Updated: 2025-02-14 01:07:49.965596
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]
Links | NIST | CIRCL | RHEL | Ubuntu |
Severity | Score | |
---|---|---|
CVSS Version 2.x | 0 | |
CVSS Version 3.x | HIGH | 7.8 |
OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
---|---|---|---|---|---|---|---|---|
AlmaLinux 9.2 ESU | kernel | 5.14.0 | 7.8 | HIGH | Needs Triage | 2025-01-26 00:02:12 | ||
AlmaLinux 9.2 FIPS | kernel | 5.14.0 | 7.8 | HIGH | Not Vulnerable | 2025-02-14 02:42:46 | ||
CentOS 8.4 ELS | kernel | 4.18.0 | 7.8 | HIGH | Needs Triage | 2025-01-26 00:02:14 | ||
CentOS 8.5 ELS | kernel | 4.18.0 | 7.8 | HIGH | Needs Triage | 2025-01-26 00:02:13 | ||
CentOS Stream 8 ELS | kernel | 4.18.0 | 7.8 | HIGH | Not Vulnerable | 2025-02-19 06:49:46 | ||
Ubuntu 16.04 ELS | linux-hwe | 4.15.0 | 7.8 | HIGH | Released | CLSA-2025:1738696174 | 2025-02-05 02:14:47 | |
Ubuntu 18.04 ELS | linux | 4.15.0 | 7.8 | HIGH | Released | CLSA-2025:1738852812 | 2025-02-07 06:35:21 |