CVE-2025-21879

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

27/03/2025

Last modified:

06/07/2025

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free on inode when scanning root during em shrinking At btrfs_scan_root() we are accessing the inode&#39;s root (and fs_info) in a call to btrfs_fs_closing() after we have scheduled the inode for a delayed iput, and that can result in a use-after-free on the inode in case the cleaner kthread does the iput before we dereference the inode in the call to btrfs_fs_closing(). Fix this by using the fs_info stored already in a local variable instead of doing inode->root->fs_info.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	6.13 (including)	6.13.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::
cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::
cpe:2.3:o:linux:linux_kernel:6.14:rc3::::::
cpe:2.3:o:linux:linux_kernel:6.14:rc4::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-21879

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools