💣Exploit CVE-2024-57892 - Linux Kernel Ocfs2 Slab-Use-After-Free Vulnerability

[Maksim]

CVE ID : CVE-2024-57892
Published : Jan. 15, 2025, 1:15 p.m. | 33 minutes ago
Description : 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]
Severity: 0.0 | NA
Visit the link for more details, such as CVSS details, affected products, timeline, and more...
Full story here:

To view the content, you need to Sign In or Register.