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'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.
History

Wed, 02 Apr 2025 02:15:00 +0000


Tue, 01 Apr 2025 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

Fri, 28 Mar 2025 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 27 Mar 2025 15:15:00 +0000

Type Values Removed Values Added
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'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.
Title btrfs: fix use-after-free on inode when scanning root during em shrinking
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-03-27T14:57:08.929Z

Updated: 2025-05-04T07:23:11.623Z

Reserved: 2024-12-29T08:45:45.782Z

Link: CVE-2025-21879

cve-icon Vulnrichment

Updated: 2025-03-28T15:22:50.414Z

cve-icon NVD

Status : Analyzed

Published: 2025-03-27T15:15:55.790

Modified: 2025-04-01T15:44:57.750

Link: CVE-2025-21879

cve-icon Redhat

Severity : Low

Publid Date: 2025-03-27T00:00:00Z

Links: CVE-2025-21879 - Bugzilla