CVE-2021-47493
kernel: ocfs2: fix race between searching chunks and release journal_head from buffer_head
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 22, 2024
Updated · October 20, 2026
Description
A flaw was found in the Linux kernel ocfs2 filesystem. A race between ocfs2_test_bg_bit_allocatable() and jbd2_journal_put_journal_head() can release a journal head while a block-group search is still using it. A local user of an ocfs2 volume can crash the kernel.
Statement
Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')