CVE-2022-41849

一、漏洞信息
漏洞编号：CVE-2022-41849
漏洞归属组件：kernel
漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0
CVSS V3.0分值：
BaseScore：4.2 Medium
Vector：CVSS：3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
漏洞简述：
drivers/video/fbdev/smscufx.c in the Linux kernel through 5.19.12 has a race condition and resultant use-after-free if a physically proximate attacker removes a USB device while calling open(), aka a race condition between ufx_ops_open and ufx_usb_disconnect.
漏洞公开时间：2022-09-30 14:15:00
漏洞创建时间：2022-09-30 17:05:36
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2022-41849

更多参考(点击展开)

参考来源	参考链接	来源链接
nvd	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/
nvd	https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html
nvd	https://lists.debian.org/debian-lts-announce/2022/12/msg00034.html
redhat	https://access.redhat.com/security/cve/CVE-2022-41849
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-41849	https://bugzilla.suse.com/show_bug.cgi?id=1203992
suse_bugzilla	https://www.cve.org/CVERecord?id=CVE-2022-41849	https://bugzilla.suse.com/show_bug.cgi?id=1203992
suse_bugzilla	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/	https://bugzilla.suse.com/show_bug.cgi?id=1203992
redhat_bugzilla	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/	https://bugzilla.redhat.com/show_bug.cgi?id=2135327
redhat_bugzilla	https://access.redhat.com/security/cve/cve-2022-41849	https://bugzilla.redhat.com/show_bug.cgi?id=2135327
ubuntu	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41849	https://ubuntu.com/security/CVE-2022-41849
ubuntu	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/	https://ubuntu.com/security/CVE-2022-41849
ubuntu	https://nvd.nist.gov/vuln/detail/CVE-2022-41849	https://ubuntu.com/security/CVE-2022-41849
ubuntu	https://launchpad.net/bugs/cve/CVE-2022-41849	https://ubuntu.com/security/CVE-2022-41849
ubuntu	https://security-tracker.debian.org/tracker/CVE-2022-41849	https://ubuntu.com/security/CVE-2022-41849
debian		https://security-tracker.debian.org/tracker/CVE-2022-41849
cve_search		https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/
cve_search		https://lists.debian.org/debian-lts-announce/2022/12/msg00031.html
mageia		http://advisories.mageia.org/MGASA-2022-0443.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2257.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2264.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2284.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2285.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2286.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2287.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2288.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2289.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2304.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2343.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2344.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2345.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2816.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2817.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-2819.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
amazon_linux	https://alas.aws.amazon.com/cve/html/CVE-2022-3037.html	https://alas.aws.amazon.com/ALAS-2022-1639.html
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-41849
suse_bugzilla	https://www.cve.org/CVERecord?id=CVE-2022-41849
suse_bugzilla	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/
redhat_bugzilla	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/
redhat_bugzilla	https://bugzilla.redhat.com/show_bug.cgi?id=2135327
debian	https://security-tracker.debian.org/tracker/CVE-2022-41849
nvd	https://lore.kernel.org/all/20220925133243.GA383897@ubuntu/T/

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：

详情(点击展开)

无

二、漏洞分析结构反馈
影响性分析说明：
drivers/video/fbdev/smscufx.c in the Linux kernel through 5.19.12 has a race condition and resultant use-after-free if a physically proximate attacker removes a USB device while calling open(), aka a race condition between ufx_ops_open and ufx_usb_disconnect.
openEuler评分：
4.2
Vector：CVSS：3.0/AV:P/AC:H/PR:N/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-22.03-LTS:受影响
2.openEuler-20.03-LTS-SP1(4.19.90):受影响
3.openEuler-20.03-LTS-SP3(4.19.90):受影响
4.openEuler-22.09:受影响

修复是否涉及abi变化(是/否)：
1.openEuler-22.03-LTS:否
2.openEuler-20.03-LTS-SP1(4.19.90):否
3.openEuler-20.03-LTS-SP3(4.19.90):否
4.openEuler-22.09:否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2022-2026

Hi openeuler-ci-bot, welcome to the openEuler Community.
I'm the Bot here serving you. You can find the instructions on how to interact with me at Here.
If you have any questions, please contact the SIG: Kernel, and any of the maintainers: @Xie XiuQi , @YangYingliang , @成坚 (CHENG Jian) , @jiaoff , @AlexGuo , @hanjun-guo , @woqidaideshi , @zhengzengkai , @Jackie Liu , @Zhang Yi , @colyli , @ThunderTown , @htforge , @Chiqijun , @冷嘲啊 , @zhujianwei001 , @kylin-mayukun , @wangxiongfeng , @Kefeng , @SuperSix173 , @WangShaoBo , @Zheng Zucheng , @lujialin , @陈结松 , @刘恺 , @whoisxxx , @wuxu_buque , @koulihong , @柳歆 , @朱科潜 , @Xu Kuohai , @Lingmingqiang , @juntian , @OSSIM , @岳海兵 , @郑振鹏 , @刘勇强 , @yuzenghui , @Qiuuuuu

@Xie XiuQi ,@YangYingliang ,@成坚 (CHENG Jian) ,@jiaoff ,@AlexGuo ,@hanjun-guo ,@woqidaideshi ,@zhengzengkai ,@Jackie Liu ,@Zhang Yi ,@colyli ,@ThunderTown ,@htforge ,@Chiqijun ,@冷嘲啊 ,@zhujianwei001 ,@kylin-mayukun ,@wangxiongfeng ,@Kefeng ,@SuperSix173
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.openEuler-20.03-LTS-SP1(4.19.90):
2.openEuler-20.03-LTS-SP3(4.19.90):
3.openEuler-22.03-LTS:
4.openEuler-22.09:

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP1(4.19.90):
2.openEuler-20.03-LTS-SP3(4.19.90):
3.openEuler-22.03-LTS:
4.openEuler-22.09:

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://bugzilla.redhat.com/show_bug.cgi?id=CVE-2022-41849
https://www.opencve.io/cve/CVE-2022-41849
https://security-tracker.debian.org/tracker/CVE-2022-41849
https://ubuntu.com/security/CVE-2022-41849
http://www.cnnvd.org.cn/web/vulnerability/queryLds.tag?qcvCnnvdid=CVE-2022-41849

说明：抱歉，当前工具暂未找到推荐补丁，请人工查找或者之后评论'/find-patch'尝试再次查找。
若人工查找到补丁，烦请在此issue下评论 '/report-patch 参考网址补丁链接1,补丁链接2' 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-2022-41849
I5U1NZ

影响性分析说明：
drivers/video/fbdev/smscufx.c in the Linux kernel through 5.19.12 has a race condition and resultant use-after-free if a physically proximate attacker removes a USB device while calling open(), aka a race condition between ufx_ops_open and ufx_usb_disconnect.

openEuler评分:(评分和向量)
4.2
CVSS：3.0/AV:P/AC:H/PR:N/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-22.03-LTS(5.10.0):受影响
2.openEuler-20.03-LTS-SP1(4.19.90):受影响
3.openEuler-20.03-LTS-SP3(4.19.194):受影响
4.openEuler-22.09:受影响

修复是否涉及abi变化(是/否)：
1.openEuler-22.03-LTS(5.10.0):否
2.openEuler-20.03-LTS-SP1(4.19.90):否
3.openEuler-20.03-LTS-SP3(4.19.194):否
4.openEuler-22.09:否

@Xie XiuQi 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	drivers/video/fbdev/smscufx.c in the Linux kernel through 5.19.12 has a race condition and resultant use-after-free if a physically proximate attacker removes a USB device while calling open(), aka a race condition between ufx_ops_open and ufx_usb_disconnect.
已分析	2.openEulerScore	4.2
已分析	2.openEulerVector	AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
已分析	3.受影响版本排查	openEuler-22.03-LTS:受影响,openEuler-20.03-LTS-SP1:受影响,openEuler-20.03-LTS-SP3:受影响,openEuler-22.09:受影响
已分析	4.修复是否涉及abi变化	openEuler-22.03-LTS:否,openEuler-20.03-LTS-SP1:否,openEuler-20.03-LTS-SP3:否,openEuler-22.09: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.

影响和风险：
如果在调用open()时物理攻击者接近拔掉USB设备，则会发生use-after-free，导致系统不可用。

利用条件：
攻击者能够接近拔掉USB设备。

技术原因：
ufx_usb_disconnect() 中 ufx_data 被释放，ufx_ops_open() 继续使用。

判断方法：
CONFIG依赖： CONFIG_FB_SMSCUFX=n 则不涉及。

ufx_usb_probe
  dev = kzalloc
  kref_init(&dev->kref) // 引用计数设为1
  kref_get(&dev->kref) // 引用计数增加为2

ufx_usb_disconnect
  mutex_lock(&disconnect_mutex) // 在这加锁没用，还是不能防止 dev 释放后继续在 ufx_ops_open 中被访问
  dev->virtualized = true
  schedule_delayed_work(&dev->free_framebuffer_work, 0) // 触发执行到 ufx_free_framebuffer_work, 引用计数减少为1
  kref_put(&dev->kref, ufx_free) // 引用计数减为0
    ufx_free
      kfree(dev) // 释放 ufx_data

ufx_free_framebuffer_work // 由 ufx_usb_disconnect 触发
  kref_put(&dev->kref, ufx_free) // 引用计数减少为1

open
  ...
  ufx_ops_open
  struct ufx_data dev = info->par
  mutex_lock(&disconnect_mutex) // 在这个地方加锁没用，还是不能防止 dev 在 ufx_usb_disconnect 中被释放

已经和补丁作者确认，补丁5610bcfe8693 fbdev: smscufx: Fix use-after-free in ufx_ops_open()不能解决问题，只能降低问题发生的概率：
https://lore.kernel.org/all/20221011153436.GA4446@ubuntu/

@成坚 (CHENG Jian) ,@Xie XiuQi ,@YangYingliang ,@pi3orama ,@jiaoff ,@zhengzengkai
关闭issue前,需要将受影响的分支在合并pr时关联上当前issue编号: #I5U1NZ:CVE-2022-41849
受影响分支: openEuler-20.03-LTS-SP1/openEuler-20.03-LTS-SP3
具体操作参考: https://gitee.com/help/articles/4142

@成坚 (CHENG Jian) ,@Xie XiuQi ,@YangYingliang ,@pi3orama ,@jiaoff ,@Qiuuuuu
关闭issue前,需要将受影响的分支在合并pr时关联上当前issue编号: #I5U1NZ:CVE-2022-41849
受影响分支: openEuler-20.03-LTS-SP3
具体操作参考: https://gitee.com/help/articles/4142

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