BELL-CVE-2025-21879

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CVE-2025-21879

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free on inode when scanning root during em shrinking At btrfsscanroot we are accessing the inode's root and fsinfo in a call to btrfsfsclosing after we have scheduled the inode for a delayed iput, and that ca...

CVE-2025-21879

CVE-2025-21879 describes a Linux kernel use-after-free in the btrfs code. In btrfs_scan_root(), the kernel could dereference inode->root->fs_info after scheduling the inode for delayed iput, if the cleaner kthread ran iput first, leading to a use-after-free of the inode and potential crash....