4c8bbf8b4b6c0b270889ae7aa769b921 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f77bd544a6bbe69aa50d9ed09f13494cf36ff806 |  |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024022831-CVE-2021-47014-ffc7@gregkh/T/#u | https://bugzilla.redhat.com/show_bug.cgi?id=2266738 |

</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:net/sched: act_ct: fix wild memory access when clearing fragmentswhile testing re-assembly/re-fragmentation using act_ct, it s possible toobserve a crash like the following one: KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f] CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S                5.12.0-rc7+ #424 Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017 RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0 Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48 RSP: 0018:ffff888c31449db8 EFLAGS: 00010203 RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960 RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350 R10: 0000000000000003 R11: ffffed1186289350 R12: dffffc0000000000 R13: 000100000000040e R14: 0000000000000000 R15: ffff888155e02160 FS:  0000000000000000(0000) GS:ffff888c31440000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:  <IRQ>  inet_frag_destroy+0xa9/0x150  call_timer_fn+0x2d/0x180  run_timer_softirq+0x4fe/0xe70  __do_softirq+0x197/0x5a0  irq_exit_rcu+0x1de/0x200  sysvec_apic_timer_interrupt+0x6b/0x80  </IRQ>when act_ct temporarily stores an IP fragment, restoring the skb qdisc cbresults in putting random data in FRAG_CB(), and this causes those  wild memory accesses later, when the rbtree is purged. Never overwrite the skbcb in case tcf_ct_handle_fragments() returns -EINPROGRESS. 
 openEuler评分：
  7.1
 Vector：CVSS：2.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
 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

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