CVE-2024-44934

一、漏洞信息
 漏洞编号：[CVE-2024-44934](https://nvd.nist.gov/vuln/detail/CVE-2024-44934)
 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：7.8 High
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:net: bridge: mcast: wait for previous gc cycles when removing portsyzbot hit a use-after-free[1] which is caused because the bridge doesn tmake sure that all previous garbage has been collected when removing aport. What happens is:      CPU 1                   CPU 2 start gc cycle           remove port                         acquire gc lock first wait for lock                         call br_multicasg_gc() directly acquire lock now but    free port the port can be freed while grp timers still runningMake sure all previous gc cycles have finished by using flush_work beforefreeing the port.[1]  BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861  Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699  CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024  Call Trace:   <IRQ>   __dump_stack lib/dump_stack.c:88 [inline]   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114   print_address_description mm/kasan/report.c:377 [inline]   print_report+0xc3/0x620 mm/kasan/report.c:488   kasan_report+0xd9/0x110 mm/kasan/report.c:601   br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861   call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792   expire_timers kernel/time/timer.c:1843 [inline]   __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417   __run_timer_base kernel/time/timer.c:2428 [inline]   __run_timer_base kernel/time/timer.c:2421 [inline]   run_timer_base+0x111/0x190 kernel/time/timer.c:2437
 漏洞公开时间：2024-08-26 19:15:05
 漏洞创建时间：2024-08-27 03:42:36
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-44934
<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/0d8b26e10e680c01522d7cc14abe04c3265a928f |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-44934 | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-44934 | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-44934.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1229809 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024082641-CVE-2024-44934-a7fe@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2307891 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-44934 | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://git.kernel.org/linus/92c4ee25208d0f35dafc3213cdf355fbe449e078 (6.11-rc3) | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-44934 | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-44934 | https://ubuntu.com/security/CVE-2024-44934 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-44934 | https://ubuntu.com/security/CVE-2024-44934 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-44934 |
| amazon_linux_explore | https://access.redhat.com/security/cve/CVE-2024-44934 | https://explore.alas.aws.amazon.com/CVE-2024-44934.html |
| amazon_linux_explore | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44934 | https://explore.alas.aws.amazon.com/CVE-2024-44934.html |

</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  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f |  | nvd |
|  |  | https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f |  | nvd |
|  |  | https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 |  | nvd |
|  |  | https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 |  | nvd |
|  |  | https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce |  | nvd |
| linux |  | https://git.kernel.org/linus/92c4ee25208d0f35dafc3213cdf355fbe449e078 | https://git.kernel.org/linus/e12cec65b5546f19217e26aafb8add6e2fadca18 | ubuntu |

</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: bridge: mcast: wait for previous gc cycles when removing portsyzbot hit a use-after-free[1] which is caused because the bridge doesn tmake sure that all previous garbage has been collected when removing aport. What happens is:      CPU 1                   CPU 2 start gc cycle           remove port                         acquire gc lock first wait for lock                         call br_multicasg_gc() directly acquire lock now but    free port the port can be freed while grp timers still runningMake sure all previous gc cycles have finished by using flush_work beforefreeing the port.[1]  BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861  Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699  CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024  Call Trace:   <IRQ>   __dump_stack lib/dump_stack.c:88 [inline]   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114   print_address_description mm/kasan/report.c:377 [inline]   print_report+0xc3/0x620 mm/kasan/report.c:488   kasan_report+0xd9/0x110 mm/kasan/report.c:601   br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861   call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792   expire_timers kernel/time/timer.c:1843 [inline]   __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417   __run_timer_base kernel/time/timer.c:2428 [inline]   __run_timer_base kernel/time/timer.c:2421 [inline]   run_timer_base+0x111/0x190 kernel/time/timer.c:2437    
 openEuler评分：
  7.8
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-22.03-LTS-SP1(5.10.0):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):受影响
4.openEuler-24.03-LTS(6.6.0):受影响
5.openEuler-20.03-LTS-SP4(4.19.90):不受影响
6.master(6.6.0):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(6.6.0):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-2024-2124

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**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;**
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************************************************************************
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-SP4(4.19.90):
3.openEuler-22.03-LTS-SP1(5.10.0):
4.openEuler-22.03-LTS-SP3(5.10.0):
5.openEuler-22.03-LTS-SP4(5.10.0):
6.openEuler-24.03-LTS(6.6.0):
7.openEuler-24.03-LTS-Next(6.6.0):

修复是否涉及abi变化(是/否)：
1.master(6.1.0):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP1(5.10.0):
4.openEuler-22.03-LTS-SP3(5.10.0):
5.openEuler-22.03-LTS-SP4(5.10.0):
6.openEuler-24.03-LTS(6.6.0):
7.openEuler-24.03-LTS-Next(6.6.0):

-----------------------------------------------------------------------
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

参考网址	关联pr	状态	补丁链接
https://nvd.nist.gov/vuln/detail/CVE-2024-44934	None	None	https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f
https://ubuntu.com/security/CVE-2024-44934
https://www.opencve.io/cve/CVE-2024-44934	None	None	https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2024-44934
https://security-tracker.debian.org/tracker/CVE-2024-44934

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。
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-2024-44934

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

net: bridge: mcast: wait for previous gc cycles when removing port

syzbot hit a use-after-free[1] which is caused because the bridge doesn&#39;t
make sure that all previous garbage has been collected when removing a
port. What happens is:
      CPU 1                   CPU 2
 start gc cycle           remove port
                         acquire gc lock first
 wait for lock
                         call br_multicasg_gc() directly
 acquire lock now but    free port
 the port can be freed
 while grp timers still
 running

Make sure all previous gc cycles have finished by using flush_work before
freeing the port.

[1]
  BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861
  Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699

CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0
  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
  Call Trace:
   &lt;IRQ&gt;
   __dump_stack lib/dump_stack.c:88 [inline]
   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
   print_address_description mm/kasan/report.c:377 [inline]
   print_report+0xc3/0x620 mm/kasan/report.c:488
   kasan_report+0xd9/0x110 mm/kasan/report.c:601
   br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861
   call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792
   expire_timers kernel/time/timer.c:1843 [inline]
   __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417
   __run_timer_base kernel/time/timer.c:2428 [inline]
   __run_timer_base kernel/time/timer.c:2421 [inline]
   run_timer_base+0x111/0x190 kernel/time/timer.c:2437

The Linux kernel CVE team has assigned CVE-2024-44934 to this issue.

openEuler评分:(评分和向量)
3.9
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:不受影响
2.openEuler-22.03-LTS-SP1:不受影响
3.openEuler-22.03-LTS-SP3:不受影响
4.openEuler-22.03-LTS-SP4:不受影响
5.master(6.1.0):不受影响
6.openEuler-24.03-LTS:不受影响
7.openEuler-24.03-LTS-Next:不受影响

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

@ 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:net: bridge: mcast: wait for previous gc cycles when removing portsyzbot hit a use-after-free[1] which is caused because the bridge doesn&#39;tmake sure that all previous garbage has been collected when removing aport. What happens is:      CPU 1                   CPU 2 start gc cycle           remove port                         acquire gc lock first wait for lock                         call br_multicasg_gc() directly acquire lock now but    free port the port can be freed while grp timers still runningMake sure all previous gc cycles have finished by using flush_work beforefreeing the port.[1]  BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861  Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699  CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024  Call Trace:   &lt;IRQ&gt;   __dump_stack lib/dump_stack.c:88 [inline]   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114   print_address_description mm/kasan/report.c:377 [inline]   print_report+0xc3/0x620 mm/kasan/report.c:488   kasan_report+0xd9/0x110 mm/kasan/report.c:601   br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861   call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792   expire_timers kernel/time/timer.c:1843 [inline]   __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417   __run_timer_base kernel/time/timer.c:2428 [inline]   __run_timer_base kernel/time/timer.c:2421 [inline]   run_timer_base+0x111/0x190 kernel/time/timer.c:2437The Linux kernel CVE team has assigned CVE-2024-44934 to this issue.|
|已分析|2.openEulerScore|3.9|
|已分析|3.openEulerVector|AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L|
|已分析|4.受影响版本排查|openEuler-20.03-LTS-SP4:不受影响,openEuler-22.03-LTS-SP1:不受影响,openEuler-22.03-LTS-SP3:不受影响,openEuler-22.03-LTS-SP4:不受影响,master:不受影响,openEuler-24.03-LTS:不受影响,openEuler-24.03-LTS-Next:不受影响|
|已分析|5.修复是否涉及abi变化|openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP1:否,openEuler-22.03-LTS-SP3:否,master:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-Next:否,openEuler-22.03-LTS-SP4: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.**

CVE-2024-44934

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

net: bridge: mcast: wait for previous gc cycles when removing port

syzbot hit a use-after-free[1] which is caused because the bridge doesn&#39;t
make sure that all previous garbage has been collected when removing a
port. What happens is:
      CPU 1                   CPU 2
 start gc cycle           remove port
                         acquire gc lock first
 wait for lock
                         call br_multicasg_gc() directly
 acquire lock now but    free port
 the port can be freed
 while grp timers still
 running

Make sure all previous gc cycles have finished by using flush_work before
freeing the port.

[1]
  BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861
  Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699

CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0
  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
  Call Trace:
   &lt;IRQ&gt;
   __dump_stack lib/dump_stack.c:88 [inline]
   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
   print_address_description mm/kasan/report.c:377 [inline]
   print_report+0xc3/0x620 mm/kasan/report.c:488
   kasan_report+0xd9/0x110 mm/kasan/report.c:601
   br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861
   call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792
   expire_timers kernel/time/timer.c:1843 [inline]
   __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417
   __run_timer_base kernel/time/timer.c:2428 [inline]
   __run_timer_base kernel/time/timer.c:2421 [inline]
   run_timer_base+0x111/0x190 kernel/time/timer.c:2437

The Linux kernel CVE team has assigned CVE-2024-44934 to this issue.

openEuler评分:(评分和向量)
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

受影响版本排查(受影响/不受影响):
1.openEuler-20.03-LTS-SP4:不受影响
2.openEuler-22.03-LTS-SP1:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.master(6.1.0):不受影响
6.openEuler-24.03-LTS:受影响
7.openEuler-24.03-LTS-Next:不受影响

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

@ 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:net: bridge: mcast: wait for previous gc cycles when removing portsyzbot hit a use-after-free[1] which is caused because the bridge doesn&#39;tmake sure that all previous garbage has been collected when removing aport. What happens is:      CPU 1                   CPU 2 start gc cycle           remove port                         acquire gc lock first wait for lock                         call br_multicasg_gc() directly acquire lock now but    free port the port can be freed while grp timers still runningMake sure all previous gc cycles have finished by using flush_work beforefreeing the port.[1]  BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861  Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699  CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024  Call Trace:   &lt;IRQ&gt;   __dump_stack lib/dump_stack.c:88 [inline]   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114   print_address_description mm/kasan/report.c:377 [inline]   print_report+0xc3/0x620 mm/kasan/report.c:488   kasan_report+0xd9/0x110 mm/kasan/report.c:601   br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861   call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792   expire_timers kernel/time/timer.c:1843 [inline]   __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417   __run_timer_base kernel/time/timer.c:2428 [inline]   __run_timer_base kernel/time/timer.c:2421 [inline]   run_timer_base+0x111/0x190 kernel/time/timer.c:2437The Linux kernel CVE team has assigned CVE-2024-44934 to this issue.|
|已分析|2.openEulerScore|7.8|
|已分析|3.openEulerVector|AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H|
|已分析|4.受影响版本排查|openEuler-22.03-LTS-SP1:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-24.03-LTS:受影响,openEuler-20.03-LTS-SP4:不受影响,master:不受影响,openEuler-24.03-LTS-Next:不受影响|
|已分析|5.修复是否涉及abi变化|openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP1:否,openEuler-22.03-LTS-SP3:否,master:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-Next:否,openEuler-22.03-LTS-SP4:否|