| Summary: |
VUL-0: CVE-2021-47342: kernel: ext4: fix possible UAF when remounting r/o a mmp-protected file system |
| Product: |
[Novell Products] SUSE Security Incidents
|
Reporter: |
SMASH SMASH <smash_bz> |
| Component: |
Incidents | Assignee: |
Security Team bot <security-team> |
| Status: |
RESOLVED
UPSTREAM
|
QA Contact: |
Security Team bot <security-team> |
| Severity: |
Major
|
|
|
| Priority: |
P2 - High
|
CC: |
andrea.mattiazzo, ddiss, gabriel.bertazi, meissner, mkoutny, vasant.karasulli
|
| Version: |
unspecified | |
|
| Target Milestone: |
--- | |
|
| Hardware: |
Other | |
|
| OS: |
Other | |
|
| URL: |
https://smash.suse.de/issue/406943/
|
| Whiteboard: |
CVSSv3.1:SUSE:CVE-2021-47342:7.0:(AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) |
|
Found By:
|
Security Response Team
|
Services Priority:
|
|
|---|
|
Business Priority:
|
|
Blocker:
|
---
|
|---|
|
Marketing QA Status:
|
---
|
IT Deployment:
|
---
|
|---|
| Bug Depends on: |
|
|
|
| Bug Blocks: |
1225154
|
|
|
In the Linux kernel, the following vulnerability has been resolved: ext4: fix possible UAF when remounting r/o a mmp-protected file system After commit 618f003199c6 ("ext4: fix memory leak in ext4_fill_super"), after the file system is remounted read-only, there is a race where the kmmpd thread can exit, causing sbi->s_mmp_tsk to point at freed memory, which the call to ext4_stop_mmpd() can trip over. Fix this by only allowing kmmpd() to exit when it is stopped via ext4_stop_mmpd(). Bug-Report-Link: <20210629143603.2166962-1-yebin10@huawei.com> References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47342 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47342.mbox https://git.kernel.org/stable/c/b663890d854403e566169f7e90aed5cd6ff64f6b https://git.kernel.org/stable/c/7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd https://git.kernel.org/stable/c/61bb4a1c417e5b95d9edb4f887f131de32e419cb https://www.cve.org/CVERecord?id=CVE-2021-47342 https://bugzilla.redhat.com/show_bug.cgi?id=2282417