CVE-2021-47557

一、漏洞信息
 漏洞编号：[CVE-2021-47557](https://nvd.nist.gov/vuln/detail/CVE-2021-47557)
 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 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:net/sched: sch_ets: don t peek at classes beyond  nbands when the number of DRR classes decreases, the round-robin active list cancontain elements that have already been freed in ets_qdisc_change(). As aconsequence, it s possible to see a NULL dereference crash, caused by theattempt to call cl->qdisc->ops->peek(cl->qdisc) when cl->qdisc is NULL: BUG: kernel NULL pointer dereference, address: 0000000000000018 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 910 Comm: mausezahn Not tainted 5.16.0-rc1+ #475 Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 RIP: 0010:ets_qdisc_dequeue+0x129/0x2c0 [sch_ets] Code: c5 01 41 39 ad e4 02 00 00 0f 87 18 ff ff ff 49 8b 85 c0 02 00 00 49 39 c4 0f 84 ba 00 00 00 49 8b ad c0 02 00 00 48 8b 7d 10 <48> 8b 47 18 48 8b 40 38 0f ae e8 ff d0 48 89 c3 48 85 c0 0f 84 9d RSP: 0000:ffffbb36c0b5fdd8 EFLAGS: 00010287 RAX: ffff956678efed30 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff9b938dc9 RDI: 0000000000000000 RBP: ffff956678efed30 R08: e2f3207fe360129c R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff956678efeac0 R13: ffff956678efe800 R14: ffff956611545000 R15: ffff95667ac8f100 FS:  00007f2aa9120740(0000) GS:ffff95667b800000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 000000011070c000 CR4: 0000000000350ee0 Call Trace:  <TASK>  qdisc_peek_dequeued+0x29/0x70 [sch_ets]  tbf_dequeue+0x22/0x260 [sch_tbf]  __qdisc_run+0x7f/0x630  net_tx_action+0x290/0x4c0  __do_softirq+0xee/0x4f8  irq_exit_rcu+0xf4/0x130  sysvec_apic_timer_interrupt+0x52/0xc0  asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0033:0x7f2aa7fc9ad4 Code: b9 ff ff 48 8b 54 24 18 48 83 c4 08 48 89 ee 48 89 df 5b 5d e9 ed fc ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <53> 48 83 ec 10 48 8b 05 10 64 33 00 48 8b 00 48 85 c0 0f 85 84 00 RSP: 002b:00007ffe5d33fab8 EFLAGS: 00000202 RAX: 0000000000000002 RBX: 0000561f72c31460 RCX: 0000561f72c31720 RDX: 0000000000000002 RSI: 0000561f72c31722 RDI: 0000561f72c31720 RBP: 000000000000002a R08: 00007ffe5d33fa40 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000561f7187e380 R13: 0000000000000000 R14: 0000000000000000 R15: 0000561f72c31460  </TASK> Modules linked in: sch_ets sch_tbf dummy rfkill iTCO_wdt intel_rapl_msr iTCO_vendor_support intel_rapl_common joydev virtio_balloon lpc_ich i2c_i801 i2c_smbus pcspkr ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel ahci libahci ghash_clmulni_intel serio_raw libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm_log dm_mod CR2: 0000000000000018Ensuring that  alist  was never zeroed [1] was not sufficient, we need toremove from the active list those elements that are no more SP nor DRR.[1] https://lore.kernel.org/netdev/60d274838bf09777f0371253416e8af71360bc08.1633609148.git.dcaratti@redhat.com/v3: fix race between ets_qdisc_change() and ets_qdisc_dequeue() delisting    DRR classes beyond  nbands  in ets_qdisc_change() with the qdisc lock    acquired, thanks to Cong Wang.v2: when a NULL qdisc is found in the DRR active list, try to dequeue skb    from the next list item.
 漏洞公开时间：2024-05-24 23:15:20
 漏洞创建时间：2024-05-24 18:26:44
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47557
<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/ae2659d2c670252759ee9c823c4e039c0e05a6f2 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/de6d25924c2a8c2988c6a385990cafbe742061bf |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47557 | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2021-47557 | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| suse_bugzilla | https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2 | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| suse_bugzilla | https://git.kernel.org/stable/c/de6d25924c2a8c2988c6a385990cafbe742061bf | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| suse_bugzilla | https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47557.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2283392 | https://bugzilla.suse.com/show_bug.cgi?id=1225468 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024052444-CVE-2021-47557-bc88@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2283392 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2021-47557 | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://git.kernel.org/linus/de6d25924c2a8c2988c6a385990cafbe742061bf (5.16-rc3) | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2 | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://git.kernel.org/stable/c/de6d25924c2a8c2988c6a385990cafbe742061bf | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2021-47557 | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2021-47557 | https://ubuntu.com/security/CVE-2021-47557 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2021-47557 | https://ubuntu.com/security/CVE-2021-47557 |

</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:
  其它
 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/de6d25924c2a8c2988c6a385990cafbe742061bf | https://git.kernel.org/linus/dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  Reserved.
 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):不受影响
2.openEuler-22.03-LTS-SP3(5.10.0):不受影响
3.openEuler-22.03-LTS-SP4(5.10.0):不受影响
4.master(6.6.0):不受影响
5.openEuler-24.03-LTS(6.6.0):不受影响
6.openEuler-24.03-LTS-Next(6.6.0):不受影响
7.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-SP3(5.10.0):否
3.master(6.6.0):否
4.openEuler-24.03-LTS(6.6.0):否
5.openEuler-24.03-LTS-Next(6.6.0):否
6.openEuler-22.03-LTS-SP4(5.10.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.master(6.6.0):不受影响-漏洞代码不能被攻击者触发
2.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
3.openEuler-20.03-LTS-SP4(4.19.90):不受影响-漏洞代码不存在
4.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不存在
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不存在
6.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不存在

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