{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47342","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.979Z","datePublished":"2024-05-21T14:35:49.643Z","dateUpdated":"2025-06-19T12:56:02.753Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-06-19T12:56:02.753Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix possible UAF when remounting r/o a mmp-protected file system\n\nAfter commit 618f003199c6 (\"ext4: fix memory leak in\next4_fill_super\"), after the file system is remounted read-only, there\nis a race where the kmmpd thread can exit, causing sbi->s_mmp_tsk to\npoint at freed memory, which the call to ext4_stop_mmpd() can trip\nover.\n\nFix this by only allowing kmmpd() to exit when it is stopped via\next4_stop_mmpd().\n\nBug-Report-Link: <20210629143603.2166962-1-yebin10@huawei.com>"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mmp.c","fs/ext4/super.c"],"versions":[{"version":"5e4f5138bd8522ebe231a137682d3857209a2c07","lessThan":"b663890d854403e566169f7e90aed5cd6ff64f6b","status":"affected","versionType":"git"},{"version":"eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833","lessThan":"7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd","status":"affected","versionType":"git"},{"version":"618f003199c6188e01472b03cdbba227f1dc5f24","lessThan":"61bb4a1c417e5b95d9edb4f887f131de32e419cb","status":"affected","versionType":"git"},{"version":"cecfdb9cf9a700d1037066173abac0617f6788df","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mmp.c","fs/ext4/super.c"],"versions":[{"version":"5.10.51","lessThan":"5.10.77","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.51","versionEndExcluding":"5.10.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b663890d854403e566169f7e90aed5cd6ff64f6b"},{"url":"https://git.kernel.org/stable/c/7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd"},{"url":"https://git.kernel.org/stable/c/61bb4a1c417e5b95d9edb4f887f131de32e419cb"}],"title":"ext4: fix possible UAF when remounting r/o a mmp-protected file system","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47342","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-28T18:31:24.504163Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:15:04.055Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:08.518Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/b663890d854403e566169f7e90aed5cd6ff64f6b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/61bb4a1c417e5b95d9edb4f887f131de32e419cb","tags":["x_transferred"]}]}]}}