CVE-2021-47342

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Source
https://cve.org/CVERecord?id=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
2024-05-21T15:15:20.923Z
Modified
2026-03-15T22:43:10.952642Z
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

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "fixed": "5.10.77"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.13.3"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47342.json"