PT-2025-3617 · Linux+7 · Linux Kernel+7
Published
2024-12-30
·
Updated
2025-10-03
·
CVE-2024-57892
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.6.74
Description
A slab-use-after-free issue occurs in the Linux kernel when mounting ocfs2 and then remounting it as read-only. This happens after the user uses a syscall to
quota getnextquota. The issue is caused by a dangling pointer dqi priv in sb dqinfo(sb, type). During the remounting process, the pointer dqi priv is freed but not set to null, allowing it to be accessed. The read-only option for remounting sets the DQUOT SUSPENDED flag instead of the DQUOT USAGE ENABLED flags. Later, in the process of getting the next quota, the function ocfs2 get next id is called, which only checks the quota usage flags and not the quota suspended flags.Recommendations
To resolve this issue, update to Linux kernel version 6.6.74 or later. As a temporary workaround, consider disabling the
ocfs2 filesystem until a patch is available. Restrict access to the quota getnextquota syscall to minimize the risk of exploitation. Avoid using the dqi priv pointer in the affected code until the issue is resolved.Exploit
Fix
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu