Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.13, < 6.13.6 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/07836bc18f4ae42da4e922244f4685561c18755e
- https://git.kernel.org/stable/c/59f37036bb7ab3d554c24abc856aabca01126414Patch
- https://git.kernel.org/stable/c/5e79d26014f9386387575b9ed60d342057cee49bPatch
FAQ
What is CVE-2025-21879?
CVE-2025-21879 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 (...
How severe is CVE-2025-21879?
CVE-2025-21879 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-21879?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.