CVE-2021-47321

一、漏洞信息
漏洞编号：CVE-2021-47321
漏洞归属组件：kernel
漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
CVSS V2.0分值：
BaseScore：0.0 None
Vector：CVSS：2.0/
漏洞简述：
In the Linux kernel, the following vulnerability has been resolved:watchdog: Fix possible use-after-free by calling del_timer_sync()This driver s remove path calls del_timer(). However, that functiondoes not wait until the timer handler finishes. This means that thetimer handler may still be running after the driver s remove functionhas finished, which would result in a use-after-free.Fix by calling del_timer_sync(), which makes sure the timer handlerhas finished, and unable to re-schedule itself.
漏洞公开时间：2024-05-21 23:15:19
漏洞创建时间：2024-05-23 14:37:22
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2021-47321

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/1a053c4d716898a53c2e31c574a70ea0c37044a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47321	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47321.mbox	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf	https://bugzilla.suse.com/show_bug.cgi?id=1225060
suse_bugzilla	https://www.cve.org/CVERecord?id=CVE-2021-47321	https://bugzilla.suse.com/show_bug.cgi?id=1225060
redhat_bugzilla	https://lore.kernel.org/linux-cve-announce/2024052132-CVE-2021-47321-1b9b@gregkh/T	https://bugzilla.redhat.com/show_bug.cgi?id=2282440
ubuntu	https://www.cve.org/CVERecord?id=CVE-2021-47321	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/linus/d0212f095ab56672f6f36aabc605bda205e1e0bf (5.14-rc1)	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://nvd.nist.gov/vuln/detail/CVE-2021-47321	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://launchpad.net/bugs/cve/CVE-2021-47321	https://ubuntu.com/security/CVE-2021-47321
ubuntu	https://security-tracker.debian.org/tracker/CVE-2021-47321	https://ubuntu.com/security/CVE-2021-47321

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
linux		https://git.kernel.org/linus/d0212f095ab56672f6f36aabc605bda205e1e0bf	https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2	ubuntu

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:watchdog: Fix possible use-after-free by calling del_timer_sync()This driver s remove path calls del_timer(). However, that functiondoes not wait until the timer handler finishes. This means that thetimer handler may still be running after the driver s remove functionhas finished, which would result in a use-after-free.Fix by calling del_timer_sync(), which makes sure the timer handlerhas finished, and unable to re-schedule itself.
openEuler评分：
6.4
Vector：CVSS：3.0/AV:L/AC:H/PR:H/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(4.19.90):受影响
2.openEuler-22.03-LTS-SP1(5.10.0):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.master(6.1.0):不受影响
6.openEuler-24.03-LTS(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(6.1.0):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

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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-SP1(4.19.90):
3.openEuler-20.03-LTS-SP4(4.19.90):
4.openEuler-22.03-LTS(5.10.0):
5.openEuler-22.03-LTS-Next(5.10.0):
6.openEuler-22.03-LTS-SP1(5.10.0):
7.openEuler-22.03-LTS-SP2(5.10.0):
8.openEuler-22.03-LTS-SP3(5.10.0):
9.openEuler-22.03-LTS-SP4:
10.openEuler-24.03-LTS:
11.openEuler-24.03-LTS-Next:

修复是否涉及abi变化(是/否)：
1.master(6.1.0):
2.openEuler-20.03-LTS-SP1(4.19.90):
3.openEuler-20.03-LTS-SP4(4.19.90):
4.openEuler-22.03-LTS(5.10.0):
5.openEuler-22.03-LTS-Next(5.10.0):
6.openEuler-22.03-LTS-SP1(5.10.0):
7.openEuler-22.03-LTS-SP2(5.10.0):
8.openEuler-22.03-LTS-SP3(5.10.0):
9.openEuler-22.03-LTS-SP4:
10.openEuler-24.03-LTS:
11.openEuler-24.03-LTS-Next:

-----------------------------------------------------------------------
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-2021-47321	None	None	https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3
https://ubuntu.com/security/CVE-2021-47321	None	None	https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 https://discourse.ubuntu.com/c/ubuntu-pro https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 https://git.kernel.org/linus/d0212f095ab56672f6f36aabc605bda205e1e0bf
https://www.opencve.io/cve/CVE-2021-47321	None	None	https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2021-47321
https://security-tracker.debian.org/tracker/CVE-2021-47321	None	None	https://git.kernel.org/linus/d0212f095ab56672f6f36aabc605bda205e1e0bf

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-2021-47321

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

watchdog: Fix possible use-after-free by calling del_timer_sync()

This driver's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.

openEuler评分:(评分和向量)
6.4
CVSS: 3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N

受影响版本排查(受影响/不受影响):
1.openEuler-20.03-LTS-SP1:受影响
2.openEuler-20.03-LTS-SP4:受影响
3.openEuler-22.03-LTS:不受影响
4.openEuler-22.03-LTS-SP1:不受影响
5.openEuler-22.03-LTS-SP2:不受影响
6.openEuler-22.03-LTS-SP3:不受影响
7.openEuler-22.03-LTS-SP4:不受影响
8.master(6.1.0):不受影响
9.openEuler-22.03-LTS-Next:不受影响
10.openEuler-24.03-LTS:不受影响
11.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-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS:否
4.openEuler-22.03-LTS-SP1:否
5.openEuler-22.03-LTS-SP2:否
6.openEuler-22.03-LTS-SP3:否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next:否
9.openEuler-24.03-LTS:否
10.openEuler-24.03-LTS-Next:否
11.openEuler-22.03-LTS-SP4:否

@sanglipeng 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:watchdog: Fix possible use-after-free by calling del_timer_sync()This driver's remove path calls del_timer(). However, that functiondoes not wait until the timer handler finishes. This means that thetimer handler may still be running after the driver's remove functionhas finished, which would result in a use-after-free.Fix by calling del_timer_sync(), which makes sure the timer handlerhas finished, and unable to re-schedule itself.|
|已分析|2.openEulerScore|6.4|
|已分析|3.openEulerVector|AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N|
|已分析|4.受影响版本排查|openEuler-20.03-LTS-SP1:受影响,openEuler-20.03-LTS-SP4:受影响,openEuler-22.03-LTS:不受影响,openEuler-22.03-LTS-SP1:不受影响,openEuler-22.03-LTS-SP2: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-22.03-LTS-Next: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-SP1:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS:否,openEuler-22.03-LTS-SP1:否,openEuler-22.03-LTS-SP2:否,openEuler-22.03-LTS-SP3:否,master:否,openEuler-22.03-LTS-Next: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.**