CVE-2021-47641

一、漏洞信息
漏洞编号：CVE-2021-47641
漏洞归属组件：kernel
漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.1.8,6.4.0,6.6.0
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:video: fbdev: cirrusfb: check pixclock to avoid divide by zeroDo a sanity check on pixclock value to avoid divide by zero.If the pixclock value is zero, the cirrusfb driver will round uppixclock to get the derived frequency as close to maxclock aspossible.Syzkaller reported a divide error in cirrusfb_check_pixclock.divide error: 0000 [#1] SMP KASAN PTICPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2RIP: 0010:cirrusfb_check_var+0x6f1/0x1260Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
漏洞公开时间：2025-02-26 14:37:05
漏洞创建时间：2025-02-26 18:06:17
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2021-47641

更多参考(点击展开)

参考来源	参考链接	来源链接
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47641	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47641.mbox	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf	https://bugzilla.suse.com/show_bug.cgi?id=1237734
suse_bugzilla	https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379	https://bugzilla.suse.com/show_bug.cgi?id=1237734

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)

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/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135		nvd
		https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd		nvd
		https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99		nvd
		https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d		nvd
		https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379		nvd
		https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1		nvd
		https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d		nvd
		https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261		nvd
		https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf		nvd

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:video: fbdev: cirrusfb: check pixclock to avoid divide by zeroDo a sanity check on pixclock value to avoid divide by zero.If the pixclock value is zero, the cirrusfb driver will round uppixclock to get the derived frequency as close to maxclock aspossible.Syzkaller reported a divide error in cirrusfb_check_pixclock.divide error: 0000 [#1] SMP KASAN PTICPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2RIP: 0010:cirrusfb_check_var+0x6f1/0x1260Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
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):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
8.openEuler-24.03-LTS-SP2(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
8.openEuler-24.03-LTS-SP2(6.6.0):否

原因说明：
1.openEuler-20.03-LTS-SP4(4.19.90):正常修复
2.master(6.6.0):不受影响-漏洞代码不能被攻击者触发
3.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
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
8.openEuler-24.03-LTS-SP2(6.6.0):不受影响-漏洞代码不存在

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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;
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), 原因说明)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:
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3:
4.openEuler-22.03-LTS-SP4:
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):

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

原因说明：
1.master:
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3:
4.openEuler-22.03-LTS-SP4:
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):

原因说明填写请参考下方表格(注意：版本是否受影响和版本的原因说明必须对应，例如master版本分支受影响，那原因说明只能是受影响对应的原因之一!)：

分支状态	原因说明
受影响	正常修复
受影响	暂不修复-漏洞仍在分析中
受影响	暂不修复-暂无解决方案或补丁
受影响	暂不修复-待升级版本修复
受影响	不修复-超出修复范围
受影响	不修复-特殊原因导致不再修复
不受影响	不受影响-组件不存在
不受影响	不受影响-已有内置的内联控制或缓解措施
不受影响	不受影响-漏洞代码不能被攻击者触发
不受影响	不受影响-漏洞代码不在执行路径
不受影响	不受影响-漏洞代码不存在

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-2021-47641
https://ubuntu.com/security/CVE-2021-47641
https://www.opencve.io/cve/CVE-2021-47641
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2021-47641
https://security-tracker.debian.org/tracker/CVE-2021-47641	None	None	https://git.kernel.org/linus/5c6f402bdcf9e7239c6bc7087eda71ac99b31379
http://www.cnnvd.org.cn/web/vulnerability/queryLds.tag?qcvCnnvdid=CVE-2021-47641

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-2021-47641

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

video: fbdev: cirrusfb: check pixclock to avoid divide by zero

Do a sanity check on pixclock value to avoid divide by zero.

If the pixclock value is zero, the cirrusfb driver will round up
pixclock to get the derived frequency as close to maxclock as
possible.

Syzkaller reported a divide error in cirrusfb_check_pixclock.

divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2
RIP: 0010:cirrusfb_check_var+0x6f1/0x1260

Call Trace:
fb_set_var+0x398/0xf90
do_fb_ioctl+0x4b8/0x6f0
fb_ioctl+0xeb/0x130
__x64_sys_ioctl+0x19d/0x220
do_syscall_64+0x3a/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae

openEuler评分:(评分和向量)
5.5
CVSS:3.1/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:受影响
2.openEuler-22.03-LTS-SP3:不受影响
3.openEuler-22.03-LTS-SP4:不受影响
4.master(6.6.0):不受影响
5.openEuler-24.03-LTS:不受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:不受影响

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

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP4:否
2.openEuler-22.03-LTS-SP3:否
3.master(23.08.5):否
4.openEuler-24.03-LTS:否
5.openEuler-24.03-LTS-Next:否
6.openEuler-22.03-LTS-SP4:否
7.openEuler-24.03-LTS-SP1:否

===========================================================

@sanglipeng 经过 cve-manager 解析, 已分析的内容如下表所示:

状态	分析项目	内容
已分析	1.影响性分析说明	In the Linux kernel, the following vulnerability has been resolved:video: fbdev: cirrusfb: check pixclock to avoid divide by zeroDo a sanity check on pixclock value to avoid divide by zero.If the pixclock value is zero, the cirrusfb driver will round uppixclock to get the derived frequency as close to maxclock aspossible.Syzkaller reported a divide error in cirrusfb_check_pixclock.divide error: 0000 [#1] SMP KASAN PTICPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2RIP: 0010:cirrusfb_check_var+0x6f1/0x1260Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
已分析	2.openEulerScore	5.5
已分析	3.openEulerVector	AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
已分析	4.受影响版本排查	openEuler-20.03-LTS-SP4: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,openEuler-24.03-LTS-SP1:不受影响
已分析	5.是否涉及abi变化	openEuler-20.03-LTS-SP4: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,openEuler-24.03-LTS-SP1:否
已分析	6.原因说明	openEuler-20.03-LTS-SP4:正常修复,master:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-22.03-LTS-SP3:不受影响-漏洞代码不存在,openEuler-22.03-LTS-SP4:不受影响-漏洞代码不存在,openEuler-24.03-LTS:不受影响-漏洞代码不存在,openEuler-24.03-LTS-SP1:不受影响-漏洞代码不存在

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.