CVE-2021-47433

Summary

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix abort logic in btrfs_replace_file_extents

Error injection testing uncovered a case where we'd end up with a corrupt file system with a missing extent in the middle of a file. This occurs because the if statement to decide if we should abort is wrong.

The only way we would abort in this case is if we got a ret != -EOPNOTSUPP and we called from the file clone code. However the prealloc code uses this path too. Instead we need to abort if there is an error, and the only error we don't abort on is -EOPNOTSUPP and only if we came from the clone file code.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8fccebfa534c7984864394fa03608305e4929aae < 0e32a2b85c7d92ece86c17dfef390c5ed79c6378affected
LinuxLinux8fccebfa534c7984864394fa03608305e4929aae < 0e309e1152fc34ef75991d9d69b165dbf75bf26caffected
LinuxLinux8fccebfa534c7984864394fa03608305e4929aae < 4afb912f439c4bc4e6a4f3e7547f2e69e354108faffected
LinuxLinux5.10affected
LinuxLinux0 < 5.10unaffected
LinuxLinux5.10.75 <= 5.10.*unaffected
LinuxLinux5.14.14 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References