# CVE-2024-57892: ocfs2: fix slab-use-after-free due to dangling pointer dqi\_priv

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-01-15 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.6

## 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. [akpm@linux-foundation.org: coding-style cleanups]

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/58f9e20e2a7602e1dd649a1ec4790077c251cb6c
- https://git.kernel.org/stable/c/8ff6f635a08c30559ded0c110c7ce03ba7747d11
- https://git.kernel.org/stable/c/f44e6d70c100614c211703f065cad448050e4a0e
- https://git.kernel.org/stable/c/2d431192486367eee03cc28d0b53b97dafcb8e63
- https://git.kernel.org/stable/c/2e3d203b1adede46bbba049e497765d67865be18
- https://git.kernel.org/stable/c/ba950a02d8d23811aa1120affd3adedcfac6153d
- https://git.kernel.org/stable/c/5f3fd772d152229d94602bca243fbb658068a597

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