CVE-2025-21887
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- CVE-2025-21887
CVE Details
| Release Date: | 2025-03-27 | |
| Impact: | Moderate | What is this? |
Description
In the Linux kernel, the following vulnerability has been resolved:
ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up
The issue was caused by dput(upper) being called before
ovl_dentry_update_reval(), while upper->d_flags was still
accessed in ovl_dentry_remote().
Move dput(upper) after its last use to prevent use-after-free.
BUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]
BUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167
Call Trace:
See more information about CVE-2025-21887 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 metrics
| Base Score: | 7.1 |
| Vector String: | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| Version: | 3.1 |
| Attack Vector: | Local |
| Attack Complexity: | Low |
| Privileges Required: | Low |
| User Interaction: | None |
| Scope: | Unchanged |
| Confidentiality Impact: | High |
| Integrity Impact: | None |
| Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 10 (kernel) | ELSA-2025-9079 | 2025-07-03 |
| Oracle Linux version 10 (kernel-uek) | ELSA-2025-20480 | 2025-07-17 |
| Oracle Linux version 10 (kernel-uek) | ELSA-2025-20530 | 2025-08-18 |
| Oracle Linux version 9 (kernel) | ELSA-2025-10379 | 2025-07-07 |
| Oracle Linux version 9 (kernel-uek) | ELSA-2025-20480 | 2025-07-17 |
| Oracle Linux version 9 (kernel-uek) | ELSA-2025-20530 | 2025-08-18 |
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