PT-2024-8947 · Linux+3 · Linux Kernel+3
Gautham Ananthakrishna
·
Published
2024-05-22
·
Updated
2025-09-24
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CVE-2021-47493
CVSS v2.0
6.8
Medium
| Vector | AV:L/AC:L/Au:S/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions:
Linux kernel (affected versions not specified)
Description:
The issue is related to a race condition between the
ocfs2 test bg bit allocatable() and jbd2 journal put journal head() functions in the Linux kernel's ocfs2 component. This race condition can lead to a situation where the bg bh->b private becomes NULL, causing a panic. The problem arises when ocfs2 test bg bit allocatable() calls bh2jh(bg bh) and jbd2 journal put journal head() releases the journal head from the buffer head simultaneously. To fix this, a bit lock for the BH JournalHead bit is required.Recommendations:
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Race Condition
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Red Os
Suse