CVE-2021-47342
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47342
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47342.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47342
- Downstream
- Published
- 2024-05-21T15:15:20Z
- Modified
- 2025-08-09T19:01:27Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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 ext4fillsuper"), after the file system is remounted read-only, there is a race where the kmmpd thread can exit, causing sbi->smmptsk to point at freed memory, which the call to ext4stopmmpd() can trip over.
Fix this by only allowing kmmpd() to exit when it is stopped via ext4stopmmpd().
Bug-Report-Link: 20210629143603.2166962-1-yebin10@huawei.com
- References