{"id":"DEBIAN-CVE-2021-47342","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 ext4_fill_super\"), after the file system is remounted read-only, there is a race where the kmmpd thread can exit, causing sbi-\u003es_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: \u003c20210629143603.2166962-1-yebin10@huawei.com\u003e","modified":"2026-09-15T09:02:31.499004891Z","published":"2024-05-21T15:15:20.923Z","upstream":["CVE-2021-47342"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47342"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47342.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47342.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47342.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}