CVE-2021-47342

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

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>

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

No affected versions have been published.

Timeline

Published
May 21, 2024
Last modified
Jun 17, 2026
NVD status
Analyzed

Related CVEs from 2021

CVE-2021-473435.5In the Linux kernel, the following vulnerability has been resolved: dm btree remove: assign new_root only when removal succeeds remove_rawCVE-2021-473445.5In the Linux kernel, the following vulnerability has been resolved: media: zr364xx: fix memory leak in zr364xx_start_readpipe syzbot reporCVE-2021-473455.5In the Linux kernel, the following vulnerability has been resolved: RDMA/cma: Fix rdma_resolve_route() memory leak Fix a memory leak when CVE-2021-473467.1In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()CVE-2021-473477.8In the Linux kernel, the following vulnerability has been resolved: wl1251: Fix possible buffer overflow in wl1251_cmd_scan Function wl125CVE-2021-473489.1In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid HDCP over-read and corruption Instead of readinCVE-2021-473495.5In the Linux kernel, the following vulnerability has been resolved: mwifiex: bring down link before deleting interface We can deadlock wheCVE-2021-473505.5In the Linux kernel, the following vulnerability has been resolved: powerpc/mm: Fix lockup on kernel exec fault The powerpc kernel is not CVE-2021-473515.5In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix races between xattr_{set|get} and listxattr operations UBIFCVE-2021-473527.8In the Linux kernel, the following vulnerability has been resolved: virtio-net: Add validation for used length This adds validation for usCVE-2021-473535.5In the Linux kernel, the following vulnerability has been resolved: udf: Fix NULL pointer dereference in udf_symlink function In function CVE-2021-473547.1In the Linux kernel, the following vulnerability has been resolved: drm/sched: Avoid data corruptions Wait for all dependencies of a job
CVE-2021-47342: High severity, CVSS 7.8 | Vulnix