In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix slab-use-after-free due to dangling pointer dqi_priv
When mounting ocfs2 and then remounting it as read-only, a
slab-use-after-free occurs after the user uses a syscall to
quota_getnextquota. Specifically, sb_dqinfo(sb, type)->dqi_priv is the
dangling pointer.
During the remounting process, the pointer dqi_priv is freed but is never
set as null leaving it to be accessed. Additionally, the read-only option
for remounting sets the DQUOT_SUSPENDED flag instead of setting the
DQUOT_USAGE_ENABLED flags. Moreover, later in the process of getting the
next quota, the function ocfs2_get_next_id is called and only checks the
quota usage flags and not the quota suspended flags.
To fix this, I set dqi_priv to null when it is freed after remounting with
read-only and put a check for DQUOT_SUSPENDED in ocfs2_get_next_id.
[[email protected]: coding-style cleanups]
References
Configurations
Configuration 1 (hide)
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History
03 Nov 2025, 21:18
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Information
Published : 2025-01-15 13:15
Updated : 2025-11-03 21:18
NVD link : CVE-2024-57892
Mitre link : CVE-2024-57892
CVE.ORG link : CVE-2024-57892
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free