CVE-2025-21879

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfef55c4d9c9c22264d2b2ceae1e26922cb6129a5 < 07836bc18f4ae42da4e922244f4685561c18755eaffected
LinuxLinux1020443840569535f6025a855958f07ea3eebf71 < 5e79d26014f9386387575b9ed60d342057cee49baffected
LinuxLinux1020443840569535f6025a855958f07ea3eebf71 < 59f37036bb7ab3d554c24abc856aabca01126414affected
LinuxLinux6.13affected
LinuxLinux0 < 6.13unaffected
LinuxLinux6.13.6 <= 6.13.*unaffected
LinuxLinux6.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References