Bugzilla – Bug 1225149
VUL-0: CVE-2021-47342: kernel: ext4: fix possible UAF when remounting r/o a mmp-protected file system
Last modified: 2024-06-14 11:31:20 UTC
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
I've added the blacklist entry to SLE12-SP5. Nothing to be backported here so reassigning back to security team.
fixed